Hi Matthias,
On Tue, 2004-05-11 at 14:15, Matthias Biedermann wrote:
> Hi folks,
>
>
> I'd like to have some dynamic environment mapping in my application. So
> I'll take the usual way and render the six faces of the cube, grab their
> views into a texture and finally use this as the Cube-EnvMap in my shader.
> As the objects (and thus the "cube-camera") will move around, I thought
> about building a camera decorator that extends the one defined camera to
> look into these six directions in analogy to the StereoCameraDecorator etc.
>
> Is there already such functionality around? And if not, what would be the
> best way to accomplish this, as extending this part of OpenSG seems rather
> involved...maybe some examples or pitfalls.
You can use a standard MatrixCameraDecorator. If you only do 90 degree
rotations that's simple enough. The more interesting part is the six
cube face rendering, that's harder to hide.
> p.s.: Related to this six-face decorator would be a variation to get a
> hemicube rendering. There I thought about taking MatrixCameras instead of
> standard 90-degree perspective ones to limit the frustum of the four
> horizontal cameras to the upper half...something you'd recommend?
If you're comfortable with generating your own matrices go ahead. But in
general a PerspectiveCamera is probably easier to use. And the
MatrixCameraDecorator should help with moving stuff around.
Hope it helps
Dirk
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