Noob question about getting/setting position and orientation

[Adaline]

Hi,

I have to manage simple bodies represented by compound convex shapes.
I think I'm not using correctly motion states, the collisions are well detected, but responses are totally random

Here's what I do to get data :

Code: Select all

                        btTransform t;
			body->getMotionState()->getWorldTransform(t);
			btVector3 o=t.getOrigin();
			btQuaternion q=t.getRotation();

And for putting data :

Code: Select all

                                btTransform t;
				t.setIdentity();
				t.setOrigin(...);
				t.setRotation(...);
                                body->getMotionState()->setWorldTransform(t);

Has anybody get an idea ?

Thanks

[rewb0rn]

What you normally do not want to do in a physics engine is set orientations and positions directly because it will produce what you describe as random collision behavior. Instead you should apply forces or torque to achieve the desired behavior. Hope this helps.

[Adaline]

In fact I 'put data' on object creation only.
I solved the pb : it came from local inertia wrongly initialized
Thank you for the answer