You can&#39;t set an alpha value for the diffuse, ambient or specular color separately, in VTK. Use the &lt;Member name=&quot;Opacity&quot;... &gt; instead.<br><br>--<br>karthik<br><br><div class="gmail_quote">On Wed, Jul 7, 2010 at 7:28 PM, Adam Bruss <span dir="ltr">&lt;<a href="mailto:abruss@awrcorp.com">abruss@awrcorp.com</a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">








<div link="blue" vlink="purple" lang="EN-US">

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<p class="MsoNormal">Hello,</p>

<p class="MsoNormal"> </p>

<p class="MsoNormal">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.</p>

<p class="MsoNormal"> </p>

<p class="MsoNormal"><b>&lt;?xml version=&quot;1.0&quot;
encoding=&quot;UTF-8&quot;?&gt;</b></p>

<p class="MsoNormal"><b>&lt;Material name=&quot;Twisted&quot;&gt;</b></p>

<p class="MsoNormal"><b>  &lt;Property name=&quot;Property1&quot;&gt;</b></p>

<p class="MsoNormal"><b>    <u><span style="color: rgb(192, 0, 0);">&lt;Member
name=&quot;DiffuseColor&quot; number_of_elements=&quot;3&quot;
type=&quot;Double&quot; value=&quot;1.0 0.0 0.0&quot; /&gt;</span></u></b></p>

<p class="MsoNormal"><b>  &lt;/Property&gt;</b></p>

<p class="MsoNormal"><b> </b></p>

<p class="MsoNormal"><b>  &lt;Shader scope=&quot;Vertex&quot;
name=&quot;GLSLTwisted&quot; location=&quot;Library&quot; </b></p>

<p class="MsoNormal"><b>    language=&quot;GLSL&quot; entry=&quot;main&quot;&gt;</b></p>

<p class="MsoNormal"><b>    &lt;ApplicationUniform name=&quot;Rate&quot;
value=&quot;Rate&quot;&gt; &lt;/ApplicationUniform&gt;</b></p>

<p class="MsoNormal"><b>  &lt;/Shader&gt;</b></p>

<p class="MsoNormal"><b>  &lt;!--</b></p>

<p class="MsoNormal"><b>  &lt;Shader scope=&quot;Fragment&quot;
name=&quot;GLSLTwisted&quot; location=&quot;c:/temp/GLSLTwistedFrag.glsl&quot;
language=&quot;GLSL&quot; entry=&quot;main&quot;&gt;</b></p>

<p class="MsoNormal"><b>  &lt;/Shader&gt;</b></p>

<p class="MsoNormal"><b>    --&gt;</b></p>

<p class="MsoNormal"><b>&lt;/Material&gt;</b></p>

<p class="MsoNormal"> </p>

<p class="MsoNormal">Thanks,</p>

<p class="MsoNormal">Adam</p>

</div>

</div>


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