Hi everybody. While I learn babylon101 10th course, there is a question: course link: https://doc.babylonjs.com/babylon101/cameras,_mesh_collisions_and_gravity code link: https://www.babylonjs-playground.com/#U8MEB0 The course says "your camera is going to fall on the y-axis until it collides with the ground". Then I changed the code in the line 9th. from: var camera = new BABYLON.FreeCamera("FreeCamera", new BABYLON.Vector3(0, -8, -20), scene); to : var camera = new BABYLON.FreeCamera("FreeCamera", new BABYLON.Vector3(0, -5, -20), scene); Now the camera does not "fall on the y-axis", it stay in the "air". Why? There is different with expectation. How understand the "gravity"? Or it is a bug? Thank you for your help.