I have done a little work on gemframebuffer recently.  I added a message for changing the background color and also uncommented some of the glMatrix() code.  It is close to rendering properly but has the following problems:
<br><br>- OSX only works with exact powers of two for size<br>- separator doesn't work in chains following gemframebuffer<br>- all geos are textured with the contents of gemframebuffer<br><br>I'm kind of slow when it comes to correctly setting and unsetting the glMatrix calls, so that is probably where the problem lies.&nbsp;&nbsp; It seems trickier with basically having a completely different rendering target inside of another one too.
<br><br>Testing patch attached.<br>