Re: Peformer rendering

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Allan Schaffer (aschaffe)
Mon, 26 Sep 1994 12:19:51 -0700

On Sep 26, 10:49am, hodeckes++at++VNET.IBM.COM wrote:
>
> I am having problems with Performer rendering my scene incorrectly.
> Geometry which is behind other geometry is being drawn on top of the
> closer objects. In other words, a box positioned 2 km away from the
> viewpoint is being drawn on top of a box only 1km away.
>
> I create the geometry by adding a node containing geometry as a child
> to a pfSCS. I create this SCS with a matrix that I have scaled,
> rotated and translated. A section of the code follows. By the
> way, I have Performer 1.2, IRIX 5.2 and an Onyx with RE.

This problem may not be related to Performer, but rather an issue of
how much framebuffer space is available for Performer to allocate.
Check the output of 'perfly' to see if you are getting the mssize()
configuration you expect. You might also run 'gldebug' on your program.

On the same theme --

In IRIX 5.2 some of the System Administration tools (ie 'chost' and
'clogin') make use of the ImageVision library to scale & display
bitmaps of users faces & other pictures -- on RealityEngine this eats
up a lot of the frame buffer because it uses hardware acceleration.
So, if you run those tools and a Performer program at the same time,
you won't get any Z buffer. Once you kill them off and re-start the
Performer application it will be able to allocate the multisampling &
zbuffer memory it needs.

Allan

-- 
Allan Schaffer
Silicon Graphics
aschaffe++at++sgi.com

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