Real-Time Physics Simulation Forum

just uploaded... engine is stable, gameplay is beta

https://play.google.com/store/apps/deta ... okk.solsys
thank you for looking at it!!

Have you opened an issue? I looked at C++ standard (open-std.org) and so far "<<" is undefined if on left side is negative value.
There is also one in btSoftBodyConcaveCollisionAlgorithm.h (line 48).
Thank you.

btCylinderShape *capsule = new btCylinderShape(btVector3(0,0.5,0)); you have to give the bounding box values for cylinder shape, no zeros here... I have tried to move the center of mass, but it does nothing, bullet cant have a center of mass that is not the center of the shape (at least that is wha...

Is there an easy way to approximate this in the bullet engine? the easiest way is to set linear/angular damping... To get more accurate results write some approximation of fluid resistance.. http://en.wikipedia.org/wiki/Drag_equation btScalar Cdrag = 0.5f * m_drag_coef * m_area * m_air_dens; btVect...

I have improved the safety of my allocations but it did not help. as far i can see you still allocate sizeof(CLASSNAME) memory for things like Core->dispatcher = new(Core->dispatcher) btCollisionDispatcher(Core->collisionConfiguration); ... it is wrong. Use aligned allocator. There is one in Bullet...

there is a 50% chance that the step simulation call crash with access violation not tested the code above, so not sure is the way trying to go good or not in general, but in particular it might be memory alignment issue... the idea.. (from btSimpleBroadphase.cpp) void* mem = btAlignedAlloc(sizeof(b...

What you get with getAppliedImpulse() is the recently applied impulse to satisfy contact constraints, it is not what you need. Anyway, you could also try to switch m_dynamicsWorld->getSolverInfo().m_splitImpulse = 1 / 0 in your experiments. Also you are calculating force=impulse/timeStep. It doesn't...

I have body with btCompoundShape, which contains many shapes. ... Our bodies can contain btBvhTriangleMeshShape. afaik btBvhTriangleMeshShape is not supported as child shape for compound, gimpact too.... (use convex hull). You can also use several submeshes in mesh shapes instead. Collision tests r...

for example like here, look for #ifdef USE_GHOST_OBJ_WITH_VEHICLE.. (BTW, word "ghost" doesn't mean Bullet ghost object, it can be any collision object). struct MyVehicleRayResultCallback : public btCollisionWorld::ClosestRayResultCallback { const btCollisionShape * m_hitTriangleShape; int...

i mean m_dynamicsWorld->stepSimulation(ms / 1000000.f,1,1./120.);
(not necessary 1 max substep)

but btRaycastVehicle does not support adding forces, nor disabling gravity. vehicle's chassis is a rigid body and you can apply forces or disable gravity. Where and how apply force depends on kind of force... To use some custom gravity model you may try to apply gravity per object. I have experimen...

body->setCcdMotionThreshold(0.00001); body->setCcdSweptSphereRadius(0.00001f); Not sure ccd motion clamp will help here, more likely it will harm, specially with the above values (microscopic squared velocity threshold and embedded sphere radius of 1/100000 m for 18 m sphere). Try increase internal...

I'm setting gravity to -9.81, as gravity should be and to just test whether the simulation is running at a realistic speed, dropping a car from 490.5 units up. With 1 unit = 1 meter the car should take bang on 10 seconds to hit the ground. This isn't happening. Can not confirm. Droping something fr...

afaik, only via controller

this works with 2.60a... may be there are better ways, don't know

http://bulletphysics.org/Bullet/phpBB3/ ... f=9&t=6683