public double calcDensity(int x, int y, int z) {
double height = calcBaseTerrain(x, z);
double ocean = calcOceanTerrain(x, z);
double river = calcRiverTerrain(x, z);
float temp = biomeProvider.getTemperatureAt(x, z);
float humidity = biomeProvider.getHumidityAt(x, z);
Vector2f distanceToMountainBiome = new Vector2f(temp - 0.25f, humidity - 0.35f);
double mIntens = TeraMath.clamp(1.0 - distanceToMountainBiome.length() * 3.0);
double densityMountains = calcMountainDensity(x, y, z) * mIntens;
double densityHills = calcHillDensity(x, y, z) * (1.0 - mIntens);
int plateauArea = (int) (Chunk.SIZE_Y * 0.10);
double flatten = TeraMath.clamp(((Chunk.SIZE_Y - 16) - y) / plateauArea);
return -y
+ (((32.0 + height * 32.0) * TeraMath.clamp(river + 0.25) * TeraMath.clamp(ocean + 0.25))
+ densityMountains * 1024.0
+ densityHills * 128.0)
* flatten;
}
@Override
public void generateChunk(Chunk c) {
double[][][] densityMap = new double[Chunk.SIZE_X + 1][Chunk.SIZE_Y + 1][Chunk.SIZE_Z + 1];
/*
* Create the density map at a lower sample rate.
*/
for (int x = 0; x <= Chunk.SIZE_X; x += SAMPLE_RATE_3D_HOR) {
for (int z = 0; z <= Chunk.SIZE_Z; z += SAMPLE_RATE_3D_HOR) {
for (int y = 0; y <= Chunk.SIZE_Y; y += SAMPLE_RATE_3D_VERT) {
densityMap[x][y][z] = calcDensity(c.getBlockWorldPosX(x), y, c.getBlockWorldPosZ(z));
}
}
}
/*
* Trilinear interpolate the missing values.
*/
triLerpDensityMap(densityMap);
/*
* Generate the chunk from the density map.
*/
for (int x = 0; x < Chunk.SIZE_X; x++) {
for (int z = 0; z < Chunk.SIZE_Z; z++) {
WorldBiomeProvider.Biome type =
biomeProvider.getBiomeAt(c.getBlockWorldPosX(x), c.getBlockWorldPosZ(z));
int firstBlockHeight = -1;
for (int y = Chunk.SIZE_Y; y >= 0; y--) {
if (y == 0) { // The very deepest layer of the world is an indestructible mantle
c.setBlock(x, y, z, BlockManager.getInstance().getBlock("MantleStone"));
break;
}
if (y <= 32 && y > 0) { // Ocean
c.setBlock(x, y, z, BlockManager.getInstance().getBlock("Water"));
c.setLiquid(x, y, z, new LiquidData(LiquidType.WATER, Chunk.MAX_LIQUID_DEPTH));
if (y == 32) {
// Ice layer
if (type == WorldBiomeProvider.Biome.SNOW)
c.setBlock(x, y, z, BlockManager.getInstance().getBlock("Ice"));
}
}
double dens = densityMap[x][y][z];
if ((dens >= 0 && dens < 32)) {
// Some block was set...
if (firstBlockHeight == -1) firstBlockHeight = y;
if (calcCaveDensity(c.getBlockWorldPosX(x), y, c.getBlockWorldPosZ(z)) > -0.7)
GenerateOuterLayer(x, y, z, firstBlockHeight, c, type);
else c.setBlock(x, y, z, air);
continue;
} else if (dens >= 32) {
// Some block was set...
if (firstBlockHeight == -1) firstBlockHeight = y;
if (calcCaveDensity(c.getBlockWorldPosX(x), y, c.getBlockWorldPosZ(z)) > -0.6)
GenerateInnerLayer(x, y, z, c, type);
else c.setBlock(x, y, z, air);
continue;
}
// Nothing was set!
firstBlockHeight = -1;
}
}
}
}