I'm sure this has been discussed to death... it's at least bugged me for many, many years, but I'm still unable to figure out any good solution...
The problem; I want a Corona sky to illuminate my interior scene. BUT I want a custom (site-specific) 360 panorama to be visible in the background.
Obviously I can set the Corona Sky as my background, and the HDRI as overrides.
First problem; the weird Corona bug with noisy renders when reflect environment override is in use. Is this fixed yet? Is it close to being fixed? This seems like a pretty major problem...
Problem #2: If I want to 'edit' the background once the render is complete, I run into problems. Obviously I can save my render as *.cxr and export out the image as PNG with alpha background on. This allows me to put a custom background pic into the image in photoshop behind my big glass windows. The problem is that I lose a lot of detail in the reflections of the glass. I get matting on the sides of the window frames (and other objects that are infront of the glass windows). So I can't easily 'paste' in a background.
So, my only option left is to render in the background plates for clean, custom views out of my window. But this solution, of course, allows for no flexibility in editing my background after rendering.
Is this clear? Do others experience this paradox? Is there a solution I'm unaware of?
Many thanks for any input...