Tania Hutchinson
Registered User
Join date: 27 Jun 2008
Posts: 96
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06-13-2009 08:39
I am building a bath in my holodeck but ran into a problem with how the textures look depending on the camera angles. It is as if the texture disappears. How it should look. From a different angle. What causes this, and is there anything I can do to lessen the effect? Thank you.
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Chosen Few
Alpha Channel Slave
Join date: 16 Jan 2004
Posts: 7,496
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06-13-2009 09:24
It's called the alpha sorting glitch. When two 32-bit textures overlap in close proximity, the renderer has trouble determining the proper draw order. The one that is physically closest to the camera, or in some cases, the one that is most perpendicular to the camera, ends up "in front", regardless of what would be optically correct in the real world. Computers don't determine "in front" and "in back" the same way humans do. The solution is never to use 32-bit textures unless absolutely necessary. Replace that floor texture with a 24-bit one, and the problem will stop. For more on this subject, read the transparency guide at the top of the texturing forum. By the way, just so you know, this is not an SL problem. It's a general 3D graphics problem. It happens in everything from video games to professional 3D modeling suites that cost thousands of dollars. The reason you don't see it in games is because professional 3D artists are aware of it, and make a point of avoiding it. The reason you see it all over SL is because the content is user created, and most users don't know anything about it, until they learn the hard way, just as you now have. 
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Tania Hutchinson
Registered User
Join date: 27 Jun 2008
Posts: 96
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06-13-2009 09:30
How do I know whether a texture is 32 bit or 24 bit?
ETA: nvm I read the info in the texturing forum. Thank you.
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Isablan Neva
Mystic
Join date: 27 Nov 2004
Posts: 2,907
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06-13-2009 16:32
There are a bunch of old freebie marble textures that were saved with an alpha channel. You are probably using one of those without knowing it.
Download the texture. Open it in any editor, save it as a 24 bit targa. Re-upload. Happiness.
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