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PocketMatrix • View topic - ZBuffer issues between ClassEDisplay->Render() and OpenGL
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ZBuffer issues between ClassEDisplay->Render() and OpenGL


ZBuffer issues between ClassEDisplay->Render() and OpenGL

Postby Planet9Dave » Jan 13, 2009 @ 2:44am

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Postby edge » Jan 13, 2009 @ 2:11pm

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Postby Planet9Dave » Jan 13, 2009 @ 9:29pm

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Postby edge » Jan 14, 2009 @ 12:07pm

Hi Dave,

EDGELIB renders models as they are stored in the 3D surface structure, no sorting or depth testing is done when OpenGL is enabled. Perhaps the moving of the objects will cause the z-buffer to mess up, because they are all rendered in the same position?

A good test to see if OpenGL is enabled in EDGELIB is to make a call to Perspective2D, followed by a call to Blt.
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Postby Planet9Dave » Jan 14, 2009 @ 9:25pm

First, the models handled via EdgeLib are -not- rendered at the same position -- different values for the translation, rotation and scale are computed for each model.

Second, the EdgeLib-rendered models are rendered correctly with respect to each other, depth-wise: they correctly pass in front of and behind each other, the depth errors are -only- between objects rendered directly with OpenGL calls, and objects rendered with EdgeLib calls.

Third, I'm happy to try your test of calling Perspective2D() followed by Blt(), but what behavior should I see if OpenGL is enabled vs. disabled?

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Postby edge » Jan 15, 2009 @ 8:48am

Hi Dave,

After reading your post I think the test is not neccessary anymore, because you can drawn an OpenGL scene correctly with working OpenGL functions.

In your sample you enable depth testing with the glEnable(GL_DEPTH_TEST) command. Unfortunately, I can't see the code which renders the OpenGL scene without the EDGELIB calls.

Perhaps depth testing is disabled in that part of the code? Also, make sure the z-buffer is actually filled with values. This can be specified with the glDepthMask(GL_TRUE) call. Another cause could be that the coordinate system isn't the same?
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Postby Planet9Dave » Jan 15, 2009 @ 11:34pm

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Postby edge » Jan 16, 2009 @ 8:56am

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Postby Planet9Dave » Jan 23, 2009 @ 5:12am

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Postby edge » Jan 26, 2009 @ 10:14am

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