3a5b3b0bab
Zone.WellReference owns each body's reference zero (GetHeight uses it). Gravity.cginc mirrors GravityField.Potential; Brushes/Gravity Field draws depth = -h on layer 9 from a StructuredBuffer that GravityLowering.Lower fills from the zone each frame; GravityLowering.CreateField makes the one quad. GravityFieldParityVerify renders it and compares every texel with -Zone.GetHeight (max error 0.0059 u), the gradient with GetForce (0.03 degrees) and the wiring. Deleted: the Gravity Well children of Planet, Gas Giant, Sun and PlanetOutpost prefabs, Wormhole 1's three gravity children, their overrides in Main Menu and TestScene, five wormhole/wave materials and two brush shaders, Planet.GravityWellDepth/Radius, BodyData keys 6-7, PlanetSettings.GravityDepth/GravityRadius (and the Settings.asset keys). Surface Displacement culls layer 9 only. Headless build and tests not yet run at this commit. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
42 lines
1.4 KiB
HLSL
42 lines
1.4 KiB
HLSL
#ifndef AETHERIA_GRAVITY_INCLUDED
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#define AETHERIA_GRAVITY_INCLUDED
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// The lowering of the zone's potential (aetheria-gravity, cut grid-lowering). The law is ServerShared's GravityField
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// and the height is Zone.GetHeight; this file mirrors them and decides nothing. GravityLowering.Lower fills the
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// buffer and the globals from the zone (positions from Orbit.Position, reference from Zone.WellReference) each frame.
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// GravityFieldParityVerify renders it and compares every texel with -Zone.GetHeight.
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struct GravityWell
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{
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float2 position;
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float strength;
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float coreRadius;
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float reference;
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};
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StructuredBuffer<GravityWell> _GravityWells;
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int _GravityWellCount;
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float _HeightExaggeration;
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// GravityField.Potential, line for line: c is the well's strength, R its core radius, r the distance.
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float gravityPotential(float c, float R, float r)
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{
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return c == 0 ? 0 :
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r < R
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? c * r * r / (2 * R * R)
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: c * (log(r / R) + .5);
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}
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// Zone.GetHeight at world xz: each well's potential minus its own reference, summed, divided by the exaggeration.
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float gravityHeight(float2 p)
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{
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float result = 0;
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for (int i = 0; i < _GravityWellCount; i++)
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{
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GravityWell well = _GravityWells[i];
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result += gravityPotential(well.strength, well.coreRadius, length(p - well.position)) - well.reference;
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}
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return result / _HeightExaggeration;
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}
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#endif
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