void createHeightmapInVolume(Volume<MaterialDensityPair44>* volData, float* heightmap, int width, int height)
{
//This vector hold the position of the center of the volume
Vector3DFloat v3dVolCenter(volData->getWidth() / 2, volData->getHeight() / 2, volData->getDepth() / 2);
//This three-level for loop iterates over every voxel in the volume
for (int z = 0; z < volData->getWidth(); z++)
{
for (int x = 0; x < volData->getDepth(); x++)
{
float height = volData->getHeight()-1;
height *= heightmap[x+z*width];
int h = int(height);
if(h < 1) h = 1;
for (int y = 0; y < h; y++) {
Vector3DFloat v3dCurrentPos(x,y,z);
uint8_t uDensity = MaterialDensityPair44::getMaxDensity();
MaterialDensityPair44 voxel = volData->getVoxelAt(x,y,z);
voxel.setDensity(uDensity);
volData->setVoxelAt(x, y, z, voxel);
}
}
}
}
virtual void pageIn(const PolyVox::Region& region, PagedVolume<MaterialDensityPair44>::Chunk* pChunk)
{
Perlin perlin(2, 2, 1, 234);
for (int x = region.getLowerX(); x <= region.getUpperX(); x++)
{
for (int y = region.getLowerY(); y <= region.getUpperY(); y++)
{
float perlinVal = perlin.Get(x / static_cast<float>(255 - 1), y / static_cast<float>(255 - 1));
perlinVal += 1.0f;
perlinVal *= 0.5f;
perlinVal *= 255;
for (int z = region.getLowerZ(); z <= region.getUpperZ(); z++)
{
MaterialDensityPair44 voxel;
if (z < perlinVal)
{
const int xpos = 50;
const int zpos = 100;
if ((x - xpos)*(x - xpos) + (z - zpos)*(z - zpos) < 200)
{
// tunnel
voxel.setMaterial(0);
voxel.setDensity(MaterialDensityPair44::getMinDensity());
}
else
{
// solid
voxel.setMaterial(245);
voxel.setDensity(MaterialDensityPair44::getMaxDensity());
}
}
else
{
voxel.setMaterial(0);
voxel.setDensity(MaterialDensityPair44::getMinDensity());
}
// Voxel position within a chunk always start from zero. So if a chunk represents region (4, 8, 12) to (11, 19, 15)
// then the valid chunk voxels are from (0, 0, 0) to (7, 11, 3). Hence we subtract the lower corner position of the
// region from the volume space position in order to get the chunk space position.
pChunk->setVoxel(x - region.getLowerX(), y - region.getLowerY(), z - region.getLowerZ(), voxel);
}
}
}
}