It's been a year (pretty much precisely) since I took a look at this. I see you've moved the color depth and dithering into postprocessing. It's now far more accurate as a result, but now we have lost the ability to dither only certain materials in our scene.
I'm guessing there was no way to get an accurate reduction in color depth without using postprocessing?
IIRC it was accurate dithering that led to moving it to a post process effect rather than object-level (had issues dithering between colours, and didn’t play nicely with transparency).
Wasn’t overly happy with cutting per-object dithering, but it was a relatively obscure hardware feature to begin with (so far you’re the first person to bring it up). Hopefully we’ll be able to get it back in 4.0 by rendering to a buffer to mask dithering, AFAIK that should do the job.
