This is a follow-on to https://www.google-melange.com/gci/task/view/google/gci2014/6109916221669376

Verify and validate that UV mapping is implemented correctly and/or reasonably well enough. You'll do this by demonstrating that UV mapping is working (by texture mapping or checker shader or a variety of other ways), rendering an image.

Submit an image that demonstrates UV mapping is working along with a patch file of any changes to the source code that were necessary.

• http://brlcad.org/w/images/9/9a/Principles_of_Effective_Modeling.pdf <-- has examples of how to do mapping

• src/librt/primitives/extrude/*
• src/librt/primitives/sketch/*