No.&nbsp; In the alpha chain the geometry is still computed only the pixels are not drawn in the back buffer.&nbsp; Also, the gemhead has some overhead for setting up the various states and matrices.&nbsp; Turning off the gemhead bypasses everything in the chain.<br>
<br><div class="gmail_quote">On Fri, Apr 4, 2008 at 11:20 AM, Jack &lt;<a href="mailto:jack@rybn.org">jack@rybn.org</a>&gt; wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Is it the same when the alpha canal of a [colorRGB] is 0 than when<br>
[gemhead] has received the message 0 :<br>
<br>
[gemhead]<br>
|<br>
[alpha]<br>
|<br>
[colorRGB 1 1 1 0]<br>
|<br>
[square]<br>
<br>
<br>
is it the same for the ressources take from the CPU/GPU than :<br>
<br>
<br>
[loadbang]<br>
|<br>
|0(<br>
|<br>
[gemhead]<br>
|<br>
[square]<br>
<br>
(The both methods erase the square).<br>
<br>
Thanx.<br>
++<br>
<br>
Jack<br>
<br>
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</blockquote></div><br>