Real-Time Physics Simulation Forum

Re: Importing a .bullet file from Blender

2014-01-30T15:13:15+00:00

short Update:
I've managed to access the hinges and it's properties:

Code:

for(int i=0; i < dynamicsWorld->getNumConstraints(); i++){btTypedConstraint*constraint=dynamicsWorld->getConstraint(i);printf("  constraint type = %i\n", constraint->getConstraintType());printf("  collision shape type = %i\n", constraint->getRigidBodyA().getCollisionShape()->getShapeType());printf("  get partA axisVector (part of quaternion) = (%4.3f,%4.3f,%4.3f)\n",constraint->getRigidBodyA().getCenterOfMassTransform().getRotation().getX(),constraint->getRigidBodyA().getCenterOfMassTransform().getRotation().getY(),constraint->getRigidBodyA().getCenterOfMassTransform().getRotation().getZ());printf("  get partA CenterOfGeometry = (%4.3f,%4.3f,%4.3f)\n",constraint->getRigidBodyA().getCenterOfMassPosition().getX(),constraint->getRigidBodyA().getCenterOfMassPosition().getY(),constraint->getRigidBodyA().getCenterOfMassPosition().getZ());}

Although I still can't find a way how to access a constraint's related rigidbodies names (i.e. hinge->rigidBodyA->name and hinge->rigidBodyB->name).

Any thoughts on this?

Statistics: Posted by rob_marc2003 — Thu Jan 30, 2014 3:13 pm

Re: Importing a .bullet file from Blender

2014-01-28T18:13:18+00:00

I've managed to access rigid body properties via the following lines:

Code:

for(int i=0; i < fileLoader->getNumRigidBodies(); i++){btCollisionObject* obj = fileLoader->getRigidBodyByIndex(i);btRigidBody* body = btRigidBody::upcast(obj);// propertiesprintf("  object name = %s\n", fileLoader->getNameForPointer(body));// The Blender object name    printf("  get position = (%4.3f,%4.3f,%4.3f)\n", body->getCenterOfMassPosition().getX(),body->getCenterOfMassPosition().getY(), body->getCenterOfMassPosition().getZ());// Blender CoMprintf("  get local scaling = (%4.3f,%4.3f,%4.3f)\n", body->getCollisionShape()->getLocalScaling().getX(),body->getCollisionShape()->getLocalScaling().getY(),body->getCollisionShape()->getLocalScaling().getZ());// Blender Dimensionsif (body->getInvMass() == 0)printf("  static object\n");else{printf("  mass = %4.3f\n", 1/body->getInvMass());// Blender Massprintf("  get gravity (z!) = %4.3f\n", body->getGravity().getZ());// Blender Gravity}printf("\n");}

I still don't know how to access the contstraints (i.e. hinges) after importing the .bullet file. Any thoughts on that?

Cheers,
Rob

Statistics: Posted by rob_marc2003 — Tue Jan 28, 2014 6:13 pm

Re: Importing a .bullet file from Blender

2014-01-28T03:29:58+00:00

I would guess after import you can access the rigid bodies, joints, and shapes from the world interface and iterate all the information you need.

Statistics: Posted by Dirk Gregorius — Tue Jan 28, 2014 3:29 am

Importing a .bullet file from Blender

2014-01-27T17:00:07+00:00

Hi there,

After exporting a scene in Blender into .bullet file format according to this, I load the respective .bullet file in a simple application following the serialization wiki:

Code:

btBulletWorldImporter* fileLoader = new btBulletWorldImporter(dynamicsWorld);fileLoader->loadFile("h:\\testFile.bullet");

Question: how can I access rigid body parameters (like mass, dimensions, inertia etc.) in the Bullet world inside my program?

Thanks,
R

Statistics: Posted by rob_marc2003 — Mon Jan 27, 2014 5:00 pm