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Anniella Winx
Virtual addict
Join date: 12 Jan 2007
Posts: 86
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07-07-2007 13:37
I don't know if this only happens to me or if others see it too and I don't know whether it happens because of my graphics card, drivers, computer or whatever.
If I have a solid coloured object, for example a black pillar standing behind a transparent object, for example a table made of red glass, the pillar not only bleeds through the glass table, which it should, but the black appears to be in front of the table although it's standing behind it. Normally, irl, you'd see the black pillar through the red transparent glass but not as if the glass was behind the pillar.
This is hard to explain but I hope you understand what I mean and I hope someone can explain why this happens and if there's something I can do to avoid it to happen. I still want to use transparent objects but this doesn't look very good. It seems like solid objects are dominant somehow.
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Chosen Few
Alpha Channel Slave
Join date: 16 Jan 2004
Posts: 7,496
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07-07-2007 15:37
Does your black pillar have a 32-bit texture on it? If so, then what you're describing is the infamous alpha sorting glitch. This is not a problem with your computer or with SL. It happens in every 3D application, from video games to high end modeling & animation programs costing thousands of dollars.
When two objects with 32-bit textures overlap in close proximity, the renderer has trouble determining which one to draw first. Most commonly, the object whose center point is closest to the camera will appear to jump in front of the one whose center is further away. As you change your point of view, the two objects can appear to switch positions.
Put a 24-bit texture on the pillar and make sure there's no transparency assigned to it in the editor, and you'll find the problem will stop.
For more info on alpha sorting, see the transparency guide at the top of the forum (apologies that it's become a little hard to read since LL turned off bbCode on the forums).
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Anniella Winx
Virtual addict
Join date: 12 Jan 2007
Posts: 86
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07-08-2007 00:41
Thanks for the info about alpha sorting. It seems to be the problem in my case as the pillar is a 32 bit image and they also often seem to switch positions as soon as I move the camera. I will try what you suggested right away  |