[vtkusers] vtkLookupTable colours

[Phil Goddard]

I have a question regarding the colours used by vtkLookupTable at the
breakpoints in the table.

Assume I have a vtkLookupTable with the following properties

lut->SetRange(0,3);
lut->SetNumberOfColors(3);

And that the colours generated are 0<red<1<green<2<blue<3

I believe that points with values <= 0 will be red, and that those >=3 will
be blue.
However what are the colours of points with values 1, and those with 2?

i.e. Do the ranges include their lower limit or their upper limit?

Thanks
Phil.