can pfChannels be dynamic?

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Christopher Geyer (cgeyer++at++seas.upenn.edu)
Wed, 5 Mar 1997 23:47:23 -0500 (EST)

For some scene let's say I have a reflective face. I will render this
reflective face by creating a virtual camera that is a mirror of the real
camera, from which I view the scene. The virtual camera will then render
its view from its position only onto the reflective face, the rest of the
display buffer will be masked with a stencil so that I do not write over
it. This is how I will render reflective faces, and I will do it
recursively, similar to ray tracing. I will proceed to render the rest of
the scene, which is now unmasked, once I have traversed the call tree in
the mirrored face.

Assume that this scene is dynamic so that it is possible that the
reflective faces are changing. Now, my question is, would there be too
much overhead rendering each reflective face with a pfChannel? Or is this
exactly what they are meant for? It seems that they are primarily used to
create different viewports which are in there own separate windows in an
interactive environment (e.g. one channel renders an ortho projection
along x, y, and z axes, and another a perspective projection).

Is this clear?

Thanks,
Christopher

----------------------------------------------------------------------------
 Christopher Geyer | CompSci and Math '99 at the University of Pennsylvania
  215-417-3000 | cgeyer++at++seas.upenn.edu | http://www.seas.upenn.edu/~cgeyer/
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