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[change] src/geometry/terrain-mesh.ts
 [change] tests/geometry/terrain-mesh.test.ts
This commit is contained in:
Victor Giers
2026-05-21 07:59:27 +02:00
parent ee65a479e3
commit 77f1a19310
2 changed files with 55 additions and 78 deletions
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72
src/geometry/terrain-mesh.ts
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@@ -37,11 +37,7 @@ export interface DerivedTerrainMeshData {
export const TERRAIN_LOD_CHUNK_SIZE_CELLS = 64;
export const TERRAIN_LOD_STRIDES = [1, 2, 4, 8, 16] as const;
export const TERRAIN_LOD_DEBUG_COLORS = [
0xff4d4d,
0xffa53d,
0xffe66d,
0x4ee06f,
0x4ba3ff
0xff4d4d, 0xffa53d, 0xffe66d, 0x4ee06f, 0x4ba3ff
] as const;
const TERRAIN_LOD_DISTANCE_MULTIPLIERS = [0.75, 1.5, 3, 6] as const;
const TERRAIN_LOD_HYSTERESIS_RATIO = 0.16;
@@ -232,7 +228,9 @@ export function buildTerrainDerivedMeshData(
const vertexCount = terrain.sampleCountX * terrain.sampleCountZ;
const positions = new Float32Array(vertexCount * 3);
const uvs = new Float32Array(vertexCount * 2);
const layerWeights = new Float32Array(vertexCount * TERRAIN_SHADER_LAYER_COUNT);
const layerWeights = new Float32Array(
vertexCount * TERRAIN_SHADER_LAYER_COUNT
);
const foliageMaskWeights = new Float32Array(vertexCount);
const foliageMask =
options.foliageMaskLayerId === undefined ||
@@ -289,11 +287,7 @@ export function buildTerrainDerivedMeshData(
)
: foliageMask === null
? 0
: getTerrainFoliageMaskValueAtSample(
foliageMask,
sampleX,
sampleZ
);
: getTerrainFoliageMaskValueAtSample(foliageMask, sampleX, sampleZ);
foliageMaskWeightOffset += 1;
}
}
@@ -494,7 +488,11 @@ function sampleTerrainLayerWeightsAtSamplePosition(
): number[] {
const layerWeights = new Array<number>(terrain.layers.length).fill(0);
for (let layerIndex = 0; layerIndex < terrain.layers.length; layerIndex += 1) {
for (
let layerIndex = 0;
layerIndex < terrain.layers.length;
layerIndex += 1
) {
layerWeights[layerIndex] = sampleTerrainScalarAtSamplePosition(
terrain,
sampleX,
@@ -550,13 +548,22 @@ function pushTerrainLodNormal(
sampleZ: number,
normals: number[]
) {
const leftSampleX = clampSampleCoordinate(sampleX - 1, terrain.sampleCountX - 1);
const rightSampleX = clampSampleCoordinate(sampleX + 1, terrain.sampleCountX - 1);
const leftSampleX = clampSampleCoordinate(
sampleX - 1,
terrain.sampleCountX - 1
);
const rightSampleX = clampSampleCoordinate(
sampleX + 1,
terrain.sampleCountX - 1
);
const bottomSampleZ = clampSampleCoordinate(
sampleZ - 1,
terrain.sampleCountZ - 1
);
const topSampleZ = clampSampleCoordinate(sampleZ + 1, terrain.sampleCountZ - 1);
const topSampleZ = clampSampleCoordinate(
sampleZ + 1,
terrain.sampleCountZ - 1
);
const dxDenominator = Math.max(
(rightSampleX - leftSampleX) * terrain.cellSize,
Number.EPSILON
@@ -752,7 +759,10 @@ function pushTerrainLodBoundaryPoint(
) {
const previous = points[points.length - 1];
if (previous !== undefined && areTerrainLodSamplePointsEqual(previous, point)) {
if (
previous !== undefined &&
areTerrainLodSamplePointsEqual(previous, point)
) {
return;
}
@@ -844,16 +854,8 @@ function buildTerrainLodLevelMeshData(
stride: number,
options: TerrainMeshBuildOptions
): TerrainLodLevelMeshData {
const sampleXs = createLodSampleCoordinates(
startSampleX,
endSampleX,
stride
);
const sampleZs = createLodSampleCoordinates(
startSampleZ,
endSampleZ,
stride
);
const sampleXs = createLodSampleCoordinates(startSampleX, endSampleX, stride);
const sampleZs = createLodSampleCoordinates(startSampleZ, endSampleZ, stride);
const positions: number[] = [];
const uvs: number[] = [];
const layerWeights: number[] = [];
@@ -1307,29 +1309,23 @@ export function resolveTerrainLodLevelIndexWithHysteresis(options: {
const lowerBoundary =
activeLevelIndex <= 0
? Number.NEGATIVE_INFINITY
: TERRAIN_LOD_DISTANCE_MULTIPLIERS[activeLevelIndex - 1] ??
: (TERRAIN_LOD_DISTANCE_MULTIPLIERS[activeLevelIndex - 1] ??
TERRAIN_LOD_DISTANCE_MULTIPLIERS[
TERRAIN_LOD_DISTANCE_MULTIPLIERS.length - 1
]!;
]!);
const upperBoundary =
activeLevelIndex >= options.levelCount - 1
? Number.POSITIVE_INFINITY
: TERRAIN_LOD_DISTANCE_MULTIPLIERS[activeLevelIndex] ??
: (TERRAIN_LOD_DISTANCE_MULTIPLIERS[activeLevelIndex] ??
TERRAIN_LOD_DISTANCE_MULTIPLIERS[
TERRAIN_LOD_DISTANCE_MULTIPLIERS.length - 1
]!;
]!);
if (
normalizedDistance >
upperBoundary * (1 + TERRAIN_LOD_HYSTERESIS_RATIO)
) {
if (normalizedDistance > upperBoundary * (1 + TERRAIN_LOD_HYSTERESIS_RATIO)) {
return Math.min(activeLevelIndex + 1, options.levelCount - 1);
}
if (
normalizedDistance <
lowerBoundary * (1 - TERRAIN_LOD_HYSTERESIS_RATIO)
) {
if (normalizedDistance < lowerBoundary * (1 - TERRAIN_LOD_HYSTERESIS_RATIO)) {
return Math.max(activeLevelIndex - 1, 0);
}