private void CalculateTangents(GpuMesh mesh)
{
foreach (var bufferAndPrimitives in mesh.GroupPrimitives())
{
var bufferView = bufferAndPrimitives.BufferView;
if (bufferView.GetStream(StreamKey.TexCoord0) == null)
{
continue;
}
throw new NotImplementedException();
}
//if (mesh.GetStream(StreamKey.TexCoord0) == null)
//{
// return;
//}
//var tangents = new ArrayMeshStream<Vector3>(mesh.Count, mesh.GetStream(StreamKey.Position).ConverterFactory);
//mesh.SetStream(StreamKey.Tangent, tangents);
//foreach (var submesh in mesh.Submeshes)
//{
// switch (submesh.VertexSourceType)
// {
// case VertexSourceType.Triangles:
// CalculateTangentsForTriangles(mesh, submesh, tangents);
// break;
// case VertexSourceType.Points:
// case VertexSourceType.Lines:
// case VertexSourceType.LineLoop:
// case VertexSourceType.LineStrip:
// break;
// default:
// throw new NotImplementedException(submesh.VertexSourceType.ToString());
// }
//}
//for (var index = 0; index < tangents.Count; index++)
//{
// var tangent = tangents[index];
// var l = tangent.LengthSquared;
// if (l < 1e-6f)
// {
// tangents[index] = Vector3.UnitX;
// }
// else
// {
// tangents[index] = tangent * (1.0f / (float)Math.Sqrt(l));
// }
//}
}
private IEnumerable <IMesh> PaintSingleStreamMesh(GpuMesh mesh)
{
foreach (var bufferAndPrimitives in mesh.GroupPrimitives())
{
var bufferView = bufferAndPrimitives.BufferView;
if (bufferView.GetStream(StreamKey.Color) != null)
{
continue;
}
var meshStream = bufferView.GetStream(StreamKey.Position);
var streamConverterFactory = meshStream.ConverterFactory;
var colors = new Vector4[meshStream.Count];
new Span <Vector4>(colors).Fill(_color);
var arrayMeshStream = new ArrayMeshStream <Vector4>(colors, streamConverterFactory);
bufferView.SetStream(StreamKey.Color, arrayMeshStream);
}
yield return(mesh);
}