private static CullingFaces CalcCullingFaces(VoxelData voxels, int x, int y, int z)
{
var r = CullingFaces.All;
if (!voxels.GetVoxel(x + 1, y, z).IsSolid)
{
r -= CullingFaces.East;
}
if (!voxels.GetVoxel(x - 1, y, z).IsSolid)
{
r -= CullingFaces.West;
}
if (!voxels.GetVoxel(x, y, z - 1).IsSolid)
{
r -= CullingFaces.South;
}
if (!voxels.GetVoxel(x, y, z + 1).IsSolid)
{
r -= CullingFaces.North;
}
if (!voxels.GetVoxel(x, y - 1, z).IsSolid)
{
r -= CullingFaces.Down;
}
if (!voxels.GetVoxel(x, y + 1, z).IsSolid)
{
r -= CullingFaces.Up;
}
return(r);
}
public static ThreadableMesh Build(VoxelData voxels)
{
List <Vector3> vertices = new List <Vector3>();
List <int> triangles = new List <int>();
int triIndex = 0;
for (int y = 0; y < voxels.Height; y++)
{
for (int z = 0; z < voxels.Depth; z++)
{
for (int x = 0; x < voxels.Width; x++)
{
var voxel = voxels.GetVoxel(x, y, z);
if (voxel.Color.a == 0)
{
continue;
}
// build
var cullingFaces = CalcCullingFaces(voxels, x, y, z);
if (cullingFaces == CullingFaces.All)
{
continue;
}
vertices.AddRange(MakeVertices(cullingFaces, x, y, z));
triangles.AddRange(MakeTriangles(cullingFaces, ref triIndex));
}
}
}
var mesh = new ThreadableMesh();
mesh.Vertices = vertices.ToArray();
mesh.Triangles = triangles.ToArray();
return(mesh);
}