Re: earth sky drawing

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Paul Levy (plevy++at++tabor.mitre.org)
Tue, 9 Aug 94 8:43:31 EDT

Another technique for drawing the sky is to use one polygon with
an alpha cloud texture on it. The polygon is located directly
above the eyepoint, sloping slightly towards the horizon, and
extending to the far clipping plane. To add a bit of realism,
when the eyepoint moves forward, we scroll the cloud texture
backwards and move the polygon with the eyepoint. It looks as
though you are flying through scattered clouds. Since you can see
through the clouds to the EarthSky, changing the earthsky colors
and adding lightpoints for stars can result in a very realistic
looking sky at any time of the day.

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        Paul Levy   -   The MITRE Corporation   -   McLean, Virginia
                             703-883-7421	
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