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depth buffer

Started by ogl5 Apr 7, 2007 at 12:02 PM 1 reply 1k views

Original Post

Apr 7, 2007 at 12:02 PM

I was wondering if there is an easy way to make OpenGL only write to the depth buffer for non-transparent pixels. For instance, if you draw a quad with a picture of a tree, and parts of the quad are transparent, those parts will still affect the depth buffer even though they're transparent. I don't want the depth buffer affected by transparent pixels.

godmodder

Apr 8, 2007 at 4:17 AM

Hello,

I believe you are looking for the glDepthMask(GL_FALSE) command. You should use it while rendering the transparent objects and deactivate it while rendering your other geometry. Remember that you have to render your non-transparent geometry first and then your transparent geometry. You also have to sort your transparent geometry if you want them to render entirely correct.

Hope I've been able to help,
Jeroen

Kalidor

Apr 13, 2007 at 8:55 AM

Quote:
Original post by ogl5
I was wondering if there is an easy way to make OpenGL only write
to the depth buffer for non-transparent pixels.

Alpha test

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