Day and night in Gusev crater not correct in Celestia

General discussion about Celestia that doesn't fit into other forums.
Topic author
Jordi

Day and night in Gusev crater not correct in Celestia

Post #1by Jordi » 05.01.2004, 02:37

Why???? When in reality is day in Mars, in Celestia is night.

Topic author
Jordi

Problem corrected

Post #2by Jordi » 05.01.2004, 02:49

I'm sorry...

ElPelado
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Post #3by ElPelado » 05.01.2004, 12:58

Maybe your tetxture is not well aligned...
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selden
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Post #4by selden » 05.01.2004, 14:16

To clarify what ElPelado said:

Celestia requires that all maps have 0 degrees of longitude in the center, with 180 degrees of longitude at the edges. Many maps of Mars have 0 degrees of longitude at the left and right edges, with 180 degrees of longitude in the center, including maps on Fridger's "Texture Foundry".

Using a map with 0 at the edge would cause the symptoms you describe.

I'll add this to the "Preliminary User's FAQ"
Selden

Jugalator

Post #5by Jugalator » 08.01.2004, 08:54

I was just going to post about this. :) Since it's quite important in some cases, I wonder what the options are? Any ways to fix these textures? Or are their other high res textures than those on his site? It's the only ones I've found for Celestia, but I admit I'm a bit new. :)

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selden
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Post #6by selden » 08.01.2004, 12:25

Jugulator,

Surface textures are just pictures.

The fix is to use your favorite paint program to cut the map in half and exchange the halves. This changes what was the center into an edge.

A free DDS Photoshop plugin is available from Nvidia for imorting and exporting DDS textures, if that's necessary.

Precise control of where the cut happens is available if you use a NetPBM or ImageMagick picture manipulation program.
Selden


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