karylo 0 Report post Posted September 17, 2018 A newbie with CannonJS, I want to have spheres collide with elasticity such that there is no loss of kinetic energy. All the spheres have the same physicsMaterial and the ContactMaterial has friction = 0.0 and restitution = 1.0. I was hoping that would give me 100% elastic collisions yet I see that the spheres lose significant energy with every collision. Is there something else I could or should be doing? TIA // Create a slippery material (friction coefficient = 0.0) // and very bouncy (restitution coefficient = 1.0) var physicsMaterial = new CANNON.Material("bouncyMaterial"); var physicsContactMaterial = new CANNON.ContactMaterial(physicsMaterial, physicsMaterial, 0.0, // friction coefficient 1.0 // restitution ); // We must add the contact materials to the world world.addContactMaterial(physicsContactMaterial); // CANNON body this.body = new CANNON.Body({ mass: this.mass, position: this.loc, shape: new CANNON.Sphere(this.radius), velocity: this.vel, linearDamping: 0, material: physicsMaterial }); Quote Share this post Link to post Share on other sites