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Stencil Buffer Bug

Started by Thomas Obermaier May 28, 2004 at 5:19 AM 2 replies 750+ views

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May 28, 2004 at 5:19 AM

Hi there! I'm currently playing around with "Planar Projection Shadows" but since 2 days i'm stuck with a problem concerning the stencil buffer. I project my objects onto the ground plane with all neccessary parameters set (like in the stencil paper from Mark Kilgard). Everything works fine as long i don't resize my OpenGL Application to something above ~1280*800 ... After that i get such errors: http://www.thomas-obermaier.de/stencil_bug.jpg I am using a notebook with a resolution of 1920*1200 (ATI Mobility Radeon 9600 Pro Turbo with latest drivers installed) A friend told me there are some bugs in the ATI drivers that cause such strange patterns. Is this true? Are there some workarounds? Thanks in advance, Thomas [edited by - Thomas Obermaier on May 28, 2004 6:21:20 AM]

Thomas Obermaier

Author

Thomas Obermaier

May 28, 2004 at 5:34 AM

Addition:

I did some tests: Everything above 1280 * 1024 fucks totally up. This occurs only on this ATI card. I tested it on a GeForceFX5900 and everything ran fine.

Hum... I really suspect a bug in the drivers....

Thomas

Thomas Obermaier

Author

Thomas Obermaier

Jun 1, 2004 at 1:17 AM

Ha!

This bug only occours on my Radeon Mobile 9600 PRO TURBO (most recent driver). It works fine on every NVidia and Desktop ATI (like R9600SE)

I wrote ATI for that, but no reply :/

Best Regards,
Thomas

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