Real-Time Physics Simulation Forum

Doesn't that disable response for all objects? I still want my items to have a response with the world geometry, only not with the player. I have solved it now by deriving btCollisionDispatcher and adding a check in the needReponse function. I tried something like that and I 've got stuck with limi...

btCollisionShape is instanced object. One shape can be referenced by many collision objects.
That's why there is btTransform parameter in getAabb method. You should pass transform
of your body there.

personally, I found the same problem. Especially with large box it is terribly imprecious. Because whole waycast test is in fact sphere-sweep test with zero radius, I found it very inefficient too, so I rather implemented API for real ray-test and did implementation for some primitive shapes. I have...

Well, I've working RaycastVehicle for X-axis case. I had no time to implement it compatible with other cases, so it's not final solution. Here is the first change: void btRaycastVehicle::updateWheelTransform( int wheelIndex , bool interpolatedTransform) { btWheelInfo& wheel = m_wheelInfo[ wheelI...

the first problem is in this method: void btRaycastVehicle::updateWheelTransform( int wheelIndex , bool interpolatedTransform) on the start of computations there are fwd/right/up axes which seems to be OK and they correctly reflect any coordinate system. After multiplying them with rotations from wh...

I have the same problem and I need to solve it very quickly. I'll try to fix the btRaycastVehicle code, if nobody else did it

Just another reminder - I don't see "active objects set" in 2.75beta. It still iterates m_collisionObjects many times each simulation step. Atleast, I did myself simple modification to btDiscreteDynamicsWorld that I have separate container for rigid bodies thus many loops with such constru...

It's mostly unmodified Bullet, I have only couple of optimizations there. Anyway, the problem was activation indeed ;) Now I do this for all static objects: btCollisionObject* rb = new btCollisionObject(); rb->setCollisionFlags(btCollisionObject::CF_STATIC_OBJECT); rb->forceActivationState(ISLAND_SL...

Hi again, I just made small change, that "mp-nico" suggested, that I keep in btDiscreteDynamicsWorld pointers to only btRigidBody objects and I've got to these figures: ---------------------------------- Profiling: Root (total running time: 27.908 ms) --- 0 -- stepSimulation (99.94 %) :: 2...

Are you setting the computed localInertia to btRigidBody? Unless you do that, it's
considered to be static.

So, here are some figures. It's island with couple of thousands trees, represented as static collision objects (I used the hint you gave me, so I changed static stuff to btCollisionObject only) There is not any dynamic rigidbody. First, dumpAll on PC with 2.4GHz P4: ---------------------------------...

Wow! I completelly missed that btCollisionObject can be used in simulation, thank you for pointing it out. It will save me a lot of memory! Probably it would be good enough hack for speeding things up until there will be some real activeList - I can make another container of rigidBodies and iterate ...

I haven't tried to group them, as I cannot combine it with another features - streaming the world and reactions of every one tree, what could be difficult when they will be grouped. Furthermore, our collision shapes are built up from convex polyhedrons. It would be easier to implement active list my...

Hello, I have the same problem. In our scenes there are thousands of static trees and a few of dynamic objects. Most of CPU time is spent on *pointless* interating whole set of rigid bodies. There is not only problem with upcast, but also with cache saturation. On certain platforms (Xbox360) it's sl...