Cloud layer disrupted at high rotation rates.

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alan_federman
Posts: 60
Joined: 10.01.2003
With us: 21 years 10 months
Location: Silicon Valley

Cloud layer disrupted at high rotation rates.

Post #1by alan_federman » 20.03.2003, 01:19

If you speed up time on the earth to a ridiculous rate > 10^7 so the year goes to 20,000 ad or so, the could layer becomes disrupted and makes the earth look like a gas giant. THis happened with the DDS earth in both versions 1.25 and 1.30.. really cool effect. DOn't ask me why any one would won't to speed up time to 10^7 above normal - maybe the wanted to see if the sun becomes a red giant?
Alan Federman

chris
Site Admin
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Joined: 28.01.2002
With us: 22 years 9 months
Location: Seattle, Washington, USA

Post #2by chris » 20.03.2003, 01:25

I think I have some idea what might be happening . . . A texture transform is used to rotate the clouds. Far in the future, the transform uses a very large translation for the texture, causing a loss of floating point precision when the graphics hardware does texture coordinate interpolation . . . It should be easy to fix; I'll just clamp the translation to [0, 1] before sending it off to the hardware.

--Chris


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