Currently I cant do this in Enscape because I don't know of a way to override all materials so that I can export out only line-work. This allows me to composite the two in post production using a multiply layer, and then control the visibility of the line-work or remove it completely. Essentially I export a simple black line over white background. The next most important channel or element that I use is a line-work pass (usually out of SketchUp). I see it as being as simple as automatically generating random contrasting colors for each type of material and just having the option to export it out when you render. Either way this is very useful in post production. The other way to do this is in V-Ray, by rendering out the Material ID channel. This gives be a pretty decent faux-Material ID pass to work on when compositing images. This can be done in one of two ways The first is in SketchUp, and is done by setting the view port render too only show colors, not textures, and turn off line-work and shadows. The most important channel is the Material ID channel, because i allows me to quickly select a color in post production to adjust or edit a material/texture after the render. Alpha Channel (provided upon render export).So, in my typical workflow I need specifically 3 channels to do post production work.
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