Bloom and Spot Rendering

MelissaGT

Hi there - 

Part of my normal process when putting a scene together is to perform one single render along with numerous spot renders to fix things here and there (such as poke-through or switching collision sources - his hand touching her, then her hand touching him, etc) and compiling them all together in Photoshop to get one final product. It would take forever if I had to re-do the render in full each time I wanted to tweak only some small part of it, so spot rendering is great. However, I've recently begun to experiment with the bloom filter and have gotten some pretty awesome results with it. The problem is that I can't seem to use spot rendering with a strong bloom filter because the lighting ends up looking completely different in the spot render. Is there a way around this, or would I have to render the scene in full each time in order to only change a small piece? I know some people render lighting/shadows into multiple layers and merge them in post, but I'm not sure that's a solution here because I'm changing and moving actual obejects each time.

I've attached a couple renders to show as an example, the first being the biggest culprit. I had to process out the render in full probably five or six times, each with a different layer...fixing the poke-through on the jacket/shirt/pants, dust/sand geoshell on the bike, etc etc and it took forever because I was rendering the scene out at a fairly large size (3151 x 4096) each time (and my 1080TI system is no slouch). Because of the bloom filter, spot renders didn't work as they ended up with completely different lighting and couldn't be layered into the scene properly with Photoshop.