I noticed there's no primitive mesh.
It will be a little bit complex to code some tutorials or trick'n tips examples.
MeshData is not a user-friendly command for me.
That's right, I also think that's missing badly. Box, Sphere (Cylinder, Cone..)
And I'm sure its easy to implement these basic 'predefined meshes'.
(They would be useful for the Documentation, too. 3d Sample-Code not needing any resources..)