sorry if this seems a really basic question, but i was trying to do this the other day, and it just looked horrid. Everything gets all stretched and nasty :/ any tips or hints on how to do this, and get nice results?
cheers in advance!
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Texturing a sphere. |
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Matte Ixtab
Registered User
Join date: 18 Jan 2005
Posts: 18
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10-26-2005 21:01
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Malachi Petunia
Gentle Miscreant
Join date: 21 Sep 2003
Posts: 3,414
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10-26-2005 21:19
After much experimentation, I have come to the conclusion that it may not be possible to texture spheres totally uniformly. The big problem that I have not been able to find an inverse transformation for (nor have I seen anyone else succeed at) is the "texture pucker" at the pole where all pixels in a row are drawn together at a singular point. Add to that, the changing level of detail (spheres are approximated with polygons, which will turn to hexagons as some distance) and you are lost.
Neither can you lay an orange peel on a flat surface nor comb a hairy basketball completely flat. Were I a better mathematician, I might be able to show why. You can get the less polar sections of a sphere textured "properly" using the polar transformations available in photoshop (and PSP, I think). _____________________
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Matte Ixtab
Registered User
Join date: 18 Jan 2005
Posts: 18
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10-26-2005 22:29
that is what i feared... cheers for letting me know though, will have to play about in Photoshop and just try to employ some clever tricks!
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Namssor Daguerre
Imitates life
Join date: 18 Feb 2004
Posts: 1,423
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10-27-2005 06:10
This post has more information on this sort of thing, and it's only a few scrolls away!
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Cocoanut Koala
Coco's Cottages
Join date: 7 Feb 2005
Posts: 7,903
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10-27-2005 09:53
After much experimentation, I have come to the conclusion that it may not be possible to texture spheres totally uniformly. The big problem that I have not been able to find an inverse transformation for (nor have I seen anyone else succeed at) is the "texture pucker" at the pole where all pixels in a row are drawn together at a singular point. Add to that, the changing level of detail (spheres are approximated with polygons, which will turn to hexagons as some distance) and you are lost. Neither can you lay an orange peel on a flat surface nor comb a hairy basketball completely flat. Were I a better mathematician, I might be able to show why. You can get the less polar sections of a sphere textured "properly" using the polar transformations available in photoshop (and PSP, I think). A hairy basketball?  I've never seen one of those! But still, seems like you could come it completely flat. All hairs going out from the point at the top, that part is easy. Then when you get to the bottom, they can still be combed flat, assuming they can all intersect, so that you can come them through the other hairs coming from the other sides, and still make them go down flat. um . . . I need a life. coco P.S. But then, that would be just like a pattern with only vertical stripes. Those stripes would come together at the top and bottom of the sphere. The problem comes up more when you have a plaid, or some multi-directional pattern. And I agree, like the orange, I just don't see any way these patterns could do anything ELSE but what they do on the sphere. _____________________
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Matte Ixtab
Registered User
Join date: 18 Jan 2005
Posts: 18
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10-27-2005 10:42
This post has more information on this sort of thing, and it's only a few scrolls away! haha, aye, it wasn't when i asked this question though, someone musta bumped it up  |