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Alpha Bended Picture

 
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Triplle
DeleD PRO user


Joined: 05 Jul 2008
Posts: 95
Location: Netherlands

PostPosted: Thu Oct 02, 2008 7:55 pm    Post subject: Alpha Bended Picture Reply with quote

I've got a question.

I've made an alpha bended picture but when i place it on 2 flat poly's rotated in 90 degrees Z angle i get this:


how can i get it fixed ?
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Paul-Jan
Site Admin


Joined: 08 Aug 2004
Posts: 3066
Location: Lage Zwaluwe

PostPosted: Thu Oct 02, 2008 8:47 pm    Post subject: Reply with quote

Technically: Alpha-blended images have to be depth-sorted manually, because you can't use the z-buffer for them (because then the parts that are behind any other part simply wouldn't be drawn at all).

This means that every polygon is either completely in front, or completely behind any other polygon. So if you stick one polygon straight in the middle of another one, you are going to get problems like the ones in your screenshot.

To solve your problem, split the polygon in half, resulting in 4 polygons that meet in the center. This is best practice in modeling anyway (don't simply push polygons through one another, create edges) , and will solve the visual inconsistencies.

Hope that helps. This is a bit of generic modeling knowledge, if you want to learn more about it, google has a lot of information, like the OpenGL documentation on the topic.
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Triplle
DeleD PRO user


Joined: 05 Jul 2008
Posts: 95
Location: Netherlands

PostPosted: Fri Oct 03, 2008 7:51 pm    Post subject: Reply with quote

thankyou very much,

this helps alot and i will never forget it again Very Happy


my work gets better every scene just coze u guys help really good... Very Happy



greets triplle
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