How can I move my object?

[Mars_999]

I can move one of my objects by calling setWorldTransform(), but for some reason some of my objects are not updating when I call setWorldTransform()?


What I have is coins falling from the sky and when they hit the ground or hit by the user, I want to randomly place them up in the air again at some other point. I tried doing this but no luck...

xform.setIdentity();
xform.setOrigin(btVector3(0,0,0));
mit->second->SetMatrixWorldTransform(xform);
mit->second->GetRigidBody()->clearForces();
mit->second->GetRigidBody()->setLinearVelocity(btVector3(0,0,0));
mit->second->GetRigidBody()->setAngularVelocity(btVector3(0,0,0));

I have looked at the BtRidgidBody and the value for getWorldTransform() remains unchanged even after I call setWorldTransform()? Would the object that hits the ground become inactive and not allow updates anymore?

Thanks

[justin]

I can move one of my objects by calling setWorldTransform(), but for some reason some of my objects are not updating when I call setWorldTransform()?


What I have is coins falling from the sky and when they hit the ground or hit by the user, I want to randomly place them up in the air again at some other point. I tried doing this but no luck...

xform.setIdentity();
xform.setOrigin(btVector3(0,0,0));
mit->second->SetMatrixWorldTransform(xform);
mit->second->GetRigidBody()->clearForces();
mit->second->GetRigidBody()->setLinearVelocity(btVector3(0,0,0));
mit->second->GetRigidBody()->setAngularVelocity(btVector3(0,0,0));

I have looked at the BtRidgidBody and the value for getWorldTransform() remains unchanged even after I call setWorldTransform()? Would the object that hits the ground become inactive and not allow updates anymore?

Thanks

so, what's the coordinate of the ground and the place you want to place the coin again?

[Mars_999]

Fixed it I used setCenterOfMassTransform()

Thanks

[Xuhai.Tang]

I used the similar code

iter->RigidBody()->setLinearVelocity((btVector3(iter->CentralVelocity().LinearX, iter->CentralVelocity().LinearY, iter->CentralVelocity().LinearZ)));
iter->RigidBody()->setAngularVelocity((btVector3(iter->CentralVelocity().AngularX, iter->CentralVelocity().AngularY, iter->CentralVelocity().AngularZ)));
iter->RigidBody()->applyForce(btVector3(fx, fy, fz), btVector3(px, py, pz));

It works well.

When did you watch the value? Maybe you should watch the motion after one step of simulation.

[Mars_999]

I used the similar code

iter->RigidBody()->setLinearVelocity((btVector3(iter->CentralVelocity().LinearX, iter->CentralVelocity().LinearY, iter->CentralVelocity().LinearZ)));
iter->RigidBody()->setAngularVelocity((btVector3(iter->CentralVelocity().AngularX, iter->CentralVelocity().AngularY, iter->CentralVelocity().AngularZ)));
iter->RigidBody()->applyForce(btVector3(fx, fy, fz), btVector3(px, py, pz));

It works well.

When did you watch the value? Maybe you should watch the motion after one step of simulation.

I am not sure if I called applyForce()....