是否有3D WPF对象的(免费)工具或库?

I wanted to play around with some 3D controls in WPF, but was mildly surprised to find that there were no primitive solid controls in WPF - I just wanted to plop a few spheres and cubes in a scene, but didn't realize I had to render them using meshes.I wanted to play around with some 3D controls i