Hi,
We tracked down a problem that occurs on TNT cards when drawing
triangle strips using glDrawArrays with a non-zero starting index. In
the Java 3D 1.1.2 release, which should be on the web sometime this
week (today, if all goes well), we have put in a workaround for this
bug.
--
Kevin Rushforth
Java 3D Team
Sun Microsystems
[EMAIL PROTECTED]
>Date: Mon, 07 Jun 1999 14:26:28 -0400
>From: "Stephen M. Jones" <[EMAIL PROTECTED]>
>To: Java3D <[EMAIL PROTECTED]>
>Subject: [java3d] NT Video Card Problems/TNT2
>
>Hello,
>
> So I got a (Diamond V770 )TNT2 and downloaded jdk1.2.2 to attempt to
>fix
>a memory leak I was seeing. I mistakenly installed Java3D 1.1. I ran
>the gearbox
>test and the centers of the gears were not drawn ( as many of us has
>seen ).
>Realizing that I made a mistake by not installing Java3D 1.1.1, I
>installed
>the update and reran the gearbox. This time most of the gears were drawn
>
>with a few missing triangles in the teeth.
>
>It looks as though J3D 1.1.1 fixes a few of these video card errors.
>Is sun actively persuing a fix for this error or has the problem been
>offloaded to the video card manufactures.
>
>It seems that triangle strips are the problem, so I am in the process of
>
>removing them from my program so I can use the TNT2 card for an upcoming
>
>demo. I believe I am using IndexedTriangleStrips in my program and they
>seem
>to work correctly ( lit, unlit, textured and untextured ). Has anyone
>figured
>out exactly what the cause of the rendereing bug is?
>
>This bug almost reminds me of an old SGI bug, where
>using the same array to send the point could result in
>the new point being sent (twice) instead of the old
>values in the array. A solution was to use a different
>array to hold the next point/normal/etc passed to the
>function call.
>
>
>Steve
>
>--
>------------------------------------------------------------
>Stephen M. Jones Solipsys Corporation
>Director of Visualization (301) 483-8912
>------------------------------------------------------------
>
>
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