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Transparency problem

Started by marrshal Feb 22, 2012 at 9:08 AM 0 replies 650+ views

Original Post

Feb 22, 2012 at 9:08 AM

I'm implementing a simple particle system. I draw a textured polygon where the particle is suposed to be. This texture has a transparent regions (in the edges). Here is the problem:

[attachment=7397:scr.JPG]

As you can see the in the transparent regions is draw the backround, not the part of the particle behind. During the rendering of the fountain I didn't disable depth testing or something similar.

Thanks in advance!

Brother Bob

Feb 22, 2012 at 11:18 AM

Transparency is draw order dependent; you need to sort your particles and draw them from back to front. But depending on the visual results you get by not sorting, you may get away with no sorting even though you technically do need it. In that case, you need to disable depth writes to ensure that particles closer don't block particles further away. Look into glDepthMask.

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