Mixing renders

Does anyone know how to mix 2 (or more) renders together? My computer can’t render the hole .blend-file, so maybe it’s possible to make a bit of it, then make an other bit of it, and so on. And in the end put them together, so I get the hole picture in 1 piece. Is this possible at any way?

J_M_D:

I’ve just renderd your image - the solution is to use an octree resolution of 512 - I just posted the solution in your older thread.

Year I know, but it still don’t work for me :frowning:

PostProcess, render using alpha on the parts.