[vtkusers] Colour map complex scalars

[John Platt]

Hi,

I would like to colour map complex scalars. This could be the magnitude or the real part after multiplying the scalars by exp(i theta) for a specified angle theta. 

I have written a class vtkLookupTableComplex derived from vtkLookupTable. MapScalarsThroughTable2() does the conversion of the real and imaginary components to a single value which is then mapped through the table.

This appears to work except when InterpolateScalarsBeforeMapping is set on the mapper. In this case, the scalars are mapped by vtkScalarsToColorsPainter::MapScalarsToTexture().

I am beginning to think a vtkDataSetAlgorithm based solution would be easier but I need the performance for animating the scalars by varying the angle theta from 0 - 360.

Should I give up or is there another approach?

Thanks for your time.

John.
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