[vtkusers] Mappers and vtkLookupTable

[David Gobbi]

Hi Allen,

You are correct, vtkLookupTable does not provide a way of doing this.

I'm not sure what work-arounds there are for geometry, but for images
you can map the RGB and A separately, and then combine them into
RGBA with vtkImageAppendComponents.

 - David


On Tue, Feb 16, 2016 at 11:48 AM, Allen Sanderson <allen at sci.utah.edu>
wrote:

> Hello,
>
> We are trying to render geometry using a lookup table for the RGB value
> using one scalar variable, but we want to use a secondary scalar variable
> for determining the opacity.  Something like the following:
>
> RGB -> variable one
> A -> variable two
>
> In looking through the VTK 6 documentation on mappers we have not found
> anything that leads us to believe this functionality is possible. But we
> have done an exhaustive search.
>
> If it is possible we would greatly appreciate pointers. Thanks.
>
>
>
> Cheers,
>
>
> Allen
>
>
>
> Allen Sanderson
>
> SCI Institute
>
> University of Utah
>
> www.sci.utah.edu
>
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