cloud and bumpmap data

[billybob884]

i've noticed that there are cloud textures for venus, saturn, and jupiter, but nothing in the solarsys.ssc document, what should be entered. i've also noticed that the bumpmap for mimas doesn't line up with the texture. oh, and by the way, does anyone know where i can get a higher res uranus texture?

[selden]

Mike,

When adding clouds, it's probably easiest to make an entry in solarsys.ssc that's similar to what is used for the Earth's clouds. For a detailed description of the declarations to use, see the description of the SSC file format by Thomas Guilpain at http://members.fortunecity.com/guilpain/index_uk.htm

If you haven't already, you might consider getting Grant Hutchison's updated texture maps and solarsys.ssc. Among other things, his Zip file includes updated Venus surface and cloud maps. See http://www.lns.cornell.edu/~seb/celestia/hutchison/index.html#1

Celestia's distribution kit for v1.2.5 only includes a shaded picture as a surface texture for Mimas, which is projected onto a sphere. It does not include a 3D model for the moon or even a bumpmap. Apparently you're using someone's add-on. You'll have to specify whose and where you got it before it can be repaired.

Bear in mind that Uranus is extremely cold, so its clouds don't have much visual structure. The visually entertaining pictures are all false-color. The only surface (cloud) map I've found is the 1K map by James Hastings-Trew at http://gw.marketingden.com/planets/uranus.html

[billybob884]

when i was talking about uranus, i was talking about the surface texture, but nevermind i found one, and as for the mimas bumpmap, i fixed it. thanks for the cloud info! all i need now is saturn and jupiter.

[selden]

Mike,

Uranus has no visible surface. There are only clouds. All the way down
The surface texture map for Uranus is a picture of its clouds.
Where did you find a better one?

[jim]

Hi Mike

A good startpoint is 'Selden's List of Resources for Celestia'.

Try this huge map list for your search:
http://www.johnstonsarchive.net/spacear ... lmaps.html

The best jupiter map i found here:
http://www.mmedia.is/~bjj/data/jupiter/index.html

But i have now three different jupiter maps (the red spot is different placed). I'm not sure which of them is propper.

Bye Jens

[billybob884]

it is onhte last site in your first post, it was better resolution for me, probably not for you since you had the site

[granthutchison]

But i have now three different jupiter maps (the red spot is different placed). I'm not sure which of them is propper.

Jens, they're probably all "proper" - there's no standard position for the Great Red Spot in Jupiter maps, since it drifts in longitude relative to the standard prime meridian (which is based on the rotation of Jupiter's magnetic field).
If you want the Great Red Spot to appear in the correct position, you just need to calculate a RotationOffset for whichever map you're using.
The formula (using the present longitude of the GRS) is:

RotationOffset = -21 + (1 - 2*GRSPixelOffset/MapPixelWidth)*180

where GRSPixelOffset is the distance in pixels between the left edge of your map and the centre of the Great Red Spot, and MapPixelWidth is the width of your map in pixels.
(And remember to use a RotationPeriod of 9.927953, which is the rotation period of the Great Red Spot.)

Grant

[jim]

Thank you grant

I notice you made allready a post about this topic. Sorry i forgot this. Now my RotationOffset is -42,3. I'm not sure but i think i use fridgers jupiter map.

Bye Jens