private Float64Vector[][] fromNormalMap(NormalMap source) {
Float64Vector[][] normals = new Float64Vector[16][16];
Coordinate chunkOrigin = location.zoomIn(Coordinate.OFFSET_BLOCK_CHUNK);
for (int x = 0; x < 16; x++) {
for (int y = 0; y < 16; y++) {
normals[x][y] =
source.getNormal(chunkOrigin.plus(new Coordinate(x, y, Coordinate.LEVEL_BLOCK)));
}
}
return normals;
}
private static double computeDiffuseShading(
ChunkSnapshot chunkSnapshot, int x, int z, NormalMap nm) {
Float64Vector n =
nm.getNormal(
Coordinate.fromSnapshot(chunkSnapshot)
.zoomIn(Coordinate.OFFSET_BLOCK_CHUNK)
.plus(new Coordinate(x, z, Coordinate.LEVEL_BLOCK)));
Float64Vector light = Float64Vector.valueOf(-1, -1, -1);
if (n == null) {
return -1;
}
double shading = n.times(light).divide((n.norm().times(light.norm()))).doubleValue();
return ((shading + 1) * 0.4) + 0.15;
}