<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Thanx Chris, it was what I thought.<div>It would be interresting if the gemhead turn off when the alpha channel is 0 or not (and why) ?</div><div>++</div><div><br class="webkit-block-placeholder"></div><div>Jack</div><div><br class="webkit-block-placeholder"></div><div><br><div><div>Le 4 avr. 08 à 18:32, chris clepper a écrit :</div><br class="Apple-interchange-newline"><blockquote type="cite">No. In the alpha chain the geometry is still computed only the pixels are not drawn in the back buffer. Also, the gemhead has some overhead for setting up the various states and matrices. 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 <<a href="mailto:jack@rybn.org">jack@rybn.org</a>> 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> _______________________________________________<br> GEM-dev mailing list<br> <a href="mailto:GEM-dev@iem.at">GEM-dev@iem.at</a><br> <a href="http://lists.puredata.info/listinfo/gem-dev" target="_blank">http://lists.puredata.info/listinfo/gem-dev</a><br> </blockquote></div><br></blockquote></div><br></div></body></html>