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Make the btDbvtBroadphase deterministic/reproducable, by sorting the btBroadphasePair using unique ID, instead of proxy address.

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The btAxisSweep3 didn't suffer from this issue, because proxies were always allocated in-order, as part of an array.
This commit is contained in:
erwin.coumans
2008-12-08 20:16:29 +00:00
parent 65cdd7146f
commit 6db1b932fd
5 changed files with 16 additions and 27 deletions
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6
src/BulletCollision/BroadphaseCollision/btDbvtBroadphase.cpp
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@@ -100,7 +100,8 @@ struct btDbvtTreeCollider : btDbvt::ICollide
btDbvtProxy* pa=(btDbvtProxy*)na->data;
btDbvtProxy* pb=(btDbvtProxy*)nb->data;
#if DBVT_BP_SORTPAIRS
if(pa>pb) btSwap(pa,pb);
if(pa->m_uniqueId>pb->m_uniqueId)
btSwap(pa,pb);
#endif
pbp->m_paircache->addOverlappingPair(pa,pb);
++pbp->m_newpairs;
@@ -411,7 +412,8 @@ void btDbvtBroadphase::collide(btDispatcher* dispatcher)
if(!Intersect(pa->leaf->volume,pb->leaf->volume))
{
#if DBVT_BP_SORTPAIRS
if(pa>pb) btSwap(pa,pb);
if(pa->m_uniqueId>pb->m_uniqueId)
btSwap(pa,pb);
#endif
m_paircache->removeOverlappingPair(pa,pb,dispatcher);
--ni;--i;