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DrawAhead.BeltDraw keeps the belt's meshes by the belt's key; empty candidates and a zero kept count are named refusals; ZoneRenderer draws through DrawBelts and one DrawInstanced seam

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The unseeded Random.Range prune leaves ZoneRenderer: the kept set is a function of the candidates, the kept count and the belt key.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Meta Vens 2026-10-18 00:23:47 +02:00
commit 72e2383ea4
3 changed files with 103 additions and 43 deletions
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47
Assets/Scripts/ServerShared/DrawAhead.cs
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@ -53,11 +53,13 @@ public static class DrawAhead
public RockDraw(int rock, float scale) { Rock = rock; Scale = scale; }
}
// The whole per-rock draw list of a belt (ruling rock-meshes-by-size); the renderer decides nothing and indexes nothing. Meshes are the kept
// candidates ranked ascending by radius, and ByMesh[m] lists the rocks drawn on Meshes[m], so a renderer batching by mesh iterates the two together.
// Rocks ranked by unworn size split into one run per mesh, smallest rocks on the smallest mesh and the last run taking the remainder; equal sizes and
// equal radii rank by index, and a mesh lists its rocks by index. Unworn, so a mined rock keeps its mesh and only shrinks.
// A list starts with every Scale NaN; Draw fills each entry's Scale from the poses (pose.w is the rock's gameplay radius) and returns the same arrays every call.
// The whole per-rock draw list of a belt (ruling rock-meshes-by-size); the renderer decides nothing and indexes nothing. The belt keeps `keep` of
// the candidate meshes, chosen by the belt's key alone (a hash of key and candidate index, ties by index), so a belt looks the same on every load
// and every client. Meshes are the kept candidates ranked ascending by radius, and ByMesh[m] lists the rocks drawn on Meshes[m], so a renderer
// batching by mesh iterates the two together. Rocks ranked by unworn size split into one run per mesh, smallest rocks on the smallest mesh and the
// last run taking the remainder; equal sizes rank by index, equal radii by candidate index, and a mesh lists its rocks by index. Unworn, so a mined
// rock keeps its mesh and only shrinks. A list starts with every Scale NaN; Draw fills each entry's Scale from the poses (pose.w is the rock's
// gameplay radius) and returns the same arrays every call.
public sealed class BeltDraw<T>
{
private readonly float[] _radii;
@ -66,21 +68,34 @@ public static class DrawAhead
public T[] Meshes { get; }
public RockDraw[][] ByMesh { get; }
public BeltDraw(IReadOnlyList<float> unwornSizes, IReadOnlyList<T> candidates, System.Func<T, float> radius)
public BeltDraw(IReadOnlyList<float> unwornSizes, IReadOnlyList<T> candidates, System.Func<T, float> radius, int keep, string beltKey)
{
if (candidates.Count == 0) throw new System.ArgumentException("AsteroidMeshes is empty: a belt needs at least one rock mesh.");
if (keep < 1) throw new System.ArgumentException("AsteroidMeshCount is below 1: a belt keeps at least one rock mesh.");
var radii = candidates.Select(radius).ToArray();
for (var m = 0; m < radii.Length; m++)
if (!(radii[m] > 0f)) throw new System.ArgumentException($"InstancedMesh.Radius of mesh #{m} is not set (zero, negative or not a number): run RockMeshRadius.Fill.");
var meshByRank = Enumerable.Range(0, radii.Length).OrderBy(m => radii[m]).ThenBy(m => m).ToArray();
_radii = meshByRank.Select(m => radii[m]).ToArray();
Meshes = meshByRank.Select(m => candidates[m]).ToArray();
for (var c = 0; c < radii.Length; c++)
if (!(radii[c] > 0f)) throw new System.ArgumentException($"InstancedMesh.Radius of mesh #{c} is not set (zero, negative or not a number): run RockMeshRadius.Fill.");
var meshByRank = Enumerable.Range(0, radii.Length).OrderBy(c => KeepOrder(beltKey, c)).ThenBy(c => c).Take(keep)
.OrderBy(c => radii[c]).ThenBy(c => c).ToArray();
_radii = meshByRank.Select(c => radii[c]).ToArray();
Meshes = meshByRank.Select(c => candidates[c]).ToArray();
var rockByRank = Enumerable.Range(0, unwornSizes.Count).OrderBy(i => unwornSizes[i]).ThenBy(i => i).ToArray();
var run = System.Math.Max(1, unwornSizes.Count / radii.Length);
_rocks = Enumerable.Range(0, radii.Length).Select(m => rockByRank
.Where((_, rank) => System.Math.Min(rank / run, radii.Length - 1) == m).OrderBy(i => i).ToArray()).ToArray();
var run = System.Math.Max(1, unwornSizes.Count / Meshes.Length);
_rocks = Enumerable.Range(0, Meshes.Length).Select(m => rockByRank
.Where((_, rank) => System.Math.Min(rank / run, Meshes.Length - 1) == m).OrderBy(i => i).ToArray()).ToArray();
ByMesh = _rocks.Select(r => r.Select(rock => new RockDraw(rock, float.NaN)).ToArray()).ToArray();
}
// FNV-1a over the belt's key, mixed with the candidate index: a fixed function of its inputs, no global random state.
private static ulong KeepOrder(string beltKey, int candidate)
{
var h = 14695981039346656037UL;
foreach (var ch in beltKey) { h ^= ch; h *= 1099511628211UL; }
h ^= (uint)candidate; h *= 1099511628211UL;
h ^= h >> 32; h *= 0x9E3779B97F4A7C15UL; h ^= h >> 29;
return h;
}
public RockDraw[][] Draw(IReadOnlyList<float4> poses)
{
for (var m = 0; m < _rocks.Length; m++)
@ -90,8 +105,8 @@ public static class DrawAhead
}
}
public static BeltDraw<T> DrawListOf<T>(AsteroidBelt belt, PlanetSettings settings, IReadOnlyList<T> meshes, System.Func<T, float> radius) =>
new(Enumerable.Range(0, belt.Data.Asteroids.Length).Select(i => belt.UndamagedSize(i, settings)).ToArray(), meshes, radius);
public static BeltDraw<T> DrawListOf<T>(AsteroidBelt belt, PlanetSettings settings, IReadOnlyList<T> meshes, System.Func<T, float> radius, int keep, CultRecordKey beltKey) =>
new(Enumerable.Range(0, belt.Data.Asteroids.Length).Select(i => belt.UndamagedSize(i, settings)).ToArray(), meshes, radius, keep, beltKey.Value);
// A ship in a wormhole animation has its pose scripted by the step, not integrated from Velocity and TurnRate,
// so it is drawn where the step put it: extrapolating a scripted pose draws a streak that resets every step.