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fix(environment): tune grass and terrain grounding

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This commit is contained in:
Tom Boullay
2026-05-28 00:59:36 +02:00
parent 3881e38a6d
commit ea23b4bb46
4 changed files with 55 additions and 10 deletions
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src/world/grass/grassShaders.ts
+14 -4
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@@ -17,10 +17,14 @@ export const grassVertexShader = /* glsl */ `
uniform float uWindDirection;
uniform float uWindSpeed;
uniform float uWindNoiseScale;
uniform float uWindStrength;
uniform float uBaldPatchModifier;
uniform float uFalloffSharpness;
uniform float uHeightNoiseFrequency;
uniform float uHeightNoiseAmplitude;
uniform float uClumpFrequency;
uniform float uClumpThreshold;
uniform float uClumpSoftness;
uniform float uMaxBendAngle;
uniform float uMaxBladeHeight;
uniform float uRandomHeightAmount;
@@ -69,8 +73,13 @@ export const grassVertexShader = /* glsl */ `
transformed.y = terrainHeight + uSurfaceOffset;
vec3 heightNoise = texture2D(uNoiseTexture, terrainUv.yx * vec2(uHeightNoiseFrequency)).rgb;
float heightModifier = ((heightNoise.r + heightNoise.g + heightNoise.b) * uMaxBladeHeight) * uHeightNoiseAmplitude;
float heightNoiseAverage = (heightNoise.r + heightNoise.g + heightNoise.b) / 3.0;
vec2 clumpUv = (worldPos.xz / uPatchSize) * uClumpFrequency;
float clumpNoise = texture2D(uNoiseTexture, clumpUv).r;
float clumpMask = smoothstep(uClumpThreshold, uClumpThreshold + uClumpSoftness, clumpNoise);
float heightModifier = uMaxBladeHeight * mix(0.35, 1.0, heightNoiseAverage) * uHeightNoiseAmplitude;
heightModifier += random(terrainUv) * (uRandomHeightAmount * 0.1);
heightModifier = clamp(heightModifier, 0.0, uMaxBladeHeight);
float edgeDistanceX = abs(origin.x) / halfPatchSize;
float edgeDistanceZ = abs(origin.z) / halfPatchSize;
@@ -79,17 +88,18 @@ export const grassVertexShader = /* glsl */ `
float baldPatchOffset = heightNoise.r * (uBaldPatchModifier * (1.0 - edgeFactor));
heightModifier -= baldPatchOffset;
heightModifier = max(heightModifier, 0.0);
float edgeFade =
smoothstep(uBoundingBoxMin.x, uBoundingBoxMin.x + 2.0, worldPos.x) *
smoothstep(uBoundingBoxMax.x, uBoundingBoxMax.x - 2.0, worldPos.x) *
smoothstep(uBoundingBoxMin.z, uBoundingBoxMin.z + 2.0, worldPos.z) *
smoothstep(uBoundingBoxMax.z, uBoundingBoxMax.z - 2.0, worldPos.z);
heightModifier *= edgeFade;
heightModifier *= edgeFade * mix(0.45, 1.0, clumpMask);
float sideFactor = (color.r == 0.1) ? 1.0 : (color.b == 0.1) ? -1.0 : 0.0;
float tipFactor = color.g;
float width = smoothstep(0.5, 1.0, heightModifier * 2.0) * uBladeWidth;
float width = smoothstep(0.02, uMaxBladeHeight * 0.85, heightModifier) * uBladeWidth;
transformed += aYaw * (width / 2.0) * sideFactor;
vec3 textureColor = texture2D(uDiffuseMap, terrainUv * 10.0).rgb;
@@ -110,7 +120,7 @@ export const grassVertexShader = /* glsl */ `
vec3 windNoise = texture2D(uNoiseTexture, rotatedNoiseUV).rgb;
vec3 axis = vec3(windNoise.g, 0.0, windNoise.b);
float angle = radians(mapValue(windNoise.g + windNoise.b, 0.0, 2.0, -uMaxBendAngle, uMaxBendAngle)) * tipFactor;
float angle = radians(mapValue(windNoise.g + windNoise.b, 0.0, 2.0, -uMaxBendAngle, uMaxBendAngle)) * tipFactor * uWindStrength;
mat3 rotationMatrix = rotate3d(axis, angle);
vec3 basePosition = vec3(transformed.x, transformed.y - heightModifier, transformed.z);