[vtkusers] alpha value in vtk shaders

[Karthik Krishnan]

You can't set an alpha value for the diffuse, ambient or specular color
separately, in VTK. Use the <Member name="Opacity"... > instead.

--
karthik

On Wed, Jul 7, 2010 at 7:28 PM, Adam Bruss <abruss at awrcorp.com> wrote:

>  Hello,
>
>
>
> How would one set an alpha value for “DiffuseColor” in this shader? I tried
> setting number_of_elements to 4 and changing the value to “0.5 1.0 0.0 0.0”
> but it doesn’t work.
>
>
>
> *<?xml version="1.0" encoding="UTF-8"?>*
>
> *<Material name="Twisted">*
>
> *  <Property name="Property1">*
>
> *    <Member name="DiffuseColor" number_of_elements="3" type="Double"
> value="1.0 0.0 0.0" />*
>
> *  </Property>*
>
> * *
>
> *  <Shader scope="Vertex" name="GLSLTwisted" location="Library" *
>
> *    language="GLSL" entry="main">*
>
> *    <ApplicationUniform name="Rate" value="Rate"> </ApplicationUniform>*
>
> *  </Shader>*
>
> *  <!--*
>
> *  <Shader scope="Fragment" name="GLSLTwisted"
> location="c:/temp/GLSLTwistedFrag.glsl" language="GLSL" entry="main">*
>
> *  </Shader>*
>
> *    -->*
>
> *</Material>*
>
>
>
> Thanks,
>
> Adam
>
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