[vtkusers] Color maps

[Ula Popov]

Hi all,

I have a couple of questions about color maps.
I have a scalar date that's range is [0..1265]
My code looks like this:

            vtkLookupTable *lut = vtkLookupTable::New();
            lut->SetNumberOfColors(256);
            lut->SetHueRange(0.0,1.0);
            lut->Build();

            vtkDataSetMapper *mapper = vtkDataSetMapper::New();
            mapper->SetInputConnection(T2_reader->GetOutputPort());
            mapper->SetLookupTable(lut);
            mapper->SetScalarRange(0.0, 1265.0);

I have 2 problems:
- 70% of the picture is red. How can I "shift" the color map? What should I
do to see 70% white?
- How can I change the opacity? If I want [0..300] be 0.3 opaque and
[301..1265] 0.8 opaque?


Thank you,
Uliana
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