[info-performer] pfEarthSky with asymmetric viewing frustum?

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rick.van.haasen++at++philips.com
Date: 11/10/2004 00:54:20

Hi

i have problems using a pfEarthSky on channels with an asymmetric
perspective viewing frustum:

My application uses 5 channels. These channels are used to compose 1 wide
screen using 5 projectors.
For this setup each channel needs a unique viewing frustum definition (in
order to keep "straight lines straight").
So far so good. However, when i use a pfEarthSky for these channels, only
the "middle"
channel (this is the only one that has a symmetrical viewing frustum)
displays correctly, the other 4 don't,
with areas not being cleared at all, showing accumulated data from
previously drawn frames.
I also see that the "incorrectness" is dependent on the the far clipping
plane distance.

It seems to me that the method used for clearing the background with
earthsky-data doesn't work correcly
if the viewing frustum is "skewed". I looks somehow as if the "screen
filling earthsky-quad" that should be
rendered just in front of the far-clipping plane is not propperly aligned
to the far-clipping plane of the skewed
frustum.

Is there a solution for this problem?

regards,
Rick van Haasen
Philips Research Laboraties
Eindhoven

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