[vtkusers] Colour mapping based on coordinate index

[Dominik Szczerba]

I would create an integer scalar field with the k coordinate from your
application.
--DS

Stefan Riha wrote:
> Hi!
> 
> How can I get the mapper not to colour based on scalar values, but
> based on the k index of the point the scalar is defined on? How can I
> do this efficiently? (Instead of defining a lookuptable that maps
> every scalar to a colour)
> 
> I have a Structured Points set with dimensions (100, 100, 40) and a
> scalar on every point. The scalar will be used to do  WarpScalar for
> every i-j hyperplane taking k as constant. So I will have 40 surfaces
> that can be parametrized with i,j.
> The Problem is that I want to colour the 40 surfaces in 40 different
> colours and I don't want to do this by hand.
> 
> 
> I can extract the i,j planes with ImageDataGeometryFilter, create
> different mappers and actors and give them different colours. That's
> too much work.
> 
> I can extract the i,j planes with ImageDataGeometryFilter and then use
> AppendPolyData, but how do I tell the mapper to NOT colour based on
> scalar values, but based on the k index of the point the scalar is
> defined on.
> 
> Thanks, stefan
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