To the best of my knowledge there is no built-in GL functionality to do just render any old scene in a spherical projection. Something like an environment map is pre-computed as a bitmap before being textured. You can render into a framebuffer (FBO), which GEM supports, and then apply corrective texturing to geometry. You will need to upload a grid (newWave might work) and then use a vertex shader to apply the deforms to the vertices and texcoords.
<br><br><div><span class="gmail_quote">On 7/25/07, <b class="gmail_sendername">wolfgang schwarzenbrunner</b> <<a href="mailto:schwarz@gen-control.com">schwarz@gen-control.com</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
assuming that maybe no one read that thread as it was sent on weekend :)<br>(or is that question really that "not of interest"?) i send it again and<br>hope for some reaction.... sorry<br><br>as gemwin features things like stereoscopic display alternatives i was
<br>wondering if it might be easy to implement something that distorts the<br>complete gemwin output in a polar coordinate system (for projecting in<br>domes and planetariums).<br><br>it might be not too hard to build something like that using snap2tex a
<br>sphere and some adjustments in the texture coordinates. but somehow i<br>sense a strong smell that openGL might feature such things "directly"<br><br>two examples what i mean by "polar coordinte system" are attached
<br><br>best<br>wolgang<br><br><br>_______________________________________________<br><a href="mailto:PD-list@iem.at">PD-list@iem.at</a> mailing list<br>UNSUBSCRIBE and account-management -> <a href="http://lists.puredata.info/listinfo/pd-list">
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