diff --git a/.gitignore b/.gitignore
index 5ae20c8..3779002 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,4 +4,5 @@ obj/
 **/obj/
 target/
 **/target/
+/native/cultmath-core/target.meta
 .tools/
diff --git a/CultMath.slnx b/CultMath.slnx
index 9583457..05d1788 100644
--- a/CultMath.slnx
+++ b/CultMath.slnx
@@ -5,4 +5,7 @@
   <Folder Name="/tests/">
     <Project Path="tests/CultMath.Tests/CultMath.Tests.csproj" />
   </Folder>
+  <Folder Name="/tools/">
+    <Project Path="Tools~/CultMath.PlanetaryTileFixture/CultMath.PlanetaryTileFixture.csproj" />
+  </Folder>
 </Solution>
diff --git a/README.md b/README.md
index 29eb115..c60a991 100644
--- a/README.md
+++ b/README.md
@@ -86,6 +86,20 @@ cargo test --manifest-path native/cultmath-core/Cargo.toml
 cargo build --release --manifest-path native/cultmath-core/Cargo.toml
 ```
 
+## Unity compiler
+
+CultMath uses C# 10 record structs and file-scoped namespaces. Unity projects
+must select the compiler's latest language mode with an `Assets/csc.rsp` file:
+
+```text
+-langversion:latest
+```
+
+The package's Unity smoke project verifies this contract against Unity 6. The
+setting is already present in current GameCult Unity clients; it belongs to the
+consumer project because Unity only reads compiler response files from its
+`Assets` root.
+
 ## Shader Tooling
 
 CultMath keeps portable DXC outside git under `.tools/`:
diff --git a/Samples~/PlanetaryViewer/Editor/CultMath.PlanetaryViewer.Editor.asmdef b/Samples~/PlanetaryViewer/Editor/CultMath.PlanetaryViewer.Editor.asmdef
new file mode 100644
index 0000000..1051232
--- /dev/null
+++ b/Samples~/PlanetaryViewer/Editor/CultMath.PlanetaryViewer.Editor.asmdef
@@ -0,0 +1,18 @@
+{
+  "name": "CultMath.PlanetaryViewer.Editor",
+  "rootNamespace": "CultMath.Unity.Samples.Editor",
+  "references": [
+    "CultMath.PlanetaryViewer"
+  ],
+  "includePlatforms": [
+    "Editor"
+  ],
+  "excludePlatforms": [],
+  "allowUnsafeCode": false,
+  "overrideReferences": false,
+  "precompiledReferences": [],
+  "autoReferenced": true,
+  "defineConstraints": [],
+  "versionDefines": [],
+  "noEngineReferences": false
+}
diff --git a/Samples~/PlanetaryViewer/Editor/CultMathPlanetaryViewerMenu.cs b/Samples~/PlanetaryViewer/Editor/CultMathPlanetaryViewerMenu.cs
new file mode 100644
index 0000000..ade28c3
--- /dev/null
+++ b/Samples~/PlanetaryViewer/Editor/CultMathPlanetaryViewerMenu.cs
@@ -0,0 +1,26 @@
+using UnityEditor;
+using UnityEngine;
+
+namespace CultMath.Unity.Samples.Editor;
+
+public static class CultMathPlanetaryViewerMenu
+{
+    [MenuItem("GameObject/CultMath/Planetary Field Viewer", false, 10)]
+    public static void CreateViewer()
+    {
+        var root = new GameObject("CultMath Planetary Field Viewer");
+        Undo.RegisterCreatedObjectUndo(root, "Create CultMath Planetary Viewer");
+        root.AddComponent<CultMathPlanetaryViewer>();
+        Selection.activeGameObject = root;
+
+        if (Camera.main != null) return;
+        var cameraObject = new GameObject("Planetary Viewer Camera");
+        Undo.RegisterCreatedObjectUndo(cameraObject, "Create Planetary Viewer Camera");
+        cameraObject.tag = "MainCamera";
+        cameraObject.transform.position = new Vector3(0, 0, -24);
+        cameraObject.transform.LookAt(root.transform);
+        var camera = cameraObject.AddComponent<Camera>();
+        camera.nearClipPlane = 0.01f;
+        camera.farClipPlane = 1000;
+    }
+}
diff --git a/Samples~/PlanetaryViewer/README.md b/Samples~/PlanetaryViewer/README.md
new file mode 100644
index 0000000..ec4dcc3
--- /dev/null
+++ b/Samples~/PlanetaryViewer/README.md
@@ -0,0 +1,16 @@
+# Planetary Field Viewer
+
+Import this sample through Unity's Package Manager, then choose
+`GameObject > CultMath > Planetary Field Viewer`.
+
+The host project must contain `Assets/csc.rsp` with
+`-langversion:latest`, as documented in the CultMath package README.
+
+The generated six-face mesh uses `PlanetaryPatch`. Its shader calls
+`cultmath_planetary_field_sample` from the packaged CultMath HLSL, while the
+component exposes the matching CPU `Sample` method. Seed, radius, physical
+sample footprint, erosion settings, and base-field equations are shared between
+the two bodies.
+
+This is a renderer integration fixture, not a gameplay owner. It deliberately
+contains no Aetheria state, biomes, resources, or simulation decisions.
diff --git a/Samples~/PlanetaryViewer/Runtime/CultMath.PlanetaryViewer.asmdef b/Samples~/PlanetaryViewer/Runtime/CultMath.PlanetaryViewer.asmdef
new file mode 100644
index 0000000..2d3676f
--- /dev/null
+++ b/Samples~/PlanetaryViewer/Runtime/CultMath.PlanetaryViewer.asmdef
@@ -0,0 +1,17 @@
+{
+  "name": "CultMath.PlanetaryViewer",
+  "rootNamespace": "CultMath.Unity.Samples",
+  "references": [
+    "CultMath",
+    "CultMath.Unity"
+  ],
+  "includePlatforms": [],
+  "excludePlatforms": [],
+  "allowUnsafeCode": false,
+  "overrideReferences": false,
+  "precompiledReferences": [],
+  "autoReferenced": true,
+  "defineConstraints": [],
+  "versionDefines": [],
+  "noEngineReferences": false
+}
diff --git a/Samples~/PlanetaryViewer/Runtime/CultMathPlanetaryViewer.cs b/Samples~/PlanetaryViewer/Runtime/CultMathPlanetaryViewer.cs
new file mode 100644
index 0000000..0611372
--- /dev/null
+++ b/Samples~/PlanetaryViewer/Runtime/CultMathPlanetaryViewer.cs
@@ -0,0 +1,139 @@
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace CultMath.Unity.Samples;
+
+[ExecuteAlways]
+public sealed class CultMathPlanetaryViewer : MonoBehaviour
+{
+    [Min(0.001f)] public float Radius = 8.4f;
+    [Range(1, 256)] public int CellsPerFace = 64;
+    public int Seed = 42;
+    [Min(0.0001f)] public float SampleFootprint = 0.01f;
+    public Shader? PlanetShader;
+    public Vector3 LightDirection = new(-0.4f, 0.7f, -0.6f);
+    public Color LowColor = new(0.055f, 0.16f, 0.09f, 1);
+    public Color HighColor = new(0.62f, 0.48f, 0.28f, 1);
+    public Color RidgeColor = new(0.88f, 0.83f, 0.7f, 1);
+
+    private readonly List<Mesh> meshes = new();
+    private Material? material;
+    private int builtCells;
+
+    public PlanetaryFieldDefinition Definition => PlanetaryFieldDefinition.Create(
+        1,
+        Radius,
+        Seed,
+        ViewerErosion(Radius));
+
+    public PlanetarySurfaceSample Sample(float3 direction)
+    {
+        var source = new ViewerBaseField(Radius);
+        var normalized = math.normalize(direction);
+        return PlanetaryField.Sample(Definition, normalized, source.Sample(normalized), PlanetaryQueryScale.AtFootprint(SampleFootprint));
+    }
+
+    private void OnEnable() => Rebuild();
+
+    private void OnValidate()
+    {
+        Radius = Mathf.Max(Radius, 0.001f);
+        CellsPerFace = Mathf.Clamp(CellsPerFace, 1, 256);
+        SampleFootprint = Mathf.Max(SampleFootprint, 0.0001f);
+        if (isActiveAndEnabled) Rebuild();
+    }
+
+    private void Update()
+    {
+        if (builtCells != CellsPerFace || material == null) Rebuild();
+        ApplyMaterial();
+    }
+
+    private void Rebuild()
+    {
+        ClearGenerated();
+        PlanetShader ??= Shader.Find("CultMath/Planetary Field Viewer");
+        if (PlanetShader == null) return;
+        material = new Material(PlanetShader) { name = "CultMath Planetary Viewer Material", hideFlags = HideFlags.HideAndDontSave };
+        foreach (var face in (PlanetaryCubeFace[])Enum.GetValues(typeof(PlanetaryCubeFace)))
+        {
+            var mesh = PlanetaryPatchMeshAdapter.CreateFaceMesh(face, CellsPerFace);
+            mesh.hideFlags = HideFlags.HideAndDontSave;
+            meshes.Add(mesh);
+            var child = new GameObject(face.ToString()) { hideFlags = HideFlags.DontSave };
+            child.transform.SetParent(transform, false);
+            child.AddComponent<MeshFilter>().sharedMesh = mesh;
+            child.AddComponent<MeshRenderer>().sharedMaterial = material;
+        }
+        builtCells = CellsPerFace;
+        ApplyMaterial();
+    }
+
+    private void ApplyMaterial()
+    {
+        if (material == null) return;
+        var p = ViewerErosion(Radius);
+        material.SetFloat("_Radius", Radius);
+        material.SetFloat("_SampleFootprint", SampleFootprint);
+        material.SetInt("_Seed", Seed);
+        material.SetFloat("_ErosionScale", p.Scale);
+        material.SetFloat("_ErosionStrength", p.Strength);
+        material.SetFloat("_GullyWeight", p.GullyWeight);
+        material.SetFloat("_Detail", p.Detail);
+        material.SetVector("_Rounding", new(p.Rounding.x, p.Rounding.y, p.Rounding.z, p.Rounding.w));
+        material.SetVector("_Onset", new(p.Onset.x, p.Onset.y, p.Onset.z, p.Onset.w));
+        material.SetVector("_AssumedSlope", new(p.AssumedSlope.x, p.AssumedSlope.y, 0, 0));
+        material.SetFloat("_CellScale", p.CellScale);
+        material.SetFloat("_Normalization", p.Normalization);
+        material.SetInt("_Octaves", p.Octaves);
+        material.SetFloat("_Lacunarity", p.Lacunarity);
+        material.SetFloat("_Gain", p.Gain);
+        material.SetVector("_LightDirection", LightDirection.normalized);
+        material.SetColor("_LowColor", LowColor);
+        material.SetColor("_HighColor", HighColor);
+        material.SetColor("_RidgeColor", RidgeColor);
+    }
+
+    private void OnDisable() => ClearGenerated();
+    private void OnDestroy() => ClearGenerated();
+
+    private void ClearGenerated()
+    {
+        for (var i = transform.childCount - 1; i >= 0; i--) DestroyGenerated(transform.GetChild(i).gameObject);
+        foreach (var mesh in meshes) DestroyGenerated(mesh);
+        meshes.Clear();
+        if (material != null) DestroyGenerated(material);
+        material = null;
+        builtCells = 0;
+    }
+
+    private static void DestroyGenerated(UnityEngine.Object value)
+    {
+        if (Application.isPlaying) Destroy(value);
+        else DestroyImmediate(value);
+    }
+
+    private static AdvancedErosionParameters ViewerErosion(float radius) => new(
+        radius * 0.075f, 0.12f, 0.58f, 1.45f,
+        new float4(0.1f, 0.015f, 0.1f, 2),
+        new float4(1.25f, 1.25f, 2.8f, 1.5f),
+        new float2(0.7f, 0.85f), 0.7f, 0.5f, 7, 2, 0.5f);
+
+    private readonly struct ViewerBaseField : IPlanetaryBaseField
+    {
+        private readonly float radius;
+        public ViewerBaseField(float radius) => this.radius = radius;
+
+        public PlanetaryBaseFieldSample Sample(float3 direction)
+        {
+            var value = direction.x * 0.6f + direction.y * direction.z * 0.3f;
+            var angularGradient = new float3(0.6f, direction.z * 0.3f, direction.y * 0.3f);
+            angularGradient -= direction * math.dot(angularGradient, direction);
+            var fieldGradient = angularGradient / radius;
+            var radialDisplacement = value * radius * 0.035f;
+            var radialGradient = angularGradient * 0.035f;
+            return new(radialDisplacement, radialGradient, value, fieldGradient, math.clamp(value, -1, 1));
+        }
+    }
+}
diff --git a/Samples~/PlanetaryViewer/Runtime/CultMathPlanetaryViewer.shader b/Samples~/PlanetaryViewer/Runtime/CultMathPlanetaryViewer.shader
new file mode 100644
index 0000000..b5f7274
--- /dev/null
+++ b/Samples~/PlanetaryViewer/Runtime/CultMathPlanetaryViewer.shader
@@ -0,0 +1,90 @@
+Shader "CultMath/Planetary Field Viewer"
+{
+    Properties
+    {
+        _LowColor ("Low Color", Color) = (0.055, 0.16, 0.09, 1)
+        _HighColor ("High Color", Color) = (0.62, 0.48, 0.28, 1)
+        _RidgeColor ("Ridge Color", Color) = (0.88, 0.83, 0.7, 1)
+    }
+    SubShader
+    {
+        Tags { "RenderType"="Opaque" "Queue"="Geometry" }
+        Pass
+        {
+            Cull Back
+            ZWrite On
+            HLSLPROGRAM
+            #pragma target 5.0
+            #pragma vertex vert
+            #pragma fragment frag
+            #include "UnityCG.cginc"
+            #include "Packages/org.gamecult.cultmath/shaders/CultMath.hlsl"
+
+            float _Radius;
+            float _SampleFootprint;
+            int _Seed;
+            float _ErosionScale, _ErosionStrength, _GullyWeight, _Detail;
+            float4 _Rounding, _Onset, _AssumedSlope;
+            float _CellScale, _Normalization, _Lacunarity, _Gain;
+            int _Octaves;
+            float3 _LightDirection;
+            float4 _LowColor, _HighColor, _RidgeColor;
+
+            struct Attributes { float4 vertex : POSITION; };
+            struct Varyings
+            {
+                float4 position : SV_POSITION;
+                float3 worldNormal : TEXCOORD0;
+                float height : TEXCOORD1;
+                float ridge : TEXCOORD2;
+            };
+
+            CultMathPlanetarySurfaceSample viewer_sample(float3 direction)
+            {
+                direction = normalize(direction);
+                float value = direction.x * 0.6 + direction.y * direction.z * 0.3;
+                float3 angular_gradient = float3(0.6, direction.z * 0.3, direction.y * 0.3);
+                angular_gradient -= direction * dot(angular_gradient, direction);
+                CultMathPlanetaryBaseFieldSample base_sample;
+                base_sample.radial_displacement = value * _Radius * 0.035;
+                base_sample.radial_gradient = angular_gradient * 0.035;
+                base_sample.field_value = value;
+                base_sample.field_gradient = angular_gradient / _Radius;
+                base_sample.fade_target = clamp(value, -1.0, 1.0);
+                CultMathAdvancedErosionParameters erosion;
+                erosion.scale = _ErosionScale; erosion.strength = _ErosionStrength;
+                erosion.gully_weight = _GullyWeight; erosion.detail = _Detail;
+                erosion.rounding = _Rounding; erosion.onset = _Onset;
+                erosion.assumed_slope = _AssumedSlope.xy; erosion.cell_scale = _CellScale;
+                erosion.normalization = _Normalization; erosion.octaves = _Octaves;
+                erosion.lacunarity = _Lacunarity; erosion.gain = _Gain;
+                CultMathPlanetaryFieldDefinition definition;
+                definition.radius = _Radius; definition.seed = _Seed; definition.erosion = erosion;
+                return cultmath_planetary_field_sample(definition, direction, base_sample, _SampleFootprint);
+            }
+
+            Varyings vert(Attributes input)
+            {
+                float3 direction = normalize(input.vertex.xyz);
+                CultMathPlanetarySurfaceSample sample = viewer_sample(direction);
+                float3 local = direction * (_Radius + sample.radial_displacement);
+                Varyings output;
+                output.position = UnityObjectToClipPos(float4(local, 1));
+                output.worldNormal = UnityObjectToWorldNormal(sample.surface_normal);
+                output.height = sample.radial_displacement / max(_Radius * 0.1, 1.0e-5);
+                output.ridge = sample.ridge;
+                return output;
+            }
+
+            float4 frag(Varyings input) : SV_Target
+            {
+                float height = saturate(input.height * 0.5 + 0.5);
+                float3 albedo = lerp(_LowColor.rgb, _HighColor.rgb, height);
+                albedo = lerp(albedo, _RidgeColor.rgb, saturate((input.ridge - 0.55) * 2.5));
+                float diffuse = saturate(dot(normalize(input.worldNormal), normalize(-_LightDirection))) * 0.82 + 0.08;
+                return float4(albedo * diffuse, 1);
+            }
+            ENDHLSL
+        }
+    }
+}
diff --git a/THIRD-PARTY-NOTICES.md.meta b/THIRD-PARTY-NOTICES.md.meta
new file mode 100644
index 0000000..4b43dda
--- /dev/null
+++ b/THIRD-PARTY-NOTICES.md.meta
@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: 7c28c8631c7d4054eb751d7ce952df33
+TextScriptImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Tools~/CultMath.PlanetaryTileFixture/CultMath.PlanetaryTileFixture.csproj b/Tools~/CultMath.PlanetaryTileFixture/CultMath.PlanetaryTileFixture.csproj
new file mode 100644
index 0000000..9a6f8bd
--- /dev/null
+++ b/Tools~/CultMath.PlanetaryTileFixture/CultMath.PlanetaryTileFixture.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\CultMath\CultMath.csproj" />
+  </ItemGroup>
+</Project>
diff --git a/Tools~/CultMath.PlanetaryTileFixture/Program.cs b/Tools~/CultMath.PlanetaryTileFixture/Program.cs
new file mode 100644
index 0000000..1952fa2
--- /dev/null
+++ b/Tools~/CultMath.PlanetaryTileFixture/Program.cs
@@ -0,0 +1,22 @@
+using CultMath;
+
+if (args.Length != 1) throw new ArgumentException("Expected one output path.");
+var field = PlanetaryFieldDefinition.Create(0x55aa, 10, 7, AdvancedErosionParameters.Default);
+var layout = new PlanetaryMapTileLayout(new(PlanetaryProjectionKind.EqualEarth), 0, 0, 0, 5, 1);
+var key = new PlanetaryMapTileKey(field.FieldVersion, 3, 29, layout, PlanetaryQueryScale.AtFootprint(0.25f, 0.125f));
+var tile = PlanetaryMapTileBaker.Bake(field, key, new FixtureField());
+var path = Path.GetFullPath(args[0]);
+Directory.CreateDirectory(Path.GetDirectoryName(path)!);
+using var stream = File.Create(path);
+PlanetaryMapTileEncoding.Write(stream, tile);
+
+readonly struct FixtureField : IPlanetaryBaseField
+{
+    public PlanetaryBaseFieldSample Sample(float3 direction)
+    {
+        var value = direction.x * 0.2f + direction.z * 0.4f;
+        var gradient = new float3(0.2f, 0, 0.4f);
+        gradient -= direction * math.dot(gradient, direction);
+        return new(value, gradient, value, gradient * 0.1f, value);
+    }
+}
diff --git a/docs/planetary.md b/docs/planetary.md
index 8196c1c..3503429 100644
--- a/docs/planetary.md
+++ b/docs/planetary.md
@@ -80,11 +80,17 @@ coarse meshes from the canonical topology. HLSL calls
 Renderers still own cameras, clip space, depth, materials, buffers, dispatch,
 and draw submission.
 
+`PlanetaryGpuPageBuilder` owns the renderer-neutral page input and metadata
+payload. Host adapters may convert its `float4` values to native vector types,
+but do not recalculate directions, spacing, addressing, or transition state.
+
 The optional `CultMath.Unity` assembly converts a canonical face patch into a
-Unity `Mesh` and converts a residency snapshot into Unity-native page input and
-metadata payloads. It owns no field parameters, page selection, or simulation
-state. Unity render code remains responsible for allocating/binding graphics
-buffers and dispatching application-specific base-field entry points.
+Unity `Mesh` and converts the shared GPU payload into Unity-native structs. It
+owns no field parameters, page selection, or simulation state. The package's
+Planetary Field Viewer sample renders the shared HLSL field and reports matching
+CPU queries. Unity render code remains responsible for allocating/binding
+graphics buffers and dispatching application-specific base-field entry points.
+The host Unity project must set `-langversion:latest` in `Assets/csc.rsp`.
 
 ## Maps
 
@@ -103,6 +109,12 @@ projection and canonical field query. `PlanetaryMapTileKey` includes field,
 projection, layer, layout, and query-scale identity. Palettes, contours, labels,
 and strategic overlays do not enter CultMath.
 
+`PlanetaryMapTileEncoding` writes the resulting evidence as a versioned
+little-endian `CMPT` binary asset. `web/planetary-tile.ts` decodes that exact
+format into browser-native values without defining another terrain generator.
+Typed CultMesh documents should carry the tile key and asset reference; the
+binary payload is derived CDN/cache data, not committed game state.
+
 ## Numeric contract
 
 Integer hashes and published field versions are exact. Basic arithmetic follows
@@ -111,7 +123,8 @@ CultMath's matched C#/HLSL semantics. Hardware transcendental functions such as
 Every filtered terrain query carries an unresolved-height bound so consumers can
 reject insufficient fidelity explicitly.
 
-Current D3D12 parity evidence covers the advanced erosion kernel and the QSC
-forward/inverse topology. The remaining production page and patch shaders use
-the common functions and retain their seam, residual, summary, and radial-hit
-integration probes in Fensalir.
+Current D3D12 parity evidence covers the advanced erosion kernel, QSC topology,
+and forward/inverse transforms for every supported map projection, including
+center and scale parameters. Production page and patch shaders use the common
+functions and retain their seam, residual, summary, and radial-hit integration
+probes in Fensalir.
diff --git a/docs/planetary.md.meta b/docs/planetary.md.meta
new file mode 100644
index 0000000..af364c2
--- /dev/null
+++ b/docs/planetary.md.meta
@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: 23a5751e4cececc4e99e024058d69add
+TextScriptImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/package.json b/package.json
index 6da2a17..2564360 100644
--- a/package.json
+++ b/package.json
@@ -10,5 +10,12 @@
     "Simulation"
   ],
   "license": "MPL-2.0",
-  "category": "Scripting"
+  "category": "Scripting",
+  "samples": [
+    {
+      "displayName": "Planetary Field Viewer",
+      "description": "Runnable Unity viewer using the canonical CultMath CPU and HLSL planetary field.",
+      "path": "Samples~/PlanetaryViewer"
+    }
+  ]
 }
diff --git a/scripts.meta b/scripts.meta
new file mode 100644
index 0000000..6f03c56
--- /dev/null
+++ b/scripts.meta
@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 0ddff5b782cf14e43ae5cda048e040d8
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/scripts/test-web-planetary-tile.ps1 b/scripts/test-web-planetary-tile.ps1
new file mode 100644
index 0000000..5221fb3
--- /dev/null
+++ b/scripts/test-web-planetary-tile.ps1
@@ -0,0 +1,9 @@
+$ErrorActionPreference = "Stop"
+$root = Split-Path -Parent $PSScriptRoot
+$fixture = Join-Path $root ".tools\planetary-tile\fixture.cmpt"
+dotnet run --project (Join-Path $root "Tools~\CultMath.PlanetaryTileFixture\CultMath.PlanetaryTileFixture.csproj") -- $fixture
+if ($LASTEXITCODE -ne 0) { throw "Planetary tile fixture generation failed." }
+node --no-warnings --experimental-strip-types (Join-Path $root "web\planetary-tile.cross-runtime.test.mjs") $fixture
+if ($LASTEXITCODE -ne 0) { throw "Planetary tile web decoding failed." }
+node --no-warnings --experimental-strip-types (Join-Path $root "web\planetary-tile.test.mjs")
+if ($LASTEXITCODE -ne 0) { throw "Planetary tile decoder unit test failed." }
diff --git a/scripts/test-web-planetary-tile.ps1.meta b/scripts/test-web-planetary-tile.ps1.meta
new file mode 100644
index 0000000..ffd7323
--- /dev/null
+++ b/scripts/test-web-planetary-tile.ps1.meta
@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: 235e8f203bd1c4d40a8fa211273106ba
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/shaders/AdvancedErosionFilter.hlsl.meta b/shaders/AdvancedErosionFilter.hlsl.meta
new file mode 100644
index 0000000..a354e33
--- /dev/null
+++ b/shaders/AdvancedErosionFilter.hlsl.meta
@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: 3252ac02e8853ef4b9d1fbc5204b5c6b
+ShaderIncludeImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/shaders/Planetary.hlsl b/shaders/Planetary.hlsl
index 729c633..81e312b 100644
--- a/shaders/Planetary.hlsl
+++ b/shaders/Planetary.hlsl
@@ -120,6 +120,138 @@ float3 cultmath_planetary_equal_earth_inverse(float2 coordinate)
     return cultmath_normalize(float3(cos_latitude * cos(longitude), cos_latitude * sin(longitude), sin(latitude)));
 }
 
+float cultmath_planetary_wrap_longitude(float longitude)
+{
+    longitude = fmod(longitude, CULTMATH_TAU);
+    if (longitude > CULTMATH_PI) longitude -= CULTMATH_TAU;
+    if (longitude < -CULTMATH_PI) longitude += CULTMATH_TAU;
+    return longitude;
+}
+
+float3 cultmath_planetary_lon_lat_direction(float longitude, float latitude)
+{
+    float cos_latitude = cos(latitude);
+    return cultmath_normalize(float3(cos_latitude * cos(longitude), cos_latitude * sin(longitude), sin(latitude)));
+}
+
+float cultmath_planetary_asinh(float value) { return log(value + sqrt(value * value + 1.0)); }
+float cultmath_planetary_sinh(float value) { return 0.5 * (exp(value) - exp(-value)); }
+
+bool cultmath_planetary_azimuthal_forward(float3 direction, float2 center_lon_lat, int kind, out float2 coordinate)
+{
+    direction = cultmath_normalize(direction);
+    float longitude = cultmath_planetary_wrap_longitude(atan2(direction.y, direction.x) - center_lon_lat.x);
+    float latitude = asin(clamp(direction.z, -1.0, 1.0));
+    float sin0 = sin(center_lon_lat.y), cos0 = cos(center_lon_lat.y);
+    float sin_latitude = sin(latitude), cos_latitude = cos(latitude), cos_longitude = cos(longitude);
+    float cos_c = clamp(sin0 * sin_latitude + cos0 * cos_latitude * cos_longitude, -1.0, 1.0);
+    float2 raw = float2(cos_latitude * sin(longitude), cos0 * sin_latitude - sin0 * cos_latitude * cos_longitude);
+    float factor = 1.0;
+    if (kind == 3)
+    {
+        if (cos_c < 0.0) { coordinate = 0.0; return false; }
+    }
+    else if (kind == 4)
+    {
+        float c = acos(cos_c); factor = (c < 1.0e-6 ? 1.0 : c / sin(c)) / CULTMATH_PI;
+    }
+    else if (kind == 5) factor = sqrt(2.0 / max(1.0 + cos_c, 1.0e-20)) * 0.5;
+    else
+    {
+        if (cos_c <= 0.0) { coordinate = 0.0; return false; }
+        factor = 1.0 / cos_c;
+    }
+    coordinate = raw * factor;
+    return true;
+}
+
+bool cultmath_planetary_azimuthal_inverse(float2 coordinate, float2 center_lon_lat, int kind, out float3 direction)
+{
+    float rho = length(coordinate);
+    float c;
+    if (kind == 3) { if (rho > 1.0) { direction = 0.0; return false; } c = asin(clamp(rho, 0.0, 1.0)); }
+    else if (kind == 4) { if (rho > 1.0) { direction = 0.0; return false; } c = rho * CULTMATH_PI; }
+    else if (kind == 5) { if (rho > 1.0) { direction = 0.0; return false; } c = 2.0 * asin(clamp(rho, 0.0, 1.0)); }
+    else c = atan(rho);
+    if (rho < 1.0e-6) { direction = cultmath_planetary_lon_lat_direction(center_lon_lat.x, center_lon_lat.y); return true; }
+    float sin_c = sin(c), cos_c = cos(c), sin0 = sin(center_lon_lat.y), cos0 = cos(center_lon_lat.y);
+    float latitude = asin(clamp(cos_c * sin0 + coordinate.y * sin_c * cos0 / rho, -1.0, 1.0));
+    float delta_longitude = atan2(coordinate.x * sin_c, rho * cos0 * cos_c - coordinate.y * sin0 * sin_c);
+    direction = cultmath_planetary_lon_lat_direction(cultmath_planetary_wrap_longitude(delta_longitude + center_lon_lat.x), latitude);
+    return true;
+}
+
+bool cultmath_planetary_cube_atlas_forward(float3 direction, out float2 coordinate)
+{
+    int face;
+    float2 face_coordinate = cultmath_planetary_face_coordinate(direction, face);
+    int column = face % 3;
+    int row = face / 3;
+    coordinate = float2(-1.0 + (column + (face_coordinate.x + 1.0) * 0.5) * (2.0 / 3.0), 1.0 - (row + (face_coordinate.y + 1.0) * 0.5));
+    return true;
+}
+
+bool cultmath_planetary_cube_atlas_inverse(float2 coordinate, out float3 direction)
+{
+    if (any(coordinate < -1.0) || any(coordinate > 1.0)) { direction = 0.0; return false; }
+    int column = min((int)((coordinate.x + 1.0) * 1.5), 2);
+    int row = min((int)(1.0 - coordinate.y), 1);
+    float u = ((coordinate.x + 1.0) * 1.5 - column) * 2.0 - 1.0;
+    float v = ((1.0 - coordinate.y) - row) * 2.0 - 1.0;
+    direction = cultmath_planetary_face_direction(row * 3 + column, float2(u, v));
+    return true;
+}
+
+bool cultmath_planetary_projection_forward(float3 direction, int kind, float3 center_lon_lat_scale, out float2 coordinate)
+{
+    float scale = max(center_lon_lat_scale.z, 1.0e-20);
+    if (kind == 6)
+    {
+        bool valid = cultmath_planetary_cube_atlas_forward(direction, coordinate);
+        coordinate /= scale; return valid;
+    }
+    if (kind >= 3)
+    {
+        bool valid = cultmath_planetary_azimuthal_forward(direction, center_lon_lat_scale.xy, kind, coordinate);
+        coordinate /= scale; return valid;
+    }
+    direction = cultmath_normalize(direction);
+    float longitude = cultmath_planetary_wrap_longitude(atan2(direction.y, direction.x) - center_lon_lat_scale.x);
+    float latitude = asin(clamp(direction.z, -1.0, 1.0));
+    if (kind == 0) coordinate = float2(longitude / CULTMATH_PI, latitude / CULTMATH_HALF_PI);
+    else if (kind == 1)
+    {
+        const float maximum_latitude = 1.4844222297453324;
+        if (abs(latitude) > maximum_latitude) { coordinate = 0.0; return false; }
+        coordinate = float2(longitude / CULTMATH_PI, cultmath_planetary_asinh(tan(latitude)) / CULTMATH_PI);
+    }
+    else
+    {
+        float3 centered = cultmath_planetary_lon_lat_direction(longitude, latitude);
+        coordinate = cultmath_planetary_equal_earth_forward(centered);
+    }
+    coordinate /= scale;
+    return true;
+}
+
+bool cultmath_planetary_projection_inverse(float2 coordinate, int kind, float3 center_lon_lat_scale, out float3 direction)
+{
+    coordinate *= max(center_lon_lat_scale.z, 1.0e-20);
+    if (kind == 6) return cultmath_planetary_cube_atlas_inverse(coordinate, direction);
+    if (kind >= 3) return cultmath_planetary_azimuthal_inverse(coordinate, center_lon_lat_scale.xy, kind, direction);
+    if (any(abs(coordinate) > 1.0)) { direction = 0.0; return false; }
+    float longitude, latitude;
+    if (kind == 0) { longitude = coordinate.x * CULTMATH_PI; latitude = coordinate.y * CULTMATH_HALF_PI; }
+    else if (kind == 1) { longitude = coordinate.x * CULTMATH_PI; latitude = atan(cultmath_planetary_sinh(coordinate.y * CULTMATH_PI)); }
+    else
+    {
+        float3 centered = cultmath_planetary_equal_earth_inverse(coordinate);
+        longitude = atan2(centered.y, centered.x); latitude = asin(clamp(centered.z, -1.0, 1.0));
+    }
+    direction = cultmath_planetary_lon_lat_direction(cultmath_planetary_wrap_longitude(longitude + center_lon_lat_scale.x), latitude);
+    return true;
+}
+
 struct CultMathPlanetaryFieldDefinition
 {
     float radius;
diff --git a/shaders/Planetary.hlsl.meta b/shaders/Planetary.hlsl.meta
new file mode 100644
index 0000000..f777135
--- /dev/null
+++ b/shaders/Planetary.hlsl.meta
@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: bb055ad5328888e479e90ae3fe62c3fe
+ShaderIncludeImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/src/CultMath/AdvancedErosionFilter.cs.meta b/src/CultMath/AdvancedErosionFilter.cs.meta
new file mode 100644
index 0000000..52f7ca1
--- /dev/null
+++ b/src/CultMath/AdvancedErosionFilter.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: bec15fdcbe97a7f44a24bdb3ff79e1e7
\ No newline at end of file
diff --git a/src/CultMath/ErosionFrequencyBands.cs.meta b/src/CultMath/ErosionFrequencyBands.cs.meta
new file mode 100644
index 0000000..cae9964
--- /dev/null
+++ b/src/CultMath/ErosionFrequencyBands.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 05e7969589dd09b43bd0fda672d25a0b
\ No newline at end of file
diff --git a/src/CultMath/PlanetaryField.cs b/src/CultMath/PlanetaryField.cs
index 13f36c0..4d5596e 100644
--- a/src/CultMath/PlanetaryField.cs
+++ b/src/CultMath/PlanetaryField.cs
@@ -1,3 +1,5 @@
+using System;
+
 namespace CultMath;
 
 public readonly record struct PlanetaryQueryScale(float FootprintMeters, float MaximumUnresolvedHeight)
diff --git a/src/CultMath/PlanetaryField.cs.meta b/src/CultMath/PlanetaryField.cs.meta
new file mode 100644
index 0000000..3e83f63
--- /dev/null
+++ b/src/CultMath/PlanetaryField.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: b61d6354e3aab054e94721e77e619bfa
\ No newline at end of file
diff --git a/src/CultMath/PlanetaryGpuPages.cs b/src/CultMath/PlanetaryGpuPages.cs
new file mode 100644
index 0000000..024d26b
--- /dev/null
+++ b/src/CultMath/PlanetaryGpuPages.cs
@@ -0,0 +1,55 @@
+using System;
+
+namespace CultMath;
+
+public readonly record struct PlanetaryGpuPageInput(float4 DirectionRadius, float4 Sampling);
+
+public readonly record struct PlanetaryGpuPageMetadata(float4 Address, float4 Layout, float4 Bounds, float4 State);
+
+public readonly record struct PlanetaryGpuPageContent(
+    PlanetaryPageLayout Layout,
+    PlanetaryGpuPageInput[] Inputs,
+    float SampleSpacing,
+    float ParentSampleSpacing);
+
+public static class PlanetaryGpuPageBuilder
+{
+    public static PlanetaryGpuPageContent BuildContent(PlanetaryPageLayout layout, float radius)
+    {
+        layout.Validate();
+        if (!float.IsFinite(radius) || radius <= 0) throw new ArgumentOutOfRangeException(nameof(radius));
+        var spacing = PlanetaryPageSampling.NominalAngularTexelSize(layout) * radius;
+        var parentSpacing = layout.Tile.Level == 0
+            ? 0
+            : PlanetaryPageSampling.NominalAngularTexelSize(new(layout.Tile.Parent(), layout.InteriorSize, layout.BorderSize)) * radius;
+        var inputs = new PlanetaryGpuPageInput[layout.StorageSize * layout.StorageSize];
+        for (var y = 0; y < layout.StorageSize; y++)
+        for (var x = 0; x < layout.StorageSize; x++)
+        {
+            var direction = PlanetaryPageSampling.Direction(layout, x, y);
+            inputs[y * layout.StorageSize + x] = new(
+                new float4(direction, radius),
+                new float4(spacing, parentSpacing, 0, 0));
+        }
+        return new(layout, inputs, spacing, parentSpacing);
+    }
+
+    public static PlanetaryGpuPageMetadata Metadata(
+        in PlanetaryGpuPageContent content,
+        int outputOffset,
+        float blend,
+        float4 bounds = default)
+    {
+        content.Layout.Validate();
+        if (content.Inputs == null || content.Inputs.Length != content.Layout.StorageSize * content.Layout.StorageSize)
+            throw new ArgumentException("GPU page content does not match its layout.", nameof(content));
+        if (outputOffset < 0) throw new ArgumentOutOfRangeException(nameof(outputOffset));
+        if (!float.IsFinite(blend) || blend is < 0 or > 1) throw new ArgumentOutOfRangeException(nameof(blend));
+        var tile = content.Layout.Tile;
+        return new(
+            new float4((int)tile.Face, tile.Level, tile.X, tile.Y),
+            new float4(outputOffset, content.Layout.StorageSize, content.Layout.InteriorSize, content.Layout.BorderSize),
+            bounds,
+            new float4(1, blend, PlanetaryPageSampling.NominalAngularTexelSize(content.Layout), content.SampleSpacing));
+    }
+}
diff --git a/src/CultMath/PlanetaryGpuPages.cs.meta b/src/CultMath/PlanetaryGpuPages.cs.meta
new file mode 100644
index 0000000..7afe847
--- /dev/null
+++ b/src/CultMath/PlanetaryGpuPages.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 42173c60766948a4e8c376687033532e
\ No newline at end of file
diff --git a/src/CultMath/PlanetaryMapTileEncoding.cs b/src/CultMath/PlanetaryMapTileEncoding.cs
new file mode 100644
index 0000000..ec55661
--- /dev/null
+++ b/src/CultMath/PlanetaryMapTileEncoding.cs
@@ -0,0 +1,117 @@
+using System;
+using System.IO;
+using System.Text;
+
+namespace CultMath;
+
+public static class PlanetaryMapTileEncoding
+{
+    public const uint FormatVersion = 1;
+    private static readonly byte[] Magic = Encoding.ASCII.GetBytes("CMPT");
+
+    public static void Write(Stream stream, in PlanetarySurfaceMapTile tile, bool leaveOpen = false)
+    {
+        if (stream == null || !stream.CanWrite) throw new ArgumentException("A writable stream is required.", nameof(stream));
+        tile.Key.Validate();
+        if (tile.Samples == null || tile.Validity == null || tile.Samples.Length != tile.Validity.Length)
+            throw new ArgumentException("Tile samples and validity must have equal lengths.", nameof(tile));
+        var expectedCount = tile.Key.Layout.StorageSize * tile.Key.Layout.StorageSize;
+        if (tile.Samples.Length != expectedCount) throw new ArgumentException("Tile payload does not match its layout.", nameof(tile));
+
+        using var writer = new BinaryWriter(stream, Encoding.UTF8, leaveOpen);
+        writer.Write(Magic);
+        writer.Write(FormatVersion);
+        writer.Write(tile.Key.FieldVersion);
+        writer.Write(tile.Key.ProjectionVersion);
+        writer.Write(tile.Key.LayerId);
+        var projection = tile.Key.Layout.Projection;
+        writer.Write((int)projection.Kind);
+        writer.Write(projection.CenterLongitude);
+        writer.Write(projection.CenterLatitude);
+        writer.Write(projection.Scale);
+        writer.Write(tile.Key.Layout.Level);
+        writer.Write(tile.Key.Layout.X);
+        writer.Write(tile.Key.Layout.Y);
+        writer.Write(tile.Key.Layout.InteriorSize);
+        writer.Write(tile.Key.Layout.BorderSize);
+        writer.Write(tile.Key.QueryScale.FootprintMeters);
+        writer.Write(tile.Key.QueryScale.MaximumUnresolvedHeight);
+        writer.Write(tile.Samples.Length);
+        for (var i = 0; i < tile.Samples.Length; i++)
+        {
+            writer.Write(tile.Validity[i]);
+            if (!tile.Validity[i]) continue;
+            WriteSample(writer, tile.Samples[i], tile.Key.FieldVersion);
+        }
+    }
+
+    public static PlanetarySurfaceMapTile Read(Stream stream, bool leaveOpen = false)
+    {
+        if (stream == null || !stream.CanRead) throw new ArgumentException("A readable stream is required.", nameof(stream));
+        using var reader = new BinaryReader(stream, Encoding.UTF8, leaveOpen);
+        var magic = reader.ReadBytes(Magic.Length);
+        if (magic.Length != Magic.Length || !magic.AsSpan().SequenceEqual(Magic)) throw new InvalidDataException("Not a CultMath planetary tile.");
+        var version = reader.ReadUInt32();
+        if (version != FormatVersion) throw new InvalidDataException($"Unsupported planetary tile version {version}.");
+        var fieldVersion = reader.ReadUInt64();
+        var projectionVersion = reader.ReadUInt32();
+        var layerId = reader.ReadUInt32();
+        var kindValue = reader.ReadInt32();
+        if (!Enum.IsDefined(typeof(PlanetaryProjectionKind), kindValue)) throw new InvalidDataException("Unknown planetary projection kind.");
+        var projection = new PlanetaryProjectionParameters(
+            (PlanetaryProjectionKind)kindValue,
+            reader.ReadDouble(), reader.ReadDouble(), reader.ReadDouble()).Validate();
+        var layout = new PlanetaryMapTileLayout(
+            projection,
+            reader.ReadInt32(), reader.ReadInt32(), reader.ReadInt32(),
+            reader.ReadInt32(), reader.ReadInt32()).Validate();
+        var scale = new PlanetaryQueryScale(reader.ReadSingle(), reader.ReadSingle()).Validate();
+        var key = new PlanetaryMapTileKey(fieldVersion, projectionVersion, layerId, layout, scale).Validate();
+        var count = reader.ReadInt32();
+        if (count != layout.StorageSize * layout.StorageSize) throw new InvalidDataException("Planetary tile sample count does not match layout.");
+        var samples = new PlanetarySurfaceSample[count];
+        var validity = new bool[count];
+        for (var i = 0; i < count; i++)
+        {
+            validity[i] = reader.ReadBoolean();
+            if (validity[i]) samples[i] = ReadSample(reader, fieldVersion);
+        }
+        if (stream.CanSeek && stream.Position != stream.Length) throw new InvalidDataException("Planetary tile has trailing bytes.");
+        return new(key, samples, validity);
+    }
+
+    private static void WriteSample(BinaryWriter writer, PlanetarySurfaceSample sample, ulong fieldVersion)
+    {
+        if (sample.FieldVersion != fieldVersion) throw new ArgumentException("Sample field version does not match tile identity.");
+        Write(writer, sample.UnitDirection);
+        writer.Write(sample.Radius);
+        writer.Write(sample.RadialDisplacement);
+        Write(writer, sample.TangentGradient);
+        Write(writer, sample.SurfaceNormal);
+        writer.Write(sample.Slope);
+        writer.Write(sample.Ridge);
+        writer.Write(sample.Gully);
+        writer.Write(sample.FinestResolvedWavelength);
+        writer.Write(sample.UnresolvedHeightBound);
+    }
+
+    private static PlanetarySurfaceSample ReadSample(BinaryReader reader, ulong fieldVersion)
+    {
+        var direction = ReadFloat3(reader);
+        var radius = reader.ReadSingle();
+        var displacement = reader.ReadSingle();
+        var gradient = ReadFloat3(reader);
+        var normal = ReadFloat3(reader);
+        return new(
+            fieldVersion, direction, radius, displacement, gradient, normal,
+            reader.ReadSingle(), reader.ReadSingle(), reader.ReadSingle(),
+            reader.ReadSingle(), reader.ReadSingle());
+    }
+
+    private static void Write(BinaryWriter writer, float3 value)
+    {
+        writer.Write(value.x); writer.Write(value.y); writer.Write(value.z);
+    }
+
+    private static float3 ReadFloat3(BinaryReader reader) => new(reader.ReadSingle(), reader.ReadSingle(), reader.ReadSingle());
+}
diff --git a/src/CultMath/PlanetaryMapTileEncoding.cs.meta b/src/CultMath/PlanetaryMapTileEncoding.cs.meta
new file mode 100644
index 0000000..76484f6
--- /dev/null
+++ b/src/CultMath/PlanetaryMapTileEncoding.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 6898f6de57df20646a0b9077bb923592
\ No newline at end of file
diff --git a/src/CultMath/PlanetaryPages.cs b/src/CultMath/PlanetaryPages.cs
index c9cff51..699a5c1 100644
--- a/src/CultMath/PlanetaryPages.cs
+++ b/src/CultMath/PlanetaryPages.cs
@@ -1,3 +1,5 @@
+using System;
+
 namespace CultMath;
 
 public readonly record struct PlanetaryPageLayout(PlanetaryTileAddress Tile, int InteriorSize, int BorderSize)
diff --git a/src/CultMath/PlanetaryPages.cs.meta b/src/CultMath/PlanetaryPages.cs.meta
new file mode 100644
index 0000000..91fdc27
--- /dev/null
+++ b/src/CultMath/PlanetaryPages.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 7af9a0354faa56348a2e07188739a0ae
\ No newline at end of file
diff --git a/src/CultMath/PlanetaryPatch.cs b/src/CultMath/PlanetaryPatch.cs
index 0fd3cbb..30c852f 100644
--- a/src/CultMath/PlanetaryPatch.cs
+++ b/src/CultMath/PlanetaryPatch.cs
@@ -1,3 +1,6 @@
+using System;
+using System.Linq;
+
 namespace CultMath;
 
 public readonly record struct PlanetaryPatchVertex(float2 LocalCoordinate, float3 UnitDirection);
diff --git a/src/CultMath/PlanetaryPatch.cs.meta b/src/CultMath/PlanetaryPatch.cs.meta
new file mode 100644
index 0000000..efd8156
--- /dev/null
+++ b/src/CultMath/PlanetaryPatch.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 04651571f7d240a418c1f6aafa217fa6
\ No newline at end of file
diff --git a/src/CultMath/PlanetaryProjection.cs b/src/CultMath/PlanetaryProjection.cs
index f849fe2..a82ebfd 100644
--- a/src/CultMath/PlanetaryProjection.cs
+++ b/src/CultMath/PlanetaryProjection.cs
@@ -1,3 +1,5 @@
+using System;
+
 namespace CultMath;
 
 public enum PlanetaryProjectionKind
diff --git a/src/CultMath/PlanetaryProjection.cs.meta b/src/CultMath/PlanetaryProjection.cs.meta
new file mode 100644
index 0000000..7b1e665
--- /dev/null
+++ b/src/CultMath/PlanetaryProjection.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 5021202cf626f7442a57961255a8a217
\ No newline at end of file
diff --git a/src/CultMath/PlanetaryQueries.cs b/src/CultMath/PlanetaryQueries.cs
index 1f11ca7..54a9a3e 100644
--- a/src/CultMath/PlanetaryQueries.cs
+++ b/src/CultMath/PlanetaryQueries.cs
@@ -1,3 +1,5 @@
+using System;
+
 namespace CultMath;
 
 public readonly record struct PlanetaryRadialBounds(float MinimumDisplacement, float MaximumDisplacement)
diff --git a/src/CultMath/PlanetaryQueries.cs.meta b/src/CultMath/PlanetaryQueries.cs.meta
new file mode 100644
index 0000000..6fd1141
--- /dev/null
+++ b/src/CultMath/PlanetaryQueries.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 2ec43c567214b8247bda19b5c120c200
\ No newline at end of file
diff --git a/src/CultMath/PlanetaryRadialRefinement.cs.meta b/src/CultMath/PlanetaryRadialRefinement.cs.meta
new file mode 100644
index 0000000..32af265
--- /dev/null
+++ b/src/CultMath/PlanetaryRadialRefinement.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 82e4db521edc253499220458b417fd1e
\ No newline at end of file
diff --git a/src/CultMath/PlanetaryResidency.cs b/src/CultMath/PlanetaryResidency.cs
index e5dca11..6918ac5 100644
--- a/src/CultMath/PlanetaryResidency.cs
+++ b/src/CultMath/PlanetaryResidency.cs
@@ -1,3 +1,7 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
 namespace CultMath;
 
 public readonly record struct PlanetaryLodParameters(
@@ -71,9 +75,9 @@ public readonly record struct PlanetaryResidencySnapshot(
 /// <summary>Owns presentation residency only. It never owns field content.</summary>
 public sealed class PlanetaryResidualResidency
 {
-    private readonly Dictionary<ulong, PlanetaryTileAddress> residents = [];
-    private readonly Dictionary<ulong, float> arrivals = [];
-    private readonly Dictionary<ulong, (float Time, float StartingBlend)> departures = [];
+    private readonly Dictionary<ulong, PlanetaryTileAddress> residents = new();
+    private readonly Dictionary<ulong, float> arrivals = new();
+    private readonly Dictionary<ulong, (float Time, float StartingBlend)> departures = new();
     private float lastTime = float.NegativeInfinity;
 
     public void Reset()
diff --git a/src/CultMath/PlanetaryResidency.cs.meta b/src/CultMath/PlanetaryResidency.cs.meta
new file mode 100644
index 0000000..2434762
--- /dev/null
+++ b/src/CultMath/PlanetaryResidency.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 0585ea15edd7f1c4fa272df4911a8d6f
\ No newline at end of file
diff --git a/src/CultMath/PlanetaryTopology.cs b/src/CultMath/PlanetaryTopology.cs
index c853507..57d562c 100644
--- a/src/CultMath/PlanetaryTopology.cs
+++ b/src/CultMath/PlanetaryTopology.cs
@@ -1,3 +1,5 @@
+using System;
+
 namespace CultMath;
 
 public enum PlanetaryCubeFace
@@ -104,6 +106,14 @@ public static class PlanetaryTopology
         return math.normalize(cube);
     }
 
+    public static float3 NormalizedCubeDirection(PlanetaryFaceCoordinate coordinate)
+    {
+        coordinate.Validate(allowOutsideFace: true);
+        var u = (float)coordinate.U;
+        var v = (float)coordinate.V;
+        return math.normalize(CubeVector(coordinate.Face, u, v));
+    }
+
     public static PlanetaryFaceCoordinate FaceCoordinate(float3 direction)
     {
         ValidateDirection(direction);
@@ -156,6 +166,17 @@ public static class PlanetaryTopology
         MathF.Atan(cubeU) / QuarterPi,
         MathF.Atan(cubeV) / QuarterPi);
 
+    private static float3 CubeVector(PlanetaryCubeFace face, float u, float v) => face switch
+    {
+        PlanetaryCubeFace.PositiveX => new float3(1, v, -u),
+        PlanetaryCubeFace.NegativeX => new float3(-1, v, u),
+        PlanetaryCubeFace.PositiveY => new float3(u, 1, -v),
+        PlanetaryCubeFace.NegativeY => new float3(u, -1, v),
+        PlanetaryCubeFace.PositiveZ => new float3(u, v, 1),
+        PlanetaryCubeFace.NegativeZ => new float3(-u, v, -1),
+        _ => throw new ArgumentOutOfRangeException(nameof(face)),
+    };
+
     internal static void ValidateDirection(float3 direction)
     {
         ValidateFinite(direction, nameof(direction));
diff --git a/src/CultMath/PlanetaryTopology.cs.meta b/src/CultMath/PlanetaryTopology.cs.meta
new file mode 100644
index 0000000..411a8bd
--- /dev/null
+++ b/src/CultMath/PlanetaryTopology.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 88f6789c4384f7846ac4be37613fe5ed
\ No newline at end of file
diff --git a/src/CultMath/SphericalErosion.cs.meta b/src/CultMath/SphericalErosion.cs.meta
new file mode 100644
index 0000000..82db773
--- /dev/null
+++ b/src/CultMath/SphericalErosion.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 59ec2db73065f6c4483ad90f5e17850e
\ No newline at end of file
diff --git a/tests/CultMath.Tests/AdvancedErosionFilterTests.cs.meta b/tests/CultMath.Tests/AdvancedErosionFilterTests.cs.meta
new file mode 100644
index 0000000..253ee42
--- /dev/null
+++ b/tests/CultMath.Tests/AdvancedErosionFilterTests.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: a7c85309318ae3f4ba75ac28a4f661cf
\ No newline at end of file
diff --git a/tests/CultMath.Tests/ErosionFrequencyBandsTests.cs.meta b/tests/CultMath.Tests/ErosionFrequencyBandsTests.cs.meta
new file mode 100644
index 0000000..ef15b7e
--- /dev/null
+++ b/tests/CultMath.Tests/ErosionFrequencyBandsTests.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 095f8ed13d2f2f74baefd23310395256
\ No newline at end of file
diff --git a/tests/CultMath.Tests/HlslMirrorTests.cs b/tests/CultMath.Tests/HlslMirrorTests.cs
index 567b038..5e1451c 100644
--- a/tests/CultMath.Tests/HlslMirrorTests.cs
+++ b/tests/CultMath.Tests/HlslMirrorTests.cs
@@ -78,6 +78,8 @@ public sealed class HlslMirrorTests
         Assert.Contains("cultmath_planetary_field_sample", planetary);
         Assert.Contains("cultmath_planetary_equirectangular_forward", planetary);
         Assert.Contains("cultmath_planetary_equal_earth_forward", planetary);
+        Assert.Contains("cultmath_planetary_projection_forward", planetary);
+        Assert.Contains("cultmath_planetary_projection_inverse", planetary);
         Assert.Contains("CultMathPlanetarySurfaceSample", planetary);
     }
 
diff --git a/tests/CultMath.Tests/PlanetaryFieldTests.cs.meta b/tests/CultMath.Tests/PlanetaryFieldTests.cs.meta
new file mode 100644
index 0000000..1710b5f
--- /dev/null
+++ b/tests/CultMath.Tests/PlanetaryFieldTests.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: c747cfda80df21d41a57412d8d07c08a
\ No newline at end of file
diff --git a/tests/CultMath.Tests/PlanetaryGpuPageTests.cs b/tests/CultMath.Tests/PlanetaryGpuPageTests.cs
new file mode 100644
index 0000000..ea17b4b
--- /dev/null
+++ b/tests/CultMath.Tests/PlanetaryGpuPageTests.cs
@@ -0,0 +1,25 @@
+using Xunit;
+
+namespace CultMath.Tests;
+
+public sealed class PlanetaryGpuPageTests
+{
+    [Fact]
+    public void UploadContentUsesCanonicalDirectionsSpacingAndMetadata()
+    {
+        var layout = new PlanetaryPageLayout(new(PlanetaryCubeFace.NegativeY, 3, 4, 2), 9, 2);
+        var content = PlanetaryGpuPageBuilder.BuildContent(layout, 8.4f);
+        Assert.Equal(layout.StorageSize * layout.StorageSize, content.Inputs.Length);
+        Assert.True(content.ParentSampleSpacing > content.SampleSpacing);
+        var first = content.Inputs[0];
+        Assert.Equal(PlanetaryPageSampling.Direction(layout, 0, 0), first.DirectionRadius.xyz);
+        Assert.Equal(8.4f, first.DirectionRadius.w);
+        Assert.Equal(content.SampleSpacing, first.Sampling.x);
+        Assert.Equal(content.ParentSampleSpacing, first.Sampling.y);
+
+        var metadata = PlanetaryGpuPageBuilder.Metadata(content, 37, 0.25f);
+        Assert.Equal(new float4((int)layout.Tile.Face, layout.Tile.Level, layout.Tile.X, layout.Tile.Y), metadata.Address);
+        Assert.Equal(new float4(37, layout.StorageSize, layout.InteriorSize, layout.BorderSize), metadata.Layout);
+        Assert.Equal(0.25f, metadata.State.y);
+    }
+}
diff --git a/tests/CultMath.Tests/PlanetaryGpuPageTests.cs.meta b/tests/CultMath.Tests/PlanetaryGpuPageTests.cs.meta
new file mode 100644
index 0000000..00f4a3a
--- /dev/null
+++ b/tests/CultMath.Tests/PlanetaryGpuPageTests.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 87266638e8010f546ab6c430a712868b
\ No newline at end of file
diff --git a/tests/CultMath.Tests/PlanetaryMapTileEncodingTests.cs b/tests/CultMath.Tests/PlanetaryMapTileEncodingTests.cs
new file mode 100644
index 0000000..112cb31
--- /dev/null
+++ b/tests/CultMath.Tests/PlanetaryMapTileEncodingTests.cs
@@ -0,0 +1,52 @@
+using System.IO;
+using Xunit;
+
+namespace CultMath.Tests;
+
+public sealed class PlanetaryMapTileEncodingTests
+{
+    [Fact]
+    public void BinaryTileRoundTripsIdentityValidityAndSurfaceEvidence()
+    {
+        var field = PlanetaryFieldDefinition.Create(5, 10, 3, AdvancedErosionParameters.Default);
+        var layout = new PlanetaryMapTileLayout(new(PlanetaryProjectionKind.EqualEarth), 1, 1, 0, 5, 1);
+        var key = new PlanetaryMapTileKey(field.FieldVersion, 2, 17, layout, PlanetaryQueryScale.AtFootprint(0.25f, 0.1f));
+        var tile = PlanetaryMapTileBaker.Bake(field, key, new FlatField());
+        using var bytes = new MemoryStream();
+        PlanetaryMapTileEncoding.Write(bytes, tile, leaveOpen: true);
+        bytes.Position = 0;
+        var decoded = PlanetaryMapTileEncoding.Read(bytes);
+
+        Assert.Equal(tile.Key, decoded.Key);
+        Assert.Equal(tile.Validity, decoded.Validity);
+        for (var i = 0; i < tile.Samples.Length; i++)
+            if (tile.Validity[i]) Assert.Equal(tile.Samples[i], decoded.Samples[i]);
+    }
+
+    [Fact]
+    public void DecoderRejectsForeignMagicAndVersions()
+    {
+        Assert.Throws<InvalidDataException>(() => PlanetaryMapTileEncoding.Read(new MemoryStream(new byte[] { 1, 2, 3, 4, 1, 0, 0, 0 })));
+        var bytes = new byte[] { (byte)'C', (byte)'M', (byte)'P', (byte)'T', 99, 0, 0, 0 };
+        Assert.Throws<InvalidDataException>(() => PlanetaryMapTileEncoding.Read(new MemoryStream(bytes)));
+    }
+
+    [Fact]
+    public void DecoderRejectsTrailingBytes()
+    {
+        var field = PlanetaryFieldDefinition.Create(2, 1, 0, AdvancedErosionParameters.Default);
+        var layout = new PlanetaryMapTileLayout(new(PlanetaryProjectionKind.Equirectangular), 0, 0, 0, 2, 0);
+        var key = new PlanetaryMapTileKey(field.FieldVersion, 1, 0, layout, PlanetaryQueryScale.AtFootprint(1));
+        var tile = PlanetaryMapTileBaker.Bake(field, key, new FlatField());
+        using var bytes = new MemoryStream();
+        PlanetaryMapTileEncoding.Write(bytes, tile, leaveOpen: true);
+        bytes.WriteByte(0xff);
+        bytes.Position = 0;
+        Assert.Throws<InvalidDataException>(() => PlanetaryMapTileEncoding.Read(bytes));
+    }
+
+    private readonly struct FlatField : IPlanetaryBaseField
+    {
+        public PlanetaryBaseFieldSample Sample(float3 direction) => new(0, float3.zero, 0, float3.zero, 0);
+    }
+}
diff --git a/tests/CultMath.Tests/PlanetaryMapTileEncodingTests.cs.meta b/tests/CultMath.Tests/PlanetaryMapTileEncodingTests.cs.meta
new file mode 100644
index 0000000..027754e
--- /dev/null
+++ b/tests/CultMath.Tests/PlanetaryMapTileEncodingTests.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: e916ef83478d48b43ac99777f5e0f731
\ No newline at end of file
diff --git a/tests/CultMath.Tests/PlanetaryPageTests.cs.meta b/tests/CultMath.Tests/PlanetaryPageTests.cs.meta
new file mode 100644
index 0000000..70a4386
--- /dev/null
+++ b/tests/CultMath.Tests/PlanetaryPageTests.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 7c3ae5598d3b9164a9bd3a736a22ba9a
\ No newline at end of file
diff --git a/tests/CultMath.Tests/PlanetaryPatchTests.cs.meta b/tests/CultMath.Tests/PlanetaryPatchTests.cs.meta
new file mode 100644
index 0000000..8599047
--- /dev/null
+++ b/tests/CultMath.Tests/PlanetaryPatchTests.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 36840ef44326f84409f850163b00e1f7
\ No newline at end of file
diff --git a/tests/CultMath.Tests/PlanetaryProjectionTests.cs.meta b/tests/CultMath.Tests/PlanetaryProjectionTests.cs.meta
new file mode 100644
index 0000000..7f37f78
--- /dev/null
+++ b/tests/CultMath.Tests/PlanetaryProjectionTests.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: f370036bb1663524fb4a4d47dfd50401
\ No newline at end of file
diff --git a/tests/CultMath.Tests/PlanetaryQueryTests.cs.meta b/tests/CultMath.Tests/PlanetaryQueryTests.cs.meta
new file mode 100644
index 0000000..d72b2cb
--- /dev/null
+++ b/tests/CultMath.Tests/PlanetaryQueryTests.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 93cf8771fdd520b41a4e931a6566a80a
\ No newline at end of file
diff --git a/tests/CultMath.Tests/PlanetaryRadialRefinementTests.cs.meta b/tests/CultMath.Tests/PlanetaryRadialRefinementTests.cs.meta
new file mode 100644
index 0000000..b9f3bea
--- /dev/null
+++ b/tests/CultMath.Tests/PlanetaryRadialRefinementTests.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: d34c0018ee2b700448b16540eca8ebcf
\ No newline at end of file
diff --git a/tests/CultMath.Tests/PlanetaryResidencyTests.cs.meta b/tests/CultMath.Tests/PlanetaryResidencyTests.cs.meta
new file mode 100644
index 0000000..be7de2b
--- /dev/null
+++ b/tests/CultMath.Tests/PlanetaryResidencyTests.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 9ece3b02dbd3d7448baabee7f1fba0ab
\ No newline at end of file
diff --git a/tests/CultMath.Tests/PlanetaryTopologyTests.cs b/tests/CultMath.Tests/PlanetaryTopologyTests.cs
index 6e6b083..759928d 100644
--- a/tests/CultMath.Tests/PlanetaryTopologyTests.cs
+++ b/tests/CultMath.Tests/PlanetaryTopologyTests.cs
@@ -52,4 +52,12 @@ public sealed class PlanetaryTopologyTests
         Assert.NotEqual(edge, border);
         Assert.Equal(1, math.length(border), 5);
     }
+
+    [Fact]
+    public void NormalizedCubeBaselineSharesFaceEdges()
+    {
+        var a = PlanetaryTopology.NormalizedCubeDirection(new(PlanetaryCubeFace.PositiveZ, 1, -0.4));
+        var b = PlanetaryTopology.NormalizedCubeDirection(new(PlanetaryCubeFace.PositiveX, -1, -0.4));
+        Assert.InRange(math.distance(a, b), 0, 1.0e-6f);
+    }
 }
diff --git a/tests/CultMath.Tests/PlanetaryTopologyTests.cs.meta b/tests/CultMath.Tests/PlanetaryTopologyTests.cs.meta
new file mode 100644
index 0000000..b693014
--- /dev/null
+++ b/tests/CultMath.Tests/PlanetaryTopologyTests.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: be3b0ec07fe65344db889d1e98448113
\ No newline at end of file
diff --git a/tests/CultMath.Tests/SphericalErosionTests.cs.meta b/tests/CultMath.Tests/SphericalErosionTests.cs.meta
new file mode 100644
index 0000000..00ff1de
--- /dev/null
+++ b/tests/CultMath.Tests/SphericalErosionTests.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 60eb9e9e9f8ae2948b13403f5080168e
\ No newline at end of file
diff --git a/tools/CultMath.PlanetaryTileFixture.meta b/tools/CultMath.PlanetaryTileFixture.meta
new file mode 100644
index 0000000..7f40b6a
--- /dev/null
+++ b/tools/CultMath.PlanetaryTileFixture.meta
@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 7197a2202273a9445b974bdd69109b1a
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/unity.meta b/unity.meta
new file mode 100644
index 0000000..de47a61
--- /dev/null
+++ b/unity.meta
@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 366efeaef9f68224b80229332c7ecfc6
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/unity/Runtime.meta b/unity/Runtime.meta
new file mode 100644
index 0000000..8e0678f
--- /dev/null
+++ b/unity/Runtime.meta
@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 8226365c03c5e1a438408b7e42b98740
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/unity/Runtime/CultMath.Unity.asmdef.meta b/unity/Runtime/CultMath.Unity.asmdef.meta
new file mode 100644
index 0000000..2dd3a36
--- /dev/null
+++ b/unity/Runtime/CultMath.Unity.asmdef.meta
@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: d1906c397c420ae4eb222a3f09f36843
+AssemblyDefinitionImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/unity/Runtime/PlanetaryPageUpload.cs b/unity/Runtime/PlanetaryPageUpload.cs
index f0b168c..1a61a70 100644
--- a/unity/Runtime/PlanetaryPageUpload.cs
+++ b/unity/Runtime/PlanetaryPageUpload.cs
@@ -36,12 +36,28 @@ public readonly struct PlanetaryPageMetadataGpu
     public readonly Vector4 State;
 }
 
-public readonly record struct PlanetaryPageUpload(
-    PlanetaryPageInputGpu[] Inputs,
-    PlanetaryPageMetadataGpu[] Metadata,
-    int OutputSampleCount,
-    ulong ContentVersion,
-    ulong PresentationVersion);
+public readonly struct PlanetaryPageUpload
+{
+    public PlanetaryPageUpload(
+        PlanetaryPageInputGpu[] inputs,
+        PlanetaryPageMetadataGpu[] metadata,
+        int outputSampleCount,
+        ulong contentVersion,
+        ulong presentationVersion)
+    {
+        Inputs = inputs;
+        Metadata = metadata;
+        OutputSampleCount = outputSampleCount;
+        ContentVersion = contentVersion;
+        PresentationVersion = presentationVersion;
+    }
+
+    public PlanetaryPageInputGpu[] Inputs { get; }
+    public PlanetaryPageMetadataGpu[] Metadata { get; }
+    public int OutputSampleCount { get; }
+    public ulong ContentVersion { get; }
+    public ulong PresentationVersion { get; }
+}
 
 public static class PlanetaryPageUploadBuilder
 {
@@ -57,25 +73,23 @@ public static class PlanetaryPageUploadBuilder
         foreach (var (resident, pageIndex) in snapshot.Tiles.Select((resident, index) => (resident, index)))
         {
             var layout = new PlanetaryPageLayout(resident.Tile, interiorSize, borderSize).Validate();
-            var spacing = PlanetaryPageSampling.NominalAngularTexelSize(layout) * radius;
-            var parentSpacing = resident.Tile.Level == 0
-                ? 0
-                : PlanetaryPageSampling.NominalAngularTexelSize(new(resident.Tile.Parent(), interiorSize, borderSize)) * radius;
+            var content = PlanetaryGpuPageBuilder.BuildContent(layout, radius);
             var outputOffset = inputs.Count;
-            for (var y = 0; y < layout.StorageSize; y++)
-            for (var x = 0; x < layout.StorageSize; x++)
+            foreach (var input in content.Inputs)
             {
-                var direction = PlanetaryPageSampling.Direction(layout, x, y);
                 inputs.Add(new(
-                    new Vector4(direction.x, direction.y, direction.z, radius),
-                    new Vector4(spacing, parentSpacing, 0, 0)));
+                    ToUnity(input.DirectionRadius),
+                    ToUnity(input.Sampling)));
             }
+            var commonMetadata = PlanetaryGpuPageBuilder.Metadata(content, outputOffset, resident.Blend);
             metadata[pageIndex] = new(
-                new Vector4((int)resident.Tile.Face, resident.Tile.Level, resident.Tile.X, resident.Tile.Y),
-                new Vector4(outputOffset, layout.StorageSize, layout.InteriorSize, layout.BorderSize),
-                Vector4.zero,
-                new Vector4(1, resident.Blend, PlanetaryPageSampling.NominalAngularTexelSize(layout), spacing));
+                ToUnity(commonMetadata.Address),
+                ToUnity(commonMetadata.Layout),
+                ToUnity(commonMetadata.Bounds),
+                ToUnity(commonMetadata.State));
         }
         return new(inputs.ToArray(), metadata, inputs.Count, snapshot.ContentVersion, snapshot.PresentationVersion);
     }
+
+    private static Vector4 ToUnity(float4 value) => new(value.x, value.y, value.z, value.w);
 }
diff --git a/unity/Runtime/PlanetaryPageUpload.cs.meta b/unity/Runtime/PlanetaryPageUpload.cs.meta
new file mode 100644
index 0000000..87bcb61
--- /dev/null
+++ b/unity/Runtime/PlanetaryPageUpload.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 7edd3bb2edb2e6448a2d54fc082c27dc
\ No newline at end of file
diff --git a/unity/Runtime/PlanetaryPatchMeshAdapter.cs.meta b/unity/Runtime/PlanetaryPatchMeshAdapter.cs.meta
new file mode 100644
index 0000000..69af0ab
--- /dev/null
+++ b/unity/Runtime/PlanetaryPatchMeshAdapter.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 9ad7b581e14ef774d8435069bb77ca6a
\ No newline at end of file
diff --git a/web.meta b/web.meta
new file mode 100644
index 0000000..d65ff3e
--- /dev/null
+++ b/web.meta
@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: daf45471f8b5f4f44a2cb86e77e010db
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/web/planetary-tile.cross-runtime.test.mjs b/web/planetary-tile.cross-runtime.test.mjs
new file mode 100644
index 0000000..2b45721
--- /dev/null
+++ b/web/planetary-tile.cross-runtime.test.mjs
@@ -0,0 +1,21 @@
+import assert from "node:assert/strict";
+import { readFile } from "node:fs/promises";
+import { decodePlanetarySurfaceTile } from "./planetary-tile.ts";
+
+if (process.argv.length !== 3) throw new Error("Expected a generated CMPT fixture path");
+const bytes = await readFile(process.argv[2]);
+const arrayBuffer = bytes.buffer.slice(bytes.byteOffset, bytes.byteOffset + bytes.byteLength);
+const tile = decodePlanetarySurfaceTile(arrayBuffer);
+assert.equal(tile.header.projectionVersion, 3);
+assert.equal(tile.header.layerId, 29);
+assert.equal(tile.header.projectionKind, 2);
+assert.equal(tile.header.interiorSize, 5);
+assert.equal(tile.header.borderSize, 1);
+assert.equal(tile.storageSize, 7);
+assert.equal(tile.samples.length, 49);
+assert.ok(tile.samples.some(sample => sample !== null));
+for (const sample of tile.samples) {
+  if (sample === null) continue;
+  assert.ok(Number.isFinite(sample.radialDisplacement));
+  assert.ok(Number.isFinite(sample.unresolvedHeightBound));
+}
diff --git a/web/planetary-tile.cross-runtime.test.mjs.meta b/web/planetary-tile.cross-runtime.test.mjs.meta
new file mode 100644
index 0000000..3c38da5
--- /dev/null
+++ b/web/planetary-tile.cross-runtime.test.mjs.meta
@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: 7bc397e5660d2b6448919c41983d35e8
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/web/planetary-tile.test.mjs b/web/planetary-tile.test.mjs
new file mode 100644
index 0000000..cb054f2
--- /dev/null
+++ b/web/planetary-tile.test.mjs
@@ -0,0 +1,39 @@
+import assert from "node:assert/strict";
+import { decodePlanetarySurfaceTile } from "./planetary-tile.ts";
+
+const bytes = new ArrayBuffer(152);
+const view = new DataView(bytes);
+let offset = 0;
+const u8 = value => view.setUint8(offset++, value);
+const u32 = value => { view.setUint32(offset, value, true); offset += 4; };
+const i32 = value => { view.setInt32(offset, value, true); offset += 4; };
+const u64 = value => { view.setBigUint64(offset, value, true); offset += 8; };
+const f32 = value => { view.setFloat32(offset, value, true); offset += 4; };
+const f64 = value => { view.setFloat64(offset, value, true); offset += 8; };
+
+for (const character of "CMPT") u8(character.charCodeAt(0));
+u32(1); u64(0x1234n); u32(2); u32(17); i32(0);
+f64(0); f64(0); f64(1);
+i32(0); i32(0); i32(0); i32(2); i32(0);
+f32(10); f32(0.5); i32(4);
+u8(1);
+for (const value of [1, 0, 0]) f32(value);
+f32(8.4); f32(0.25);
+for (const value of [0, 0.1, 0]) f32(value);
+for (const value of [0.99, -0.1, 0]) f32(value);
+for (const value of [0.1, 0.8, 0.2, 2.5, 0.05]) f32(value);
+u8(0); u8(0); u8(0);
+assert.equal(offset, bytes.byteLength);
+
+const tile = decodePlanetarySurfaceTile(bytes);
+assert.equal(tile.header.fieldVersion, 0x1234n);
+assert.equal(tile.header.layerId, 17);
+assert.equal(tile.storageSize, 2);
+assert.equal(tile.samples.length, 4);
+assert.equal(tile.samples[0]?.radialDisplacement, 0.25);
+assert.equal(tile.samples[1], null);
+
+assert.throws(() => decodePlanetarySurfaceTile(bytes.slice(0, bytes.byteLength - 1)), /Truncated/);
+const trailing = new Uint8Array(bytes.byteLength + 1);
+trailing.set(new Uint8Array(bytes));
+assert.throws(() => decodePlanetarySurfaceTile(trailing.buffer), /trailing/);
diff --git a/web/planetary-tile.test.mjs.meta b/web/planetary-tile.test.mjs.meta
new file mode 100644
index 0000000..d622095
--- /dev/null
+++ b/web/planetary-tile.test.mjs.meta
@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: 04c93ecab90d465499aa3d60722e6fc3
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/web/planetary-tile.ts b/web/planetary-tile.ts
new file mode 100644
index 0000000..e68d70f
--- /dev/null
+++ b/web/planetary-tile.ts
@@ -0,0 +1,89 @@
+export const CULTMATH_PLANETARY_TILE_VERSION = 1;
+
+export interface PlanetaryTileHeader {
+  fieldVersion: bigint;
+  projectionVersion: number;
+  layerId: number;
+  projectionKind: number;
+  centerLongitude: number;
+  centerLatitude: number;
+  projectionScale: number;
+  level: number;
+  x: number;
+  y: number;
+  interiorSize: number;
+  borderSize: number;
+  footprintMeters: number;
+  maximumUnresolvedHeight: number;
+}
+
+export interface PlanetaryTileSample {
+  direction: readonly [number, number, number];
+  radius: number;
+  radialDisplacement: number;
+  tangentGradient: readonly [number, number, number];
+  surfaceNormal: readonly [number, number, number];
+  slope: number;
+  ridge: number;
+  gully: number;
+  finestResolvedWavelength: number;
+  unresolvedHeightBound: number;
+}
+
+export interface PlanetarySurfaceTile {
+  header: PlanetaryTileHeader;
+  storageSize: number;
+  samples: readonly (PlanetaryTileSample | null)[];
+}
+
+export function decodePlanetarySurfaceTile(bytes: ArrayBuffer): PlanetarySurfaceTile {
+  const view = new DataView(bytes);
+  let offset = 0;
+  const u8 = () => view.getUint8(offset++);
+  const u32 = () => { const value = view.getUint32(offset, true); offset += 4; return value; };
+  const i32 = () => { const value = view.getInt32(offset, true); offset += 4; return value; };
+  const f32 = () => { const value = view.getFloat32(offset, true); offset += 4; return value; };
+  const f64 = () => { const value = view.getFloat64(offset, true); offset += 8; return value; };
+  const u64 = () => { const value = view.getBigUint64(offset, true); offset += 8; return value; };
+  const vector3 = (): [number, number, number] => [f32(), f32(), f32()];
+  const requireRemaining = (count: number) => {
+    if (offset + count > view.byteLength) throw new Error("Truncated CultMath planetary tile");
+  };
+
+  requireRemaining(8);
+  if (String.fromCharCode(u8(), u8(), u8(), u8()) !== "CMPT") throw new Error("Not a CultMath planetary tile");
+  const version = u32();
+  if (version !== CULTMATH_PLANETARY_TILE_VERSION) throw new Error(`Unsupported CultMath planetary tile version ${version}`);
+  requireRemaining(76);
+  const header: PlanetaryTileHeader = {
+    fieldVersion: u64(),
+    projectionVersion: u32(),
+    layerId: u32(),
+    projectionKind: i32(),
+    centerLongitude: f64(),
+    centerLatitude: f64(),
+    projectionScale: f64(),
+    level: i32(), x: i32(), y: i32(), interiorSize: i32(), borderSize: i32(),
+    footprintMeters: f32(), maximumUnresolvedHeight: f32(),
+  };
+  const count = i32();
+  const storageSize = header.interiorSize + header.borderSize * 2;
+  if (count !== storageSize * storageSize) throw new Error("CultMath planetary tile sample count does not match layout");
+  const samples: (PlanetaryTileSample | null)[] = new Array(count);
+  for (let index = 0; index < count; index++) {
+    requireRemaining(1);
+    if (u8() === 0) { samples[index] = null; continue; }
+    requireRemaining(64);
+    samples[index] = {
+      direction: vector3(),
+      radius: f32(),
+      radialDisplacement: f32(),
+      tangentGradient: vector3(),
+      surfaceNormal: vector3(),
+      slope: f32(), ridge: f32(), gully: f32(),
+      finestResolvedWavelength: f32(), unresolvedHeightBound: f32(),
+    };
+  }
+  if (offset !== view.byteLength) throw new Error("CultMath planetary tile has trailing bytes");
+  return { header, storageSize, samples };
+}
diff --git a/web/planetary-tile.ts.meta b/web/planetary-tile.ts.meta
new file mode 100644
index 0000000..337da3b
--- /dev/null
+++ b/web/planetary-tile.ts.meta
@@ -0,0 +1,7 @@
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+guid: f284e64628320844196b7aaea76475a4
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: