From: Marc Mendez (mmendez++at++silicon-worlds.fr)
Date: 09/11/2002 03:00:58
Hi Performers,
I m sorry about my previous question about the culling and drawing, I
doesn t
appear to have been clear... holidays haven t been enough.
What I m trying to do is Augmented Reality:
- I ve got a video in the scene background,
- I d like to display on top of it some synthetic objects positionned at
the
right place in the "real" scene.
The simplest problem I m facing is:
- imagine a movie where you can see a room with a table,
- I d like to display a chair behind the table.
I ve got the video camera position driving the Performer synthetic scene
camera.
If I simply display the chair with Performer, it will always be seen in
front of
the table (no culling because no Z-information in the video).
So I m thinking about using a synthetic scene of the real scene with:
- the real objects (for culling),
- the augmenting objects (for the display).
How, with Performer, can I cull efficiently the augmenting objects to
only draw
the seen part of the chair that is not behind the table ?
What is the way to do it with Performer ? Can I just disable a draw flag
for the
real objects ? Or should I first "manually" cull the synthetic objects
and then,
retrieving the remaining parts of the synthetic objects, draw it ???
Thank you again,
pfRegards,
Marc.
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