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Refactor terrain resampling to calculate source coordinates based on target position

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This commit is contained in:
Victor Giers
2026-05-13 14:09:55 +02:00
parent 419e125ca0
commit 215569cf96
1 changed files with 100 additions and 12 deletions
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112
src/document/terrains.ts
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@@ -1350,19 +1350,74 @@ function getTerrainSampleCountForFootprint(
);
}
function getTerrainPositionForResize(
terrain: Terrain,
sampleCountX: number,
sampleCountZ: number,
cellSize: number,
resizeDirectionX: TerrainGridResizeDirectionX,
resizeDirectionZ: TerrainGridResizeDirectionZ
): Vec3 {
const oldMaxX = terrain.position.x + getTerrainFootprintWidth(terrain);
const oldMaxZ = terrain.position.z + getTerrainFootprintDepth(terrain);
const nextWidth = (sampleCountX - 1) * cellSize;
const nextDepth = (sampleCountZ - 1) * cellSize;
return {
x:
resizeDirectionX === "west"
? oldMaxX - nextWidth
: terrain.position.x,
y: terrain.position.y,
z:
resizeDirectionZ === "south"
? oldMaxZ - nextDepth
: terrain.position.z
};
}
function getTerrainSourceSampleX(
terrain: Terrain,
nextPosition: Vec3,
sampleX: number,
cellSize: number
): number {
return (nextPosition.x + sampleX * cellSize - terrain.position.x) / terrain.cellSize;
}
function getTerrainSourceSampleZ(
terrain: Terrain,
nextPosition: Vec3,
sampleZ: number,
cellSize: number
): number {
return (nextPosition.z + sampleZ * cellSize - terrain.position.z) / terrain.cellSize;
}
function createLocalPositionResampledTerrainHeights(
terrain: Terrain,
sampleCountX: number,
sampleCountZ: number,
cellSize: number
cellSize: number,
nextPosition: Vec3
): number[] {
const heights = new Array<number>(sampleCountX * sampleCountZ);
for (let sampleZ = 0; sampleZ < sampleCountZ; sampleZ += 1) {
const sourceSampleZ = (sampleZ * cellSize) / terrain.cellSize;
const sourceSampleZ = getTerrainSourceSampleZ(
terrain,
nextPosition,
sampleZ,
cellSize
);
for (let sampleX = 0; sampleX < sampleCountX; sampleX += 1) {
const sourceSampleX = (sampleX * cellSize) / terrain.cellSize;
const sourceSampleX = getTerrainSourceSampleX(
terrain,
nextPosition,
sampleX,
cellSize
);
heights[sampleZ * sampleCountX + sampleX] =
sampleTerrainHeightAtGridCoordinate(
@@ -1380,7 +1435,8 @@ function createLocalPositionResampledTerrainPaintWeights(
terrain: Terrain,
sampleCountX: number,
sampleCountZ: number,
cellSize: number
cellSize: number,
nextPosition: Vec3
): number[] {
const storedWeightCount = getTerrainStoredPaintWeightCount(
terrain.layers.length
@@ -1390,10 +1446,20 @@ function createLocalPositionResampledTerrainPaintWeights(
);
for (let sampleZ = 0; sampleZ < sampleCountZ; sampleZ += 1) {
const sourceSampleZ = (sampleZ * cellSize) / terrain.cellSize;
const sourceSampleZ = getTerrainSourceSampleZ(
terrain,
nextPosition,
sampleZ,
cellSize
);
for (let sampleX = 0; sampleX < sampleCountX; sampleX += 1) {
const sourceSampleX = (sampleX * cellSize) / terrain.cellSize;
const sourceSampleX = getTerrainSourceSampleX(
terrain,
nextPosition,
sampleX,
cellSize
);
const offset = (sampleZ * sampleCountX + sampleX) * storedWeightCount;
for (
@@ -1419,17 +1485,28 @@ function createLocalPositionResampledTerrainFoliageMasks(
terrain: Terrain,
sampleCountX: number,
sampleCountZ: number,
cellSize: number
cellSize: number,
nextPosition: Vec3
): TerrainFoliageMaskRegistry {
return Object.fromEntries(
Object.entries(terrain.foliageMasks).map(([layerId, mask]) => {
const values = new Array<number>(sampleCountX * sampleCountZ);
for (let sampleZ = 0; sampleZ < sampleCountZ; sampleZ += 1) {
const sourceSampleZ = (sampleZ * cellSize) / terrain.cellSize;
const sourceSampleZ = getTerrainSourceSampleZ(
terrain,
nextPosition,
sampleZ,
cellSize
);
for (let sampleX = 0; sampleX < sampleCountX; sampleX += 1) {
const sourceSampleX = (sampleX * cellSize) / terrain.cellSize;
const sourceSampleX = getTerrainSourceSampleX(
terrain,
nextPosition,
sampleX,
cellSize
);
values[sampleZ * sampleCountX + sampleX] =
sampleTerrainFoliageMaskAtGridCoordinate(
@@ -1457,15 +1534,26 @@ function createLocalPositionResampledTerrainFoliageBlockerMask(
terrain: Terrain,
sampleCountX: number,
sampleCountZ: number,
cellSize: number
cellSize: number,
nextPosition: Vec3
): TerrainFoliageBlockerMask {
const values = new Array<number>(sampleCountX * sampleCountZ);
for (let sampleZ = 0; sampleZ < sampleCountZ; sampleZ += 1) {
const sourceSampleZ = (sampleZ * cellSize) / terrain.cellSize;
const sourceSampleZ = getTerrainSourceSampleZ(
terrain,
nextPosition,
sampleZ,
cellSize
);
for (let sampleX = 0; sampleX < sampleCountX; sampleX += 1) {
const sourceSampleX = (sampleX * cellSize) / terrain.cellSize;
const sourceSampleX = getTerrainSourceSampleX(
terrain,
nextPosition,
sampleX,
cellSize
);
values[sampleZ * sampleCountX + sampleX] =
sampleTerrainFoliageBlockerMaskAtGridCoordinate(