void World::loadRegion(const PolyVox::ConstVolumeProxy<PolyVox::Material8>& volData, const PolyVox::Region& region) {
std::stringstream ss;
ss << "Info: loadRegion() is loading region: " << region.getLowerCorner() << " -> " << region.getUpperCorner();
Utils::log(ss.str());
uint8_t material = 2;
int lo_x = region.getLowerCorner().getX() +1;
int lo_y = region.getLowerCorner().getY() +1;
int lo_z = region.getLowerCorner().getZ() +1;
int hi_x = 7;
int hi_y = 3;
int hi_z = 7;
for (int x=lo_x; x<hi_x; ++x) {
for (int y=lo_y; y<hi_y; ++y) {
for (int z=lo_z; z<hi_z; ++z) {
PolyVox::Material8 voxel = volData.getVoxelAt(x,y,z);
voxel.setMaterial(material);
volData.setVoxelAt(x,y,z, voxel);
}
}
}
}
void VoxelTerrain::requestVolume(
const PolyVox::ConstVolumeProxy<BYTE>& volume,
const PolyVox::Region& region)
{
float interval = 1;
//std::cout << "Begin filling VoxelTerrain." << std::endl;
for (float z = region.getLowerCorner().getZ();
z <= region.getUpperCorner().getZ(); z+=interval) {
for (float y = region.getLowerCorner().getY();
y <= region.getUpperCorner().getY(); y+=interval) {
for (float x = region.getLowerCorner().getX();
x <= region.getUpperCorner().getX(); x+=interval) {
//std::cout << x/region.getUpperCorner().getX() << std::endl;
BYTE voxel_value = ground_cave_multiply.get(
5*x/region.getUpperCorner().getX(),
y/region.getUpperCorner().getY(),
5*z/region.getUpperCorner().getZ())*255;
// if (static_cast<double>(voxel_value) != 0)
// std::cout << static_cast<double>(voxel_value) << std::endl;
volume.setVoxelAt(x, y, z, voxel_value);
}
}
}
//std::cout << "Done filling VoxelTerrain." << std::endl;
}
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);
}
}
}
}
// This function encodes a Region as a 64-bit integer so that it can be used as a key to access chunk data in the SQLite database.
// A region actually contains more than 64-bits of data so some has to be lost here. Specifically we assume that we already know
// the size of the region (so we only have to encode it's lower corner and not its upper corner or extents), and we also restrict
// the range of valid coordinates. A Region's coordinates are represented by 3-bits of data, but we only support converting to a key
// if every coordinate can be represented by 21 bits of data. This way we can fit three coordinates only 63 bits of data. This limits
// the range of values to +/- 2^20, which is enough for our purposes.
uint64_t regionToKey(const PolyVox::Region& region)
{
// Cast to unsigned values so that bit shifting works predictably.
uint32_t x = static_cast<uint32_t>(region.getLowerX());
uint32_t y = static_cast<uint32_t>(region.getLowerY());
uint32_t z = static_cast<uint32_t>(region.getLowerZ());
// The magnitude of our input values is fairly restricted, but the values could stil be negative. This means the sign bit could
// be set and this needs to be encoded as well. We therefore perform a left rotate on the bits to bring the sign bit into the LSB.
x = rotateLeft(x);
y = rotateLeft(y);
z = rotateLeft(z);
// Now convert to 64-bits
uint64_t x64 = x;
uint64_t y64 = y;
uint64_t z64 = z;
// Morten-encode the components to give our final key
uint64_t result = EncodeMorton3(x64, y64, z64);
// Return the combined value
return result;
}
void LargeVoxelSphere::VoxelSpherePager::pageIn(
const PolyVox::Region& region,
PolyVox::PagedVolume<BYTE>::Chunk* chunk)
{
for (int z = region.getLowerCorner().getZ();
z <= region.getUpperCorner().getZ(); z++) {
for (int y = region.getLowerCorner().getY();
y <= region.getUpperCorner().getY(); y++) {
for (int x = region.getLowerCorner().getX();
x <= region.getUpperCorner().getX(); x++) {
PolyVox::Vector3DFloat current_pos(x,y,z);
PolyVox::Vector3DFloat volume_center(0,0,0);
float dist_to_center = (current_pos - volume_center).length();
BYTE voxel_value = 0;
if(dist_to_center <= 100) {
voxel_value = 255;
}
chunk->setVoxel(x, y, z, voxel_value);
}
}
}
}
virtual void pageOut(const PolyVox::Region& region, PagedVolume<MaterialDensityPair44>::Chunk* /*pChunk*/)
{
std::cout << "warning unloading region: " << region.getLowerCorner() << " -> " << region.getUpperCorner() << std::endl;
}
UBasicVolume::VolumeType* ImportMagicaVoxel(FArchive& Ar)
{
// https://voxel.codeplex.com/wikipage?title=Sample%20Codes
//auto* Result = new RawVolume(region);
//return Result;
const int MV_VERSION = 150;
const int ID_VOX = MV_ID('V', 'O', 'X', ' ');
const int ID_MAIN = MV_ID('M', 'A', 'I', 'N');
const int ID_SIZE = MV_ID('S', 'I', 'Z', 'E');
const int ID_XYZI = MV_ID('X', 'Y', 'Z', 'I');
const int ID_RGBA = MV_ID('R', 'G', 'B', 'A');
int32 magic;
int32 version;
// magic number
Ar << magic;
if (magic != ID_VOX)
{
UE_LOG(LogVoreealVolumeImporter, Warning, TEXT("magic number does not match"));
return nullptr;
}
// version
Ar << version;
if (version != MV_VERSION)
{
UE_LOG(LogVoreealVolumeImporter, Warning, TEXT("version does not match"));
return nullptr;
}
// main chunk
vox_chunk_t mainChunk;
ReadChunk(Ar, mainChunk);
if (mainChunk.id != ID_MAIN)
{
UE_LOG(LogVoreealVolumeImporter, Warning, TEXT("main chunk is not found"));
return nullptr;
}
bool isCustomPalette;
MV_RGBA palette[256];
MV_Voxel* voxels = nullptr;
int32 sizex = 0, sizey = 0, sizez = 0, numVoxels = 0;
while (!Ar.AtEnd())
{
// read chunk header
vox_chunk_t sub;
ReadChunk(Ar, sub);
if (sub.id == ID_SIZE)
{
// size
Ar << sizex << sizey << sizez;
}
else if (sub.id == ID_XYZI)
{
// numVoxels
Ar << numVoxels;
if (numVoxels < 0)
{
UE_LOG(LogVoreealVolumeImporter, Warning, TEXT("negative number of voxels"));
return nullptr;
}
// voxels
if (numVoxels > 0)
{
voxels = new MV_Voxel[numVoxels];
Ar.Serialize(voxels, sizeof(MV_Voxel) * numVoxels);
}
}
else if (sub.id == ID_RGBA)
{
// last color is not used, so we only need to read 255 colors
isCustomPalette = true;
Ar.Serialize(palette + 1, sizeof(MV_RGBA) * 255);
// NOTICE : skip the last reserved color
MV_RGBA reserved;
Ar.Serialize(&reserved, sizeof(MV_RGBA));
}
}
PolyVox::Region region;
region.setLowerCorner(PolyVox::Vector3DInt32(0, 0, 0));
region.setUpperCorner(PolyVox::Vector3DInt32(sizex, sizey, sizez));
auto* Result = new UBasicVolume::VolumeType(region);
for (int32 i = 0; i < numVoxels; i++)
{
auto voxel = voxels[i];
auto color = palette[voxel.colorIndex];
uint32 data =
(color.r) |
(color.g) << 8 |
(color.b) << 16 |
(color.a) << 24;
Result->setVoxel(voxel.x, voxel.y, voxel.z, data);
}
delete[] voxels;
//// print model info
//printf("[Log] MV_VoxelModel :: Model : %d %d %d : %d\n",
// sizex, sizey, sizez, numVoxels
// );
return Result;
}
void World::unloadRegion(const PolyVox::ConstVolumeProxy<PolyVox::Material8>& volData, const PolyVox::Region& region) {
std::stringstream ss;
ss << "Info: unloadRegion() is unloading region: " << region.getLowerCorner() << " -> " << region.getUpperCorner();
Utils::log(ss.str());
}