I need to post-process the first render target and output to another one, therefore no triangles, no scene, and no camera is needed, so how can I setup the renderer?
There are three passes:
Render a scene with a camera to render_target_A.
Process render_target_A and output to render_target_B.
Process render_target_A and render_target_B and output to screen.
My question is about the second pass.