My old ray tracer could do arbitrary quadric surfaces, toroids with 2 minor radii, and CSG of all those. Triangles too (no CSG). It was getting kind of fast 20

My old ray tracer could do arbitrary quadric surfaces, toroids with 2 minor radii, and CSG of all those. Triangles too (no CSG). It was getting kind of fast 20 years ago - 10fps at 1024x768. Never had good shading though. I should dig that up and add NURBS and see how it performs today.