From: Radomir Mech (rmech++at++engr.sgi.com)
Date: 04/26/2001 12:08:15
Hi Ian,
I had a similar problem and there is (will be) a fix in 2.4.1. To make sure that
it fixes your problem you could send me your code (preferably a simpler version
of it) and I can test it.
Radomir
ihawkes2++at++csc.com.au wrote:
>
> Hi,
> I am doing some work involving projected textures and I have noticed that
> at certain eyepoint positions, the second pass fails to draw anything
> except lightpoints. The vast majority of eyepoint positions work fine, but
> the problem occurs reliably at certain spots. There doesn't seem to be
> anything unusual in the scene at these spots that might be causing the
> strange behaviour. Moving the eyepoint fractionally away from the problem
> spots causes the problem to go away.
>
> In an effort to isolate the problem, I disabled my projected texture code
> and put the following code into the draw callback:
>
> pfDraw();
> glClearDepth( 1.0 );
> glClearColor( 0.0f, 0.0f, 0.0f, 0.0f );
> glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT );
> pfDrawScene();
>
> This resulted in the same problem occurring at the same eyepoint positions
> (ie no geometry except light points appearing in the scene at the problem
> spots). Using ogldebug32, it is apparent that the scene gets rendered
> normally on the first pass and then the display list is empty except for
> light points on the second pass.
>
> The problem goes away if PFCULL_VIEW is not set (ie no culling). The
> problem also goes away if I disable cliptextures (a virtual cliptexture
> with pre-cull callbacks to set cliptexture tile parameters and
> PFN_CULL_SORT_CONTAINED set).
>
> Can anyone think of any reason that the display list might be getting
> cleared (or draw bins getting emptied??) after the first pass?
>
> I am using Irix 6.5.8f and Performer 2.4 on an Onyx2 IR.
>
> Thanks,
> Ian Hawkes
> CSC Australia
>
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