Glen, I've gone back to our code, and it looks correct. I even verified it by examining the GroupRetained implementation (grossly inefficient, BTW, just as I had thought :-( ), and it indeed is an ArrayList that gets shortened from the top with stuff shifted down to fill the deleted object's spot. See: https://j3d-core.dev.java.net/source/browse/j3d-core/src/classes/ share/javax/media/j3d/GroupRetained.java?rev=1.11&view=markup So I'm at a loss. Any chance you could come up with a reduced example that exhibits the bug? I'd really like to see one. Sean On Oct 12, 2007, at 6:43 PM, Glen E. P. Ropella wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Sean Luke wrote: >> This has got to be a bug in SparseFieldProtrayal3D's updateModel >> method. I can see all sorts of evil places where there's likely a >> bug >> there -- the number one possibility is that globalTG.removeChild >> (t) may >> be operating in the middle of the for-loop over >> globalTG.numChildren(), >> which is probably not wise. :-) >> >> Unfortunately, I do not have enough time to look at this code and >> debug >> it for a week or more (grant proposal deadline). Gabriel might have >> time possibly. > > OK. I'll spend some time trying to track it down. If I find > anything, > I'll post it. Thanks! > > - -- > glen e. p. ropella, 971-219-3846, http://tempusdictum.com > If a man can't piss in his own front yard, he's living too close to > town. -- Tom Russell > > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.6 (GNU/Linux) > Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org > > iD8DBQFHD/iRZeB+vOTnLkoRAiHWAJ9Kyye36NFGIklnocSjTuHrDY8LfgCg16pC > Yya92t5CGO/5N3UCU4RX/+M= > =1y9Y > -----END PGP SIGNATURE-----