Hi Enrico,
On Wed, 2005-04-27 at 14:16 +0200, Enrico Borrione wrote:
> hi dirk, hi all osg users,
> after a prolonged absence, here i am again.
> I am considering the idea of adding to my app the
> support for dome projection. In few words,
> i'd like to have 2 or more projectors shooting on
> some curved mirrors, and then displayng the whole
> scene on a dome screen.
> In order to achieve this objective, the first step
> is to have a sphere-distorted viewport of the scene.
> After a bit of googling around, it seems that the only
> way to do a distorted projection of the screen is
> rendering to a texture and then distort it in some
> way.
> Does OpenSG allows to render to a target and then
> post process it (realtime)?
> Any hint on the subject?
We're doing similar things for color correction and for a little bit of
distortion correction in the Cave in Darmstadt, so yes, it's definitely
possible.
The most general way is to add a Viewport with a TextureGrabBackground
that just grabs whatever is on screen into a Texture and then uses that
texture with a distortion geometry.
Source/WindowSystem/GLUT/testWindowGLUTTGB.cpp is an example for that.
The real trick is creating the distortion geometry. Getting that to work
and correctly line up is not simple...
HIH
Dirk
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