I have an odd stereo rendering pipeline where I need to pass left and right images rendered at 2K to a weaver object, and then display the weaver output at 4K. Thus I want my final render window to be 4K in size, but I want to utilize offscreen rendering to create two 2K images.
Currently it seems like the offscreen buffer is always the same size as the render window. If I want my offscreen buffers to be rendered correct at 2K, I have to set the size of my render window to 2K. But then I end up only being able to see a quarter of the final image that I want. Similarly, if I keep my render window at 4K, I have not figured out how to properly render my left/right images at 2K rather than 4K.
Is there a way to define the size of the render output besides setting the size of the render window?