public void LoadMesh(Mesh mesh, Matrix4x4 transform)
{
UnloadMesh(mesh);
var textureCoords = mesh.TextureCoordinateChannelCount > 0
? mesh.TextureCoordinateChannels[0].Select(uv => uv.AsUvPoint())
: null;
var triangleIndices = new List<int>(mesh.FaceCount * 4);
foreach (var face in mesh.Faces)
{
triangleIndices.Add(face.Indices[0]);
triangleIndices.Add(face.Indices[1]);
triangleIndices.Add(face.Indices[2]);
if (face.IndexCount == 4)
{
triangleIndices.Add(face.Indices[0]);
triangleIndices.Add(face.Indices[2]);
triangleIndices.Add(face.Indices[3]);
}
if (face.IndexCount > 4)
{
Debug.WriteLine($"Found {face.IndexCount}gon, only generating quad");
}
}
var geometry = new MeshGeometry3D
{
Positions = new Point3DCollection(
mesh.Vertices.Select(v => new Point3D(v.X, v.Y, v.Z))),
Normals = new Vector3DCollection(
mesh.Normals.Select(n => new Vector3D(n.X, n.Y, n.Z))),
TriangleIndices = new Int32Collection(triangleIndices),
TextureCoordinates = textureCoords != null ? new PointCollection(textureCoords) : null
};
var diffuse = _textureProvider.GetTexture(mesh, TextureType.Diffuse);
// the ViewPortUnits is very important, or the brush will map MaxU x MaxV to 1 x 1
// see https://books.google.no/books?id=ubgRAAAAQBAJ&pg=PA582&lpg=PA582
// TileMode also seems necessary
var brush = diffuse != null
? new ImageBrush(diffuse)
{
ViewportUnits = BrushMappingMode.Absolute,
TileMode = TileMode.Tile
}
: (Brush) Brushes.Pink;
// because reasons?
transform = Matrix4x4.Transpose(transform);
var geometryModel = new GeometryModel3D
{
Material = new MaterialGroup
{
Children = new MaterialCollection
{
new DiffuseMaterial(brush),
}
},
Geometry = geometry,
};
var group = new Model3DGroup()
{
Transform = transform.ToTransform3D(),
};
group.Children.Add(geometryModel);
_meshModelGroup.Children.Add(group);
var (wireFrame, wireFrameGeometry) = CreateWireFrame(mesh);
wireFrame.Transform = transform.ToTransform3D();
_wireFrameModelGroup.Children.Add(wireFrame);
_meshes[mesh] = new MeshEntry(group, wireFrame, geometry, wireFrameGeometry);
}
