[PD] wishlist gemwin

chris clepper cgclepper at gmail.com
Wed Jul 25 16:32:00 CEST 2007

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.

On 7/25/07, wolfgang schwarzenbrunner <schwarz at gen-control.com> wrote:
> assuming that maybe no one read that thread as it was sent on weekend :)
> (or is that question really that "not of interest"?) i send it again and
> hope for some reaction.... sorry
> as gemwin features things like stereoscopic display alternatives i was
> wondering if it might be easy to implement something that distorts the
> complete gemwin output in a polar coordinate system (for projecting in
> domes and planetariums).
> it might be not too hard to build something like that using snap2tex a
> sphere and some adjustments in the texture coordinates. but somehow i
> sense a strong smell that openGL might feature such things "directly"
> two examples what i mean by "polar coordinte system" are attached
> best
> wolgang
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