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Background: I am reading the Babylon.js ebook - Chapter9 Collision, and find a line of code: var body = mesh.setPhysicsState(BABYLON.PhysicsEngine.BoxImpostor, {mass:0, restituion:0.5, friction:0.5});

This function will return an instance of the rigid body, i.e. Oimo.Body.  However, I run the code, and an error is raised, says the function setPhysicsState is undefined.

Question 1:  Is that true the function is removed from API forever?

Question 2: Once physics impostor is added to a mesh, e.g. sphere.physicsImpostor = new BABYLON.PhysicsImpostor(...), how can I move this mesh? Do I have to apply an impulse to the mesh or I can simply update the mesh position, such as sphere.positon.z += 1?


Thank you.


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Yes. The API has changed to:

sphere.physicsImpostor = new BABYLON.PhysicsImpostor(sphere, BABYLON.PhysicsImpostor.SphereImpostor, { mass: 1, restitution: 0.3 }, scene);

You can do both. But physics-engines prefer forces or impulses. You Can change the positions, but you "might" get into various issues with clipping through objects and the sorts.

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