/// <summary>
/// Converts a voxelgrid to a mesh hull.
/// TODO: Add hashmap vertex id > pixel/pixelface; to compute the pixel to which the mesh belongs.
/// </summary>
/// <param name="vg"></param>
/// <returns></returns>
public static Mesh VoxelGridToMesh(VoxelGrid3D vg)
{
Vector3d[] FaceDirections;
Vector3d[] AxisDirections;
Point3i[] RelativePosition;
int[,] FaceAxis;
double[] FaceSizes;
FaceDirections = new Vector3d[6] {
vg.BBox.Plane.XAxis, -vg.BBox.Plane.XAxis, vg.BBox.Plane.YAxis, -vg.BBox.Plane.YAxis, vg.BBox.Plane.ZAxis, -vg.BBox.Plane.ZAxis
};
AxisDirections = new Vector3d[3] {
vg.BBox.Plane.XAxis, vg.BBox.Plane.YAxis, vg.BBox.Plane.ZAxis
};
// the different faces
RelativePosition = new Point3i[6] {
new Point3i(1, 0, 0), new Point3i(-1, 0, 0), new Point3i(0, 1, 0), new Point3i(0, -1, 0), new Point3i(0, 0, 1), new Point3i(0, 0, -1)
};
FaceAxis = new int[3, 2] {
{ 1, 2 },
{ 2, 0 },
{ 0, 1 }
};
// the sizes of the faces
FaceSizes = new double[3] {
vg.SizeUVW.X, vg.SizeUVW.Y, vg.SizeUVW.Z
};
var m = new Mesh();
for (var i = 0; i < vg.Count; i++)
{
if (vg[i] == false)
{
continue;
}
for (var faceId = 0; faceId < 6; faceId++)
{
if (vg.GetRelativePointValue(i, RelativePosition[faceId]) != 1)
{
AddFacadeToMesh(vg, i, faceId, ref m, FaceDirections, AxisDirections, FaceAxis);
}
}
}
//m.Vertices.CombineIdentical(false, true);
m.Normals.ComputeNormals();
m.Compact();
return(m);
}
/// <summary>
/// Gets the voxelgrid mesh by plane
/// Return a seperate list for each face direction
/// </summary>
/// <param name="vg"></param>
/// <returns></returns>
public static List <Mesh> VoxelGridToMeshByPlanes(VoxelGrid3D vg)
{
Vector3d[] FaceDirections;
Vector3d[] AxisDirections;
Point3i[] RelativePosition;
int[,] FaceAxis;
double[] FaceSizes;
var Meshes = new List <Mesh>();
for (var i = 0; i < 6; i++)
{
Meshes.Add(new Mesh());
}
FaceDirections = new Vector3d[6] {
vg.BBox.Plane.XAxis, -vg.BBox.Plane.XAxis, vg.BBox.Plane.YAxis, -vg.BBox.Plane.YAxis, vg.BBox.Plane.ZAxis, -vg.BBox.Plane.ZAxis
};
AxisDirections = new Vector3d[3] {
vg.BBox.Plane.XAxis, vg.BBox.Plane.YAxis, vg.BBox.Plane.ZAxis
};
// the different faces
RelativePosition = new Point3i[6] {
new Point3i(1, 0, 0), new Point3i(-1, 0, 0), new Point3i(0, 1, 0), new Point3i(0, -1, 0), new Point3i(0, 0, 1), new Point3i(0, 0, -1)
};
FaceAxis = new int[3, 2] {
{ 1, 2 },
{ 2, 0 },
{ 0, 1 }
};
// the sizes of the faces
FaceSizes = new double[3] {
vg.SizeUVW.X, vg.SizeUVW.Y, vg.SizeUVW.Z
};
for (var i = 0; i < vg.Count; i++)
{
if (vg[i] == false)
{
continue;
}
for (var faceId = 0; faceId < 6; faceId++)
{
var m = Meshes[faceId];
if (vg.GetRelativePointValue(i, RelativePosition[faceId]) != 1)
{
try
{
AddFacadeToMesh(vg, i, faceId, ref m, FaceDirections, AxisDirections, FaceAxis);
}
catch (Exception e)
{
throw new Exception(
$"Adding Facade {faceId} of Voxel {i} to Mesh failed: {e.ToString()}");
}
}
}
}
//m.Vertices.CombineIdentical(false, true);
for (var i = 0; i < 6; i++)
{
Meshes[i].Normals.ComputeNormals();
Meshes[i].Compact();
}
return(Meshes);
}