Re: pfEarthSky with off-axis viewing frustra

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Gan Wang (rock.csd.sgi.com!sgi.com!uunet.uu.net!ds9!cavalier!gan)
Fri, 11 Apr 1997 11:06:57 -0700

On Apr 9, 1:14pm, Christopher R Volpe wrote:
> Subject: pfEarthSky with off-axis viewing frustra
> The man page for pfEarthSky says it doesn't work with off-axis viewing
> frusta, but that is what I need. Can someone tell me what the nature of
> the problem is and if there is a workaround?
>

PfEarthSky only works with "Z-up" coordinates. So you have make sure that your
rendering coordinates have Z-up. If you scene graph is built in a non-Z-up
coordinate system, you have to take care of the coordinate transformation
(rotation and maybe translation if the two origin do not coincide) from your
coordinates to the rendering coordinates. This can be done by adding a DCS on
the top of your scene graph. Hope this help.

Cheers,
Gan

> thanks,
> Chris
> --
>
> Chris Volpe Phone: (518) 387-7766
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>-- End of excerpt from Christopher R Volpe

-- 


Gan Wang


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