I extended the multi resolution data selection support to work in 3d.
This is still a work in progress but it is in a useable state. The way things are currently working is that the reader gets an axis aligned bounding box for the view frustum. I will see how this works and if it isn't good enough I may change it to pass the view frustum volume and the equations of the 6 planes that define the view frustum. I will also soon check in an enhanced MRTest database reader that also provides 3d data. git-svn-id: http://visit.ilight.com/svn/visit/trunk/src@22559 18c085ea-50e0-402c-830e-de6fd14e8384
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