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Depth testing with particles

Started by SinnDarin Feb 17, 2003 at 3:34 AM 3 replies 550+ views

Original Post

Feb 17, 2003 at 3:34 AM

Hi, I was wondering how I could render some particles without having the particle polygon borders shown.... I try something and desactivated depth testing: it looks great but since I wanted to use particles with a landscape engine I also need depth testing between particles and landscape... Does anyone know how to do this ? Thx Sinn

Thorin_nz

Feb 17, 2003 at 3:47 AM

well what I would do is first render all the solid objects, then turn on blending and render all the objects with DepthWriting disabled.

to disable depth writing add
glDepthMask(GL_FALSE);
to enable depth writing add
glDepthMask(GL_TRUE);

DepthTesting should always be on and the blend func should be set at...
glBlendFunc( GL_SRC_ALPHA, GL_DST_ALPHA);

Btw if im wrong, please correct me, (I only learned about glDepthMask(GL_TRUE); a few days ago

MirekCz

Feb 17, 2003 at 3:50 AM

Thorin is right.

for working source visit nehe.gamedev.net

SinnDarin

Author

SinnDarin

Feb 17, 2003 at 11:51 AM

Thx, but I already try this... It works well with particles themselves but not between particles and landscape, the result is that landscape parts don t occlude the ''normaly'' hidden particles.

_the_phantom_

496

_the_phantom_

Feb 17, 2003 at 1:21 PM

Depth testing on.
Depth writes off.
alpha blending on.

the above combination should do what you want as long as you do your particals AFTER the landscape has been rendered

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