UVDan opened this issue on May 31, 2005 ยท 23 posts
UVDan posted Tue, 31 May 2005 at 9:31 PM Forum Moderator
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UVDan posted Tue, 31 May 2005 at 9:33 PM Forum Moderator
Attached Link: Better Poser Planets with UV Mapper Pro
Here is a moon created with a sphere from UV Mapper Pro. A tut is available in the UV Mapper forum. After following the tut please come back here to finish up the Poser portion of the tut.Free men do not ask permission to bear
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UVDan posted Tue, 31 May 2005 at 9:35 PM Forum Moderator
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UVDan posted Tue, 31 May 2005 at 9:37 PM Forum Moderator
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UVDan posted Tue, 31 May 2005 at 9:38 PM Forum Moderator
I have to say that this is for Pro Pack and Poser 4. I have not tried it in Poser 5 or 6.
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xantor posted Tue, 31 May 2005 at 9:54 PM
Thank you.
fls13 posted Tue, 31 May 2005 at 10:10 PM
Don't forget, astronomy fans, that Earth is thicker pole to pole than at the equator and Saturn is the opposite. :O)
stahlratte posted Tue, 31 May 2005 at 11:19 PM
Great tutorial, UVDan !
Many thanks. :-)
stahlratte
UVDan posted Wed, 01 June 2005 at 12:01 AM Forum Moderator
xantor, fls13, and stahlratte.
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kuroyume0161 posted Wed, 01 June 2005 at 12:59 AM
Except for the gas giants, for all intensive purposes, the planets are spherical - unless you are doing animations for NASA or something. Oblateness in most cases is negligible. But I would make Phobos and Deimos with extra special care. :)
C makes it easy to shoot yourself in the
foot. C++ makes it harder, but when you do, you blow your whole leg
off.
-- Bjarne
Stroustrup
Contact Me | Kuroyume's DevelopmentZone
fls13 posted Wed, 01 June 2005 at 2:00 AM
Oblate! That's the word for Saturn, and oblate it is! Obvious even from photos.
spinner posted Sat, 04 June 2005 at 3:50 AM
So how would you get rid of the polar pinching at the ah.. poles ? ~S
Message edited on: 06/04/2005 03:54
spinner posted Sat, 04 June 2005 at 4:01 AM
Nevermind - figured it -my bad :-) ~S
UVDan posted Sat, 04 June 2005 at 9:18 AM Forum Moderator
It has already been stretched at the poles to take care of it.(just in case anyone else is wondering)
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spinner posted Sat, 04 June 2005 at 10:00 AM
Edit - double post w/o urls. I'm sorry, but I don't delete posts. S
Message edited on: 06/04/2005 10:05
spinner posted Sat, 04 June 2005 at 10:03 AM
Stretching the map at the poles won't do anything to fix it - the texture needs to be flat, max one or two shades, otherwise you get polar pinching. I'll show you :
(Sorry 'bout linking, tried keeping thread load size down :-))
http://spinner.northern-studios.com/imgs/mesh1.jpg - generic UVM sphere
http://spinner.northern-studios.com/imgs/mesh2.jpg - generic sphere stretch test(img, not native UVM)
http://spinner.northern-studios.com/imgs/mesh3.jpg - Texture from front
http://spinner.northern-studios.com/imgs/mesh4.jpg - Texture on top with polar pinching.
So the workaround I figured was to just use a bump-map for terrain variety and then put a one-coloured texture over it - like an icecap.
If the texture is flat-shaded on top you won't get this.
~S
UVDan posted Sat, 04 June 2005 at 12:33 PM Forum Moderator
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UVDan posted Sat, 04 June 2005 at 12:44 PM Forum Moderator
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spinner posted Sat, 04 June 2005 at 1:06 PM
First of all - dont scream. Second - I assumed it also applied to textures you didn't download from a website somewhere - there is a discrepancy at the top of the moon, if you look closely - the texture gets narrower. The ice on Greenland is somewhat pinched (not squashed, pinched)- the isce on the southern tip doesnt look like that, if you compared it w. a map (And since I work with 3D military mapping applications, I know how Greenland looks with ice) Since we're not seeing eye to eye here, I'll leave you to it, and not ask any furher questions which may be difficult to answer. ~S
UVDan posted Sat, 04 June 2005 at 2:58 PM Forum Moderator
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spinner posted Sat, 04 June 2005 at 3:08 PM
Fair enough - All caps means to shout in web/netspeak and I thought you were shouting at me. As for HTML - you may want to check this site out: http://www.davesite.com/webstation/html/chap03.shtml Actually - taking a peek at the moon map helped - I moseyed over to some of the NASA archives. They're squashing, whilst a lot of us others are actually stretching or reducing colour/density in that area. So I'll actually see what happens if I blow a texture up around the poles instead of making it as noisefree as possible ~S
kuroyume0161 posted Sat, 04 June 2005 at 3:54 PM
I think a good place to start is a link like this: Map Definitions And move on to this link: Map Projections There is no mapping of a sphere to a plane that will ever be without distortions of one type or another. The hardest part here, I guess, is getting a planar map projection that matches the UV layout of the sphere. The one pictured above for the Moon appears to be a Miller Cylindrical projection (as compared to a Mercator where the poles are stretched vertically).
C makes it easy to shoot yourself in the
foot. C++ makes it harder, but when you do, you blow your whole leg
off.
-- Bjarne
Stroustrup
Contact Me | Kuroyume's DevelopmentZone
UVDan posted Sat, 04 June 2005 at 7:43 PM Forum Moderator
That will help.
Free men do not ask permission to bear
arms!!