Offset of cloud VT

[ElChristou]

Folks, I just build 32k cloud VT, I change the cloud speed to 0 but within Celestia I have a really big offset (~60 to 90°) vis-?-vis the color map. Any idea what's going on?

[ElChristou]

(BTW, the reference files of the cloud map and color map match perfectly of course...)

[chris]

Folks, I just build 32k cloud VT, I change the cloud speed to 0 but within Celestia I have a really big offset (~60 to 90°) vis-?-vis the color map. Any idea what's going on?

No idea. Does it work correctly when you use a smaller (say 2k) cloud texture that's not a VT?

--Chris

[Don. Edwards]

Ok this is probably going to sound dumb, but.
It sounds like several rows of tiles somehow got miss labeled. Not enough to throw the whole VT out of whack, but just enough to shift everything over your 60 to 90 degrees.
The only way I can think to test this is to restitch the VT as it stands back into a single 32k texture, resize it and then place it over another texture of the Earth and see if in fact things have gotten shifted. If not than Celestia must be doing it. If that's the case, its back to Chris.

Working with 32k is a whole new ball game. I though it was tough enough to make 16k VT clouds.

Don. Edwards

[ElChristou]

Folks, I just build 32k cloud VT, I change the cloud speed to 0 but within Celestia I have a really big offset (~60 to 90°) vis-?-vis the color map. Any idea what's going on?

No idea. Does it work correctly when you use a smaller (say 2k) cloud texture that's not a VT?

--Chris

Nope, same thing. Seems at zero speed the cloud map is miss-aligned... This is a bit annoying because the 32k map (done with the old ~42k map from BMOG (old generation ) have zones upon lands that are clearly visible (Yucatan for example) or clouds blocked by mountains in the Andes that are pretty cool...
Should this be considered as a bug?

[ElChristou]

Ok this is probably going to sound dumb, but.
It sounds like several rows of tiles somehow got miss labeled. Not enough to throw the whole VT out of whack, but just enough to shift everything over your 60 to 90 degrees.
The only way I can think to test this is to restitch the VT as it stands back into a single 32k texture, resize it and then place it over another texture of the Earth and see if in fact things have gotten shifted. If not than Celestia must be doing it. If that's the case, its back to Chris.

Nope, the VT is perfect, I done a test with a 2k reconstituted png and get the same...

Working with 32k is a whole new ball game. I though it was tough enough to make 16k VT clouds.

Indeed if one want it really well done, those maps from BMOG are really bad, lot of stuff have been duplicated, several res have been mixed some part have lost their "density" etc...
I tried this 32k to see the result upon my fresh 64k, the result is indeed quite interesting, but the overall quality (despite removing almost all artifacts) is not enough constant...

[bh]

No idea... would like to see a screenie.

[cartrite]

The outline of the west coast of South America is clearly visible in that cloud map. Where is this lining up?
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[ElChristou]

Here (the marker):

Image 2.jpg

[cartrite]

The only thing that comes to mind is that you may have a setting in your solarsys.ssc file that shifts the earths rotation east by about 60 to 90 degrees. Try modifying an original solarsys.ssc file to include your new cloudmap.
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[ElChristou]

The only thing that comes to mind is that you may have a setting in your solarsys.ssc file that shifts the earths rotation east by about 60 to 90 degrees. Try modifying an original solarsys.ssc file to include your new cloudmap.
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I tried that, now way... The odd part is that I begun by a test with half texture (only west, east transparent) and it was OK...

[Don. Edwards]

Well maybe your 32K VT has reached an unknown memory ceiling in Celestia. Or that using such a large VT as a cloudmap throws off Celestia's positional calculations a bit. Can't think of any other reason that could be causing it.

Have you tried not to implement the clouds on Earth but a transparent shell model as a cloud layer on that to see if by chance it lines up right. At least with the other model you could fine tune the texture to line up were you want it to. But its going to take some work. Just an idea though.

Don. Edwards

[cartrite]

Here is something you can try so you can rule out any offset that was caused by stitching the east and west files together. In my level5 folder, here is tx_46_20. Does it look the same as your 46_20. My tiles are 512x512 and I used the same data files you did.

tx_46_20.jpg

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[ElChristou]

Here is something you can try so you can rule out any offset that was caused by stitching the east and west files together. In my level5 folder, here is tx_46_20. Does it look the same as your 46_20. My tiles are 512x512 and I used the same data files you did.

Stephen, how can you have a level5 with a 32k? Do you begin with 1k at level0?
Perso I do begin with 1k at level 0 so yes I do have a level 5 (and a level6 for the 64k color) and it's the tx_36_20 that correspond almost to your tile. I say almost because it's not exactly the same offset...

[cartrite]

Sorry, I did my clouds long ago and they were 512x512. I thought you did them at 512x512. If you did your VT at that size, you would have had the same tiles I had unless something went wrong when you were making them.
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[ElChristou]

It' s a 512x512 set... I wonder if something could go wrong with the PS raw export... I will have to redo all the process again I fear...

[cartrite]

The clouds can be any size. I did mine at 512x512 long ago when I had an older computer. I also used Fridger's old virtualtex script. That old Blue Marble cloud data had some problems with seams between the east and west. The best way of dealing with these seams is to offset the image and blend them. I thought that maybe you had offset the image while working on it and didn't change it back which would account for your problem.

Also, after you put the images together and add in the transparency with your image editor, save it as png. Then you can use png2bin.
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[ElChristou]

Nope , I revert back the offset after editing the seam... I'll test saving png and using png2bin...

[cartrite]

Alright, just did a cloudmap with 1k tiles. Here is tx_15_4 from level4. Does this look the same as yours.

tx_15_4.jpg

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