[PD] render into rectangle

[IOhannes m zmoelnig]

IOhannes m zmoelnig wrote:
> you could do it in double-buffered mode as well if you make sure that 
> the rectangle to texture on is just before everything else (and you 
> would probably want a 2nd rectangle that guarantees that the edges 
> beyond your texture-geo are still black.
> render order is important.

just for illustration.
when the surface does not bend in the z-dimension, you will get less 
problems with the original scene getting through

mfg.asd.r
IOhannes
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