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Ken Martin authored
Point association picking was not implemented this patch adds that in. Also cell picking did not work when the input contained quads or higher vertex count polygons. To address these issues the picking process needs to give the mapper an opporunity to map the index from the frame buffer back into a point id or cell id. Added amvirtual method in prop to do that and an implementation in OpenGLActor and OpenGLPolyDataMapper to properly map gl_PrimativeId in the correct point or cell id. Point picking was not tested in VTK so I added a test for that as well. Change-Id: If276e80ab3966646dd9f6f95fbc7734c006f000c
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