Real-Time Physics Simulation Forum

Hi,
I am creating a hinge joint which can be broken by applying a breaking impulse. Now , I want to add the hinge joint back between the object in runtime. How do I go about it?

Thanks,
W

Here is how you load a tri mesh in bullet regardless of the format.. btRigidBody* BulletWrap::addTriangleMesh( btVector3 &p0, btVector3 &p1, btVector3 &p2,btVector3 &position, bool useQuantizedBvhTree,btVector3 &inertia, btScalar mass, btScalar restitution, bool collision ) { btT...

I made a simple soft body simulation with 3 soft spheres and tried stepping the physics at a high rate. When the soft bodies are rendered with flat face normals,everything looks fine but when I render them with vertex normals, I see some weird artifacts in the rendering. Here is my render function.....

Meshes can be displayed as concave dynamic, static and convex-decomposed bodies in Bullet. For "dynamic Concave meshes" look at btGImpactMeshShape. For "static mesh objects" , create the mesh using btBvhTriangleMeshShape and use the btCollisionShape to create the btRigidBody. Fin...

I am currently able to render and run a soft cloth but how do I change the parameters on the fly during the demo. I want to access and change parameters like Linear stiffness, angular stiffness, volume stiffness etc. How do I access and change the material properties of the soft body after its creat...

How do I apply force and torque to a soft body about its centroid?

Just use the void pointer available for each body using setUserPointer and getUserPointer. Since it is a a void pointer you can tag the body with anything.

I am planning to make a motorcycle racing game and want to know how I can adapt the btRaycastvehicle for it. I want to first get the mechanics right , so was wondering if anyone could provide hints.
Any help or advice would be great.

I know there are many car race games using Bullet. Are there any motorbike games / simulations using bullet ?

Thanks
V

I would also like to know the answer to this question. Anyone got the answer ???

I know the answer to the softbody problem that dphil mentions here. You dont have to increase damping to solve this. All you have to do is to set the proper number of clusters that are used to solve the soft body. You have to figure this out based on the number of nodes and elements a soft body cont...

When I try to un-freeze it, it still acts as a static body i.e. applying force has no effect on the object.

Are you sure this works for you because I tried it, I was able to freeze it but was not able to un-freeze my object later during the simulation.

Is there any good function to freeze and un-freeze rigid bodies on the fly?
In Nvidia Physx, you can set the body flag to be NX_BODY_FROZEN and it will just freeze.
I am looking for a similar feature in Bullet. What is it?

Thanks

Just get the pointer to vertex indices and pointer to vertices and pass it to the following function. m_world is nothing but pointer to btDynamicsWorld. Hope this helps. btRigidBody* addConcaveMesh(int numTriangles, int *indices, int numVertices, float *verts, btVector3 &position, btVector3 &...