need information for basic Bullet elements

Hello, i just passed from Newton to Bullet. It look like better but more complex to use. So, the questions :

What does bodyRestitution in OgreBulletDynamics::RigidBody::setShape() function?

Does the mass in Kg, g or any other unity?

Same question but for distance(km, miles, m,...)

Thanks for your answers! (And sorry for my english )

Hi. I just finished successfully porting my engine from OgreNewt to pure Bullet, so I can probably help. You're correct in your observation about power vs complexity

Usually physics engines work in the standard units: meter, kg, second. But, you can probably change the weight and length units, as long as you're consistent.

I would recommend looking at the bullet documentation (http://www.bulletphysics.com/Bullet/wordpress/download) for specific information like what bodyRestitution does. I believe it has to do with at what speed threshold bodies will fall asleep.

As for differences between Newton and Bullet...

The newton world is replaced almost exactly with the bullet DynamicsWorld. There are a few extra steps in setting up a bullet world, such as choosing the algorithms, but these are mostly just for tweaking, and are explained well in the bullet demos.

Newton rigid bodies and geometries map almost exactly to bullet RigidBodies and CollisionShapes. You create a collision shape, give it to a body, and then add the body to the world.

The only really different part is the MotionState, which (since I'm not really familiar with OgreBullet) might be taken care of for you. It's what "links" the rigid body to your scene node.

Thanks a lot, subquantum!!!

I'm going to check the documentation right now.

AFAIK restitution = bounciness.

Yes, that's correct... I realized that I read it wrong It's from 0-1, and represents how much energy is reflected in a collision.

Thanks nikki!

I didn't find any thing in the documentation