Basketball game: update ball

demos/basketball/src/entities/ball.js

 import { GameEvent } from '../core/events.js';
 
 /** Radius of the ball */
-const BALL_RADIUS = 0.27;
+const BALL_RADIUS = 0.275;
 
 /** Minimum distance for scoring 3 points */
 const THREE_POINT_THRESHOLD = 6.0;
 
         // create the root node
         const physicsRoot = BABYLON.MeshBuilder.CreateSphere('Ball', { diameter: 2 * r });
+        physicsRoot.isVisible = false;
         physicsRoot.addChild(mesh);
 
         physicsRoot.physicsImpostor = new BABYLON.PhysicsImpostor(physicsRoot, BABYLON.PhysicsImpostor.SphereImpostor, {