By 3dtrialpractice - Thu Dec 23, 2010 6:10 pm
You could possibly do that and change colors, but would be hard when we talk about changing material roughness, things that changes the "light patterns" like caustics.... just guessing
One workaround today would be to render each material desaturated and use material id to change the colors in photoshop / nuke.
But the problem and solution I can see with reflections, is that you would need to render a separate image for each material and stack em up in layers in photoshop / nuke.

- By Mark Bell