Is it possible to render say a 320x240 window at 640x480 and just double up the pixels? I'm going for a retro feel; In flash I just render everything to a Bitmap object and scale it up; was thinking it might be possible to somehow "render" to a Texture/Mesh (still learning unity sorry) and then just scale that up...
Any texture that you want to look like that, just use Point filtering. I don't have Unity Pro, so don't have experience with Render Textures, but I assume that would work. What is the exact effect, here? You want to use 3D models, but have their edges sampled at a frequency much lower than what the screen resolution offers?