[vtkusers] vtkColorTransferFunction and opacity

[Steve Joyce]

Hi,

Setting the opacity of actors does not work when using a
vtkColorTransferFunction as the colour lookup table. This is because the
alpha value for a colour is always returned as 255 by
vtkColorTransferFunction.

As a fix for this I replaced the places where this occurred in
vtkColorTransferFunction  with
(unsigned char)(this->GetAlpha() * 255.0)
or
(unsigned char)(self->GetAlpha() * 255.0) 
as appropriate.

This seemed to work for me, so I was wondering why it was fixed at 255
in the first place. Am I doing the wrong thing?

Thanks,
Steve





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