glTFLoader.Schema.Buffer CreateIndicesBuffer(Rhino.Geometry.Collections.MeshFaceList faces, out int indicesCount)
{
byte[] bytes = GetIndicesBytes(faces, out indicesCount);
return(new glTFLoader.Schema.Buffer()
{
Uri = Constants.TextBufferHeader + Convert.ToBase64String(bytes),
ByteLength = bytes.Length,
});
}
byte[] GetIndicesBytes(Rhino.Geometry.Collections.MeshFaceList faces, out int indicesCount)
{
//Preallocate to reduce time spent on allocations
List <uint> faceIndices = new List <uint>(faces.Count * 3);
foreach (Rhino.Geometry.MeshFace face in faces)
{
if (face.IsTriangle)
{
faceIndices.AddRange(new uint[] { (uint)face.A, (uint)face.B, (uint)face.C });
}
else
{
//Triangulate
faceIndices.AddRange(new uint[] { (uint)face.A, (uint)face.B, (uint)face.C, (uint)face.A, (uint)face.C, (uint)face.D });
}
}
IEnumerable <byte> bytesEnumerable = faceIndices.SelectMany(value => BitConverter.GetBytes(value));
indicesCount = faceIndices.Count;
return(bytesEnumerable.ToArray());
}
