private Vector3?GetCellValue(Vector3Int pos)
{
var dx = pos.x - voxelData.gridSize[0];
var dy = pos.y - voxelData.gridSize[1];
var dz = pos.z - voxelData.gridSize[2];
if (dx < 0 && dy < 0 && dz < 0)
{
var flat = TreeUtility.Flatten(pos, voxelData.gridSize);
return(voxelData.cells.TryGetValue(flat, out var val) ? val : (Vector3?)null);
}
var neighborOffset = new Vector3Int(Math.Max(dx + 1, 0), Math.Max(dy + 1, 0), Math.Max(dz + 1, 0));
var neighborData = NeighborData[neighborOffset];
if (neighborData.cells.Count == 0)
{
return(null);
}
var nPos = (Vector3Int.one - neighborOffset) * pos;
var nFlat = TreeUtility.Flatten(nPos, neighborData.gridSize);
return(neighborData.cells.TryGetValue(nFlat, out var nVal) ? nVal : (Vector3?)null);
}
public static SignedDistanceFieldData Generate(GameObject obj, ComputeShader cs, Vector3Int resolution, Bounds bounds, float step)
{
var width = resolution.x;
var height = resolution.y;
var depth = resolution.z;
var meshFilters = obj.GetComponentsInChildren <MeshFilter>();
var voxelRes = new[] { width, height, depth };
var resVoxels = new bool[width][][];
for (var i = 0; i < width; ++i)
{
resVoxels[i] = new bool[height][];
for (var j = 0; j < height; ++j)
{
resVoxels[i][j] = new bool[depth];
}
}
foreach (var meshFilter in meshFilters)
{
Voxelize(meshFilter, bounds, resolution, step, resVoxels);
}
var count = width * height * depth;
var bufferCpu = new float[count];
for (var x = 0; x < width; ++x)
{
for (var z = 0; z < depth; ++z)
{
var filled = false;
for (var y = height - 1; y >= 0; --y)
{
var full = resVoxels[x][y][z] || filled;
if (!filled && full)
{
filled = true;
}
var pos = TreeUtility.Flatten(x, y, z, voxelRes);
bufferCpu[pos] = full ? 1f : 0f;
}
}
}
var buffer = new ComputeBuffer(count, sizeof(float));
buffer.SetData(bufferCpu);
var texture = new RenderTexture(width, height, 0, RenderTextureFormat.R8, RenderTextureReadWrite.Default)
{
dimension = TextureDimension.Tex3D,
volumeDepth = depth,
enableRandomWrite = true,
wrapMode = TextureWrapMode.Clamp
};
texture.Create();
var initializeKernel = cs.FindKernel("Initialize");
cs.SetTexture(initializeKernel, "_Texture", texture);
cs.SetBuffer(initializeKernel, "_VoxelBuffer", buffer);
cs.SetVector("_TexSize", new Vector4(width, height, depth, 0f));
cs.Dispatch(initializeKernel, HDRPUtilities.GetGroupSize(width, 8),
HDRPUtilities.GetGroupSize(height, 8), HDRPUtilities.GetGroupSize(depth, 8));
buffer.Dispose();
return(new SignedDistanceFieldData()
{
texture = texture,
bounds = bounds,
voxels = resVoxels,
step = step
});
}