Sphere Primitive

The sphere primitive is now essentially complete. It still has some problems with normals, but I suspect that is actually caused by the normal calculation, rather than the sphere primitive itself. All of the primitives have this problem. It is one of the first bugs that will need to be addressed.

Below is a screenshot of the sphere primitive. At the same time, I decided to add in a lot of polygons to see how much it could handle. It seemed to work just fine, though I have a decent graphics card, which might explain why. This sphere has over 2000 polygons, which I suppose isn't an extremely large amount, but it is enough that I feel safe claiming The Forge can handle small models just fine.