After a lot of testing to work out the best way to get the CGI hanger interior scene out of C4D into Shake, all is now done.
Used the Standard Renderer as didn't really see a major difference between that and the Physical Renderer. May change that later.(!) Rendered two passes in the end. The hanger interior on its own as a multi pass render with a Blend channel housing ever pass except Ambient Occlasion and Shadows. These kept separate so I can adjust in Shake. Each object within the hanger had the 'Seen by camera' tag unchecked so that they produced shadows etc but did not render out.
Second render was all the objects within the hanger, each with their own Object Buffer to produce separate alpha channels. The hanger interior was included in the render but the compositing tag had 'seen by camera' unchecked.
Brought both final renders into photoshop to produce one file for Shake. Each object is on a separate layer including the hanger interior itself; a separate layer for the casting shadows and Ambient O; and a separate layer for the objects own internal shadows and ambient o.
Made sure the file was 8 bit and imported the Photoshop file into Shake. Opens with all the layers as separate nodes; joined together by a Compositing node ( basically a multi layer node).
Added a Radial Grad node - resized and reduced opacity to give the hanger some atmosphere and to help with depth. Reduced the saturation of the canisters at the back of he hanger, again to help with depth.
Added a very low overal blur node and tested a very faint film noise node and it's definately getting there!
Blur the back canisters and the back wall of the hanger slightly to help more with depth.
Add some smoke from the shuttle using some real footage clips
Start keying out the 'extras' and placing them in the scene.
At the moment the scene is barely 13 frames - half a second long - think I might change that to at least a 1 second to give it some 'air' and for people to acknowledge it.
Overall colour correction won't happen until everything is together which includes the foreground actors. May rotoscope these as they don't move much as keying is proving a little difficult!