This script allows you to have multiple viewports on your HUD and also let you render it to a texture, e.g. for a security camera.
The quality depends on the texture size you use. If your texture has the same dimension as your actual screen resolution it would give you a mirror without loss of quality, but of course it would kill your framerates (you have to move too much data every frame).
For the videos i used a 256*256 (A8R8G8B8) texture for rendering, which should be the best solution for a "TV" without loosing too much performance. I actually use some tricks to improve performance, but keep in mind that Crysis itself is a framekiller, even on high-end machines, so texture rendering and multiple viewports will be at least a framekiller*2
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