[info-performer] Re: pfNode::isect() on deep scenes.

New Message Reply Date view Thread view Subject view Author view

From: Bram Stolk (bram++at++sara.nl)
Date: 04/17/2002 04:12:27

On Thu, 11 Apr 2002 13:52:20 -0700 (PDT)
Yair Kurzion <yair++at++polygon.engr.sgi.com> wrote:

> Hi Bram !
>
> Can you please send me a short sample code demonstrating the crash ?

Find attached the minimalist bug-demonstrator 'deep_isect'

Bus errors, Segm Violation, Hangs, I can generate just about any error
condition by intersecting deep trees.

If I put 28 or more DCSes between the pfScene and esprit.pfb's geometry, I
can make my app crash. (My guess is that esprit.pfb has 4 levels, plus
the pfScene, plus the 28 DCSes equals a pfPath length of 33 which exceeds 32
which I suspect is the hard coded limit in pf's isect code)

Sometimes I get very cool and exotic error messages like:
PF Warning/Resource(2): _pfNewDLName: couldn't allocate GL display lists.
or:
Trace/BPT/RangeErr/DivZero/Ovflow trap (core dumped)
or:
PF Warning/Usage: pfMemory::realloc() can't realloc from non-pfMemory data
Bus error (core dumped)

(dbx) where
> 0 pfNode::pf_isect(pfSegSet*,pfHit***,pfChannel*,pfMatrix*)(0x1, 0x7fff2c98, 0x3, 0x7fff2c8c, 0x7fff2380, 0x0, 0x1, 0x0) ["/build/perfbuild/perftot1/perf/lib/libpf/pfNode.C":1488, 0x41fd9e4]
   1 pfNode::nb_isect(pfSegSet*,pfHit***)(0x1, 0x0, 0x1, 0x7fff2c8c, 0x7fff2380, 0x0, 0x1, 0x0) ["/build/perfbuild/perftot1/perf/lib/libpf/pfNode.C":875, 0x41fbfe0]
   2 pfNode::isect(pfSegSet*,pfHit***)(this = 0x640a1640, segSet = 0x7fff2840, hits = 0x7fff2c90) ["/usr/include/Performer/pf/pfNode.h":193, 0x1000394c]
   3 ::do_isect(pfScene*)(scene = 0x640a1640) ["/home/sara/bram/tmp/isect/simple.cxx":46, 0x10002ccc]
   4 ::main(argc = 1, argv = 0x7fff2ed4) ["/home/sara/bram/tmp/isect/simple.cxx":150, 0x100032d0]
   5 __start() ["/xlv55/kudzu-apr12/work/irix/lib/libc/libc_n32_M4/csu/crt1text.s":177, 0x10002758]

This only happens with PFTRAV_IS_PATH enabled.

I hope you can still fix this one before pf3.0 comes out.

  Bram 

-- 
------------------------------------------------------------------------------
 Bram Stolk, VR Specialist.
 SARA Academic Computing Services Amsterdam, PO Box 94613, 1090 GP  AMSTERDAM
 email: bram++at++sara.nl   Phone +31-20-5923059  Fax +31-20-6683167

 "I heard if you play the NT-4.0-CD backwards, you get a satanic message."
 "Thats nothing, if you play it forward, it installs NT-4.0"
------------------------------------------------------------------------------

New Message Reply Date view Thread view Subject view Author view

This archive was generated by hypermail 2b29 : Wed Apr 17 2002 - 04:12:59 PDT

This message has been cleansed for anti-spam protection. Replace '++at++' in any mail addresses with the '@' symbol.