[vtkusers] vtkColorTransferFunction question

[vlibertiaux]

Hello everyone,

I use a colortransferfunction to be able to set an "out of color bar value"
for an exclusion value.

My exclusion value is -1 and my actual values range from 0 to 0.5.

I build the colortransferfunction like this:

		color->AddRGBPoint(-1, 0.5,0.5,0.5,1,1);
		color->AddRGBPoint(smin,0,0,1);
		color->AddRGBPoint( (smax+smin)/2,0,1,0);
		color->AddRGBPoint(smax,1,0,0);

so that I have gray values from -1 to smin and my actual colorbar from smin
to smax.

The problem is that this color bar is linear, so I have a large gray portion
on my scalarbar.  

What can I do to have a non linear scalar bar, i.e. make the -1, smin part
shorter than the smin, smax part on the bar ?

Thank you very much for your answers !

Best regards,

V.

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