Problems with gl_ClipVertex

OpenGL
1

Hi,
I’m trying to use the user clipping planes with a vertex&fragment GLSL program, but it doesn’t work.
I have read that you only have to set the gl_ClipVertex = gl_ModelViewMatrix * gl_Vertex;
and that’s all, of course, you have to set the clipping planes with glClipPlane (…) and activate it glEnable(GL_CLIP…).

Thanks in advance

2

Hello! I have the same problem as u…r u testing in ATI or NVIDIA boards? In ATI it works fine, even not specifying the clip vertex…but in NVIDIA…im waiting for a miracle to get it working…if u find any solution please email me
jcoluna@yahoo.com.br
See ya!

3

The current public NVIDIA drivers do not support the gl_ClipVertex output, this will work in Release 75 (75.80 and later) drivers.

As a workaround, you can write to the gl_ClipCoord output:

vec4 clipVertex = gl_ModelViewMatrix * gl_Vertex;
for (int i = 0; i < 6; i++)
    gl_ClipCoord[i] = dot(clipVertex, gl_ClipPlane[i]);

which is supported in current drivers.

4

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