[vtkusers] InterpolateScalarsBeforeMapping problem

[Olivier Feys]

Dear all,

I'm using vtk to display Finite Element results on meshes. It is highly 
important that the colors displayed at each pixel correpond to the 
scalar value interpolated at this point.

I can't see any difference when I set InterpolateScalarsBeforeMappingOn 
and SetColorModeToMapScalars. I get the same results when the colors are 
being interpolated.
When a triangle is being displayed, I want that the color at each pixel 
inside the triangle corresponds to the scalar value interpolated. So I 
suppose it would be slower because we must pass through the lookup table 
for each pixel.

Can anybody show me an example where a scalar field is being displayed 
using a vtkUnstructuredGrid and a vtkDataSetMapper ?

Thanks

Olivier