physics_example.ts

import { Mesh, PhysicsImpostor, Vector3 } from "@babylonjs/core";

export default class BallComponent extends Mesh {
//...

    /**
     * Called on the node is being initialized.
     * This function is called immediatly after the constructor has been called.
     */
    public onInitialize(): void {
        this.physicsImpostor = new PhysicsImpostor(this, PhysicsImpostor.SphereImpostor, { mass: 1, friction: 0, restitution: 1 });
        this.physicsImpostor.sleep();
    }
    
     /**
     * Applies the start impulse. This is called on the game is started when the user presses
     * the space key on the keyboard.
     */
    public applyStartImpulse(): void {
        this.physicsImpostor.wakeUp();
        this.applyImpulse(new Vector3(45, 0, 45), this.getAbsolutePosition());
    }
    //...
}