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How to read the z-buffer in a layer-backed openGL view?

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How to read the z-buffer in a layer-backed openGL view?

Subject: How to read the z-buffer in a layer-backed openGL view?
From: Mathieu Coursolle <email@hidden>
Date: Wed, 13 Aug 2008 11:16:10 -0400

Hi Cocoa developers,

I've been playing with this example for a while now:
http://developer.apple.com/samplecode/LayerBackedOpenGLView/listing2.html

and I was wondering if someone knew the answer to that question:

Is is possible to read the z-buffer (using glReadPixels) in a mouseDown procedure?

It seems to work fine if done in the drawing procedure, but not outside.

Thanks!

Mathieu

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