Re: Triangle Troubles

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Rob Jenkins (robj++at++quid.csd.sgi.com)
Wed, 3 Jun 1998 09:19:38 -0700

On Jun 3, 4:20pm, Uwe Pachler wrote:
> Subject: Triangle Troubles
> Hello!
>
> We run an O2 with CRM graphics and a R10000 with Performer 2.0 and IRIX
> 6.3. We run a performer application that simulates an industry environment
> where the user is able to put on helmets and gas masks.
> The problem is that performer sometimes doesn't draw the whole area of a
> triangle, if the triangle seems to be bigger than the screen (maybe a
> clipping problem?)
> For example, if the user wears a gasmask, the mask, consisting of
> transparent polygons, covers the whole screen. The scene behind it is
> visible of course because the mask is drawn transparently. Sometimes,
> parts of the mask are not drawn. But not a whole triangle is missing, but
> only triangular parts of a triangle, where one side of that missing
> triangle is the screen's border (that's why I assume it is clipping bug in
> the graphics library).
> Has onybody heard before from this bug, or has even fixed it?
>
> Thanks in advance,
> Uwe Pachler
>
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>-- End of excerpt from Uwe Pachler

If Svend's suggestion doesn't help then there are a couple of ( mostly
old/fixed ) bugs that might be related to this. It sounds to me like you're
describing triangular sections dropping in/out rather than something where the
problem is constant. Without a test case it would be hard to narrow down what
problem you have, if it is a known thing so I suggest that you first make sure
you have the latest O2 gfx patch ( actually, get the latest patchset from
www.sgi.com/support ), any recent fixes will be in there and I also remember
that there was an O2 gfx patch that was found to be bad and got yanked, some
people might have it though. That was patch 1604. the latest O2 gfx patch is:
2943 although I'm not sure that is in a patchset yet, the latest in a patchset
is probably patch 2862 and you should get at least that. If the patches and
examination of your viewing frustum setup don't help then you ought to log a
support call, ideally with some testcase they can use.

Cheers
Rob

-- 
________________________________________________________________
Rob Jenkins mailto:robj++at++sgi.com
Silicon Graphics, Mtn View, California, USA
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