I am writing a 2D game and I was using sprite batch and all was workign well but then I added some textured quads (within 3D space) and now I get a random spritebatch null exception. Spritebatch will draw for awhile before that occurs. I can't figure out why it might be doing this. Is it not a good idea to mix like this? Should I do my spriteBatch before or after my other drawing?