Volume plot, Tuvok: updates for new API.
Second pass integration. This code is a lot simpler, actually works on my Mac, and (most importantly :) can render in parallel. Still a bit of work left. Some minor viewing issues, then 2D transfer functions, and the shaders need some simple updates. Unfortunately there's a lot of shaders to do this for, so we might fix shaders ad hoc until some time is reserved for infrastructure work in Tuvok. git-svn-id: http://visit.ilight.com/svn/visit/trunk/src@8020 18c085ea-50e0-402c-830e-de6fd14e8384
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