IsoSurfaces for Gridded3DSet

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I am attempting visualization of a 3D curvilinear data set with a
Gridded3DSet.  I am aware that the default DataRederers only do volume
rendering for Linear3DSets, but I was wondering if it is possible to
visualize iso-surfaces of the Gridded3DSet directly.  I tried
rgbIsoMap = new ScalarMap( rgbVal,  Display.IsoContour );
contWid = new ContourWidget(rgbIsoMap);

as according to the tutorial. It doesn't mention if this methodology is only
applicable to Linear3DSets, but I am assuming that it is since I haven't had
any success with it.  I am looking for a way around resampling to a
Linear3DSet.  Any help would be greatly appreciated.


On a related note, are there any custom DataRenderers available for direct
volume rendering of Gridded3DSets?





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