From: Angus Dorbie (dorbie++at++sgi.com)
Date: 12/12/2000 12:48:04
Well cliptexture is tested and working. Someone else suggested zbuffer,
I think that is probably a good bet, watch how you select your visual,
visual ID's change from pipe to pipe in mysterious and arbitrary ways so
attributes are the way to go, in addition too few RM's, big managed
areas & expensive attributes can bite you.
The only slightly worrying thing is the black buildings, hopefully it's
because the buildings have back facing surfaces internally which
overwrite the exterior facade due to depth test fail.
Cheers,Angus.
"Guillermo E. Gutierrez" wrote:
>
> Greetings,
> We have a program that loads very large 3d urban models (buildings,
> terrain, etc) which are also generated inhouse. The program makes
> extensive use of cliptextures since the models are photorealistic and
> geospatially accurate (i.e., not repeating geometry or textures).
> Anyway, the program worked fine on our onyx2 ir2 running IRIX6.5.7f.
> However, we recently took the software to the Orlando SGI office where
> they had an onyx3200 ir3 running IRIX6.5.9(f?) just to see if
> everything would work ok. Well, it didn't. The program runs and the
> cliptextures seem to page in and out too (we can dynamically move the
> clipcenter) but everything only looks ok when the clipcenter is moved
> out to a very specific spot and the camera is not moving. While
> flying around the model (with a FlyBox), some of the back buildings
> appear in front of the front ones (the front ones are still visible)
> and many of the buildings are black (no textures). We have since
> recompiled the app on an O2 running 6.5.9f (I don't want to upgrade
> our onyx2 until this gets resolved) and retested it on an onyx2 ir2
> running 6.5.9 (the one running the HDTV at the SGI booth at I/ITSEC,
> actually) and gotten the same result. Therefore, it's not a hardware
> issue (between ir2 and ir3). We think something might have changed in
> either the way z-buffers or alpha blending is handled between the two
> OS's (performer versions?).
> Any light shed would be greatfully appreciated.
> Thanks,
> -guillermo, ggutierr++at++harris.com
> Harris Corporation
>
> P.S. Incidentally, I really enjoyed the Friends of Performer meeting
> at I/ITSEC.
-- For Performer+OpenGL tutorials http://www.dorbie.com/"In the middle of difficulty lies opportunity." --Albert Einstein
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