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opengldepth-bufferzbuffer

How to get Z values from Z Buffer

I'm having problems with drawing in OpenGL and I need to see exactly what values are being placed in the depth buffer. Can anyone tell me how to retrieve these values? Thanks Chris

Solution

  • Use glReadPixels with format = GL_DEPTH_COMPONENT, for example:

    float depth;
glReadPixels(0, 0, 1, 1, GL_DEPTH_COMPONENT, GL_FLOAT, &depth);

    Will get the depth of pixel (0, 0).