[ODE] ODE 0.8.1 RC1 released

[Oleh Derevenko]

Hi Guys,

Do you ever check the stuff you commit?
You have added that "new trimesh-to-trimesh collision algorithm" which uses 
32bit hash derived from contact position coordinates up to 4th digit after 
decimal truncated to range -1677..1677 as THE ONLY CRITERION OF CONTACT 
COINCIDENCE.  This is 3x24-bit of hash input data and simple shuffling 
algorithm of unknown origin which produce 32-bit output. How do you think, 
how long it will take until somebody gets a hash collision and merges 
completely different contact points together?
Also, if there is a contact node key buffer overflow, the new contact 
replaces the last slot in the hash table and thus it is possible to get two 
matching contacts not recognized and both added to contact list.
Is it really worth to add speed improwements at this cost?

Oleh Derevenko
-- ICQ: 36361783

----- Original Message ----- 
From: "Bram Stolk" <b.stolk at gmail.com>
To: "dan miller" <danbmil99 at yahoo.com>
Cc: "ode-list" <ode at ode.org>
Sent: 6 вересня 2007 р. 05:57
Subject: Re: [ODE] ODE 0.8.1 RC1 released


> Dunno, I closed this patch, because in the comment
> by hidden_asbestos, it was claimed that #1175 fixed this.
>
> You can see the 1175 edit here:
> http://opende.svn.sourceforge.net/viewvc/opende/trunk/ode/src/heightfield.cpp?r1=1166&r2=1175
>
> I'll re-open the patch if you think it does not correspond to the patch.
>
>   bram
>
>
> On 9/5/07, dan miller <danbmil99 at yahoo.com> wrote:
>> hi all --
>>
>> I'm helping to integrate ODE with the opensim project
>> (http://openmetaverse.org/wiki/OpenSim), as well as at work building a
>> robotics simulator.
>>
>> I've been using this patch:
>>
>> https://sourceforge.net/tracker/?func=detail&atid=382801&aid=1691402&group_id=24884
>>
>> but it appears not to be in 8.1.  Can someone confirm that the bug this
>> patch is meant to fix has been dealt with?  It had to do with some 
>> strange
>> edge cases where objects would not generate contact with the heightfield.
>>
>> -dbm
>>
>>
>> --- Jason Perkins <starkos at gmail.com> wrote:
>>
>> > The first release candidate for 0.8.1 is now available on SourceForge.
>> > Great work everyone! Here's the changelog:
>> >
>> >
>> > Changelog 0.8 -> 0.8.1 (svn revision 1208)
>> > ==============================================
>> >
>> >
>> > Apply SF patch 1685107: Enforce 1 contact request
>> >
>> > Apply SF Patch 1697014: Update JointPR code
>> >
>> > Catch SF BUG 1621938: gimpact only does stride 12.
>> >
>> > Fixed typo, added asserts
>> >
>> > Fix build instructions
>> >
>> > bumped version nr to 0.8.1-rc1
>> >
>> > patch 1769851 by Jon Watte: recalc aabb when new setting new data
>> >
>> > Add some comments and try to understand the gimpact stack
>> >
>> > Fixed disabling in hash space. SF bug 1693383
>> >
>> > Added Richard Barrington's model loader for XNA (to be used with 
>> > ODE.NET)
>> >
>> > Fixed warning (in VS2005): Conversion from 'time_t' to 'unsigned int',
>> > possible loss of data.
>> >
>> > Update project files to support new trimesh collider
>> >
>> > [ 1586733 ] collision_trimesh_trimesh.cpp OPCODE fix
>> > Added Francisco Leon's alternate trimesh-trimesh collider.
>> > "#define dTRIMESH_OPCODE_USE_NEW_TRIMESH_TRIMESH_COLLIDER 1" to
>> > activate it (default off)
>> > See mailing list for details.
>> >
>> > Fix for int assigned to float without cast warning.
>> >
>> > Removed makefile.am reference to "odecpp_old.h"
>> >
>> > [ 1699009 ] odemath.h dVALIDATEVEC4(v) macro
>> >
>> > [ 1667375 ] Really small optimization in joint.cpp
>> >
>> > [ 1691402 ] Heighfield performance patch patch
>> >
>> > Fix two bug introduced in last patch and reported in mailing list :
>> > - Ray segfault on tagential cases
>> > - XZ oriented terrain that was letting object falling through and made 
>> > the
>> > reporter uses previous implementation.
>> >
>> > [ 1696933 ] Fix bug in dWorldExportDIF when joint in "limbo"
>> > Patch to fix NULL pointer dereference for 'limbo' joints, by Remi 
>> > Ricard
>> >
>> > PRGetInfo2, remove unused variable 'int i' to fix compiler warning.
>> >
>> > removed old cruft
>> >
>> > Added unit tests
>> >
>> > ode/test renamed to ode/demo
>> >
>> > Renamed "tests" to "demos" and split out unit test project. Updated
>> > premake scripts and Visual Studio files; automake files still need to
>> > be updated.
>> >
>> > Make building tests optional. SF patch 1650563
>> >
>> > lib64 fixes, SF patch 1646598
>> >
>> > added test_jointPR (sf patch 1654464)
>> >
>> > Warn against using double precision with gimpact
>> > _______________________________________________
>> > ODE mailing list
>> > ODE at ode.org
>> > http://ode.org/mailman/listinfo/ode
>> >
>>
>> _______________________________________________
>> ODE mailing list
>> ODE at ode.org
>> http://ode.org/mailman/listinfo/ode
>>
>
>
> -- 
> Zapp: Captain's log, stardate...er..
> Kif: Ohhh. April 13th.
> Zapp: April 13th. Point 2.
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