How to get Z values from Z Buffer

StackOverflow https://stackoverflow.com/questions/4499999

  •  12-10-2019
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Question

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

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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).

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