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mbreymann is Offline
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Join Date: Oct 2009
Location: San Francisco
Default 08-21-2012, 01:15 PM

This is something I struggled with for a long time...then I wrote my own tools, which started out a few years ago simply as mental ray shaders that blended multiple projections together based on painted mattes, geometry occlusion, facing ratio, etc. The tools progressed over the years to include a UI that minimized the iterative tasks of setting up the shading networks, and extended the capabilities of Maya's viewport feedback (among other things.)

I released the tools as a plugin suite under the name the Mattepainting Toolkit for Maya, which you can find here:

www.glyphfx.com/mptk.html

Though the tools aren't free, the most recent release from a couple weeks ago has an OpenGL layering feature that allows for the projections to be layered and blended (with embedded alphas) directly in Maya's viewport. There's a demo available on the site that is fully-functional (with the exception of watermarks), which should give you an idea of how the tools can help you with a multiple projection workflow. Here's a screen capture that shows the viewport layering in action:

https://vimeo.com/47070439

The projection blending at render time can take advantage of raytracing, through custom Mental Ray or V-Ray shaders.
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