Crash in btCompoundCollisionAlgorithm::calculateTimeOfImpact

[mreuvers]

Hi there,

When replacing my discrete world for a continuous world I get a crash in btCompoundCollisionAlgorithm.cpp line 300:

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btScalar frac = m_childCollisionAlgorithms[i]->calculateTimeOfImpact(colObj,otherObj,dispatchInfo,resultOut);

In debug mode also no assert is triggered

This is the callstack

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# btCompoundCollisionAlgorithm::calculateTimeOfImpact(btCollisionObject * body0=0x03001bc0, btCollisionObject * body1=0x0515b9b0, const btDispatcherInfo & dispatchInfo={...}, btManifoldResult * resultOut=0x0012e380)  Line 300 + 0x2f bytes	C++
# btCollisionDispatcher::defaultNearCallback(btBroadphasePair & collisionPair={...}, btCollisionDispatcher & dispatcher={...}, const btDispatcherInfo & dispatchInfo={...})  Line 269 + 0x28 bytes	C++
# btCollisionPairCallback::processOverlap(btBroadphasePair & pair={...})  Line 221 + 0x21 bytes	C++
# btHashedOverlappingPairCache::processAllOverlappingPairs(btOverlapCallback * callback=0x0012e734, btDispatcher * dispatcher=0x016e9028)  Line 383 + 0x13 bytes	C++
# btCollisionDispatcher::dispatchAllCollisionPairs(btOverlappingPairCache * pairCache=0x02f50860, const btDispatcherInfo & dispatchInfo={...}, btDispatcher * dispatcher=0x016e9028)  Line 235 + 0x17 bytes	C++
# btContinuousDynamicsWorld::calculateTimeOfImpacts(float timeStep=0.0083333338)  Line 124 + 0x39 bytes	C++
# btContinuousDynamicsWorld::internalSingleStepSimulation(float timeStep=0.0083333338)  Line 80 + 0x19 bytes	C++
# btDiscreteDynamicsWorld::stepSimulation(float timeStep=0.033333335, int maxSubSteps=2, float fixedTimeStep=0.0083333338)  Line 355 + 0x16 bytes	C++
# demolition::components::PhysicsWorld::stepSimulation(float p_timestep=0.033333335)  Line 326 + 0x35 bytes	C++

And my initalization code:

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m_collisionConfiguration = new btDefaultCollisionConfiguration();
	
// Use the default collision dispatcher. 
m_dispatcher = new btCollisionDispatcher(m_collisionConfiguration);
	
m_overlappingPairCache = new btDbvtBroadphase;
	
// The default constraint solver. 
m_constraintSolver = new btSequentialImpulseConstraintSolver;
	
// Initialise the physics world
m_dynamicsWorld = new btContinuousDynamicsWorld(m_dispatcher,
	                                              m_overlappingPairCache,
	                                              m_constraintSolver,
	                                              m_collisionConfiguration);

Anything I forgot?

Thanks!

Best,

Martijn

[ola]

Hi,

as far as I know, the continuous collision world is being worked on and isn't ready for use yet.

Best regards,
Ola

[mreuvers]

Well, that'd explain a lot Erwin, perhaps add an assert message stating assert(0, "Work in Progress, come back later"); With the current amount of documentation, it is very hard to track down what's finished, and what's not.

[pico]

Hi,

in the .h file Erwin wrote:

///Under construction, don't use yet! Please use btDiscreteDynamicsWorld instead.

[mreuvers]

A .h file... excellent documentation

Anyway, thanks for letting me know. Erwin is it useful to report these crashbugs? And is there an ETA on when the CCD is finalized? I've tried to search on Google code for that, but found a dead topic:

http://code.google.com/p/bullet/issues/detail?id=22