// fragment shader //

eg

gl_FragDepth = gl_FragCoord.z;

glDepthFunc( GL_XXXXX ); passes or fails
depending on what curent depthvalue compared to FragDepth

Thanks every one for replying,
Hi zedz,

In my pixel shader i tried to do gl_FragCoord.z<0.1
then only i am writing to gl_FragColor.
Then i am missing all material color and getting
some yellow color with flickring triangle for my
Collada car model.Actually it should discard some part
of my car model.
Regards,
Parmar.