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Preventing objects to go out of screen.


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Hello guys, i'm totally new to Babylon and I was wondering if there's a way to check if an object is hitting the border of the screen and prevent it to get off the screen.
This is what i wrote so far: http://www.babylonjs-playground.com/#SKWZP#0
I found these values manually, i hate to hard-code stuff inside my code but it was just for testing.

  if (box1.position.x > 6 ) {
    box1.position.x = 6;
  if (box1.position.y > 4 ) {
    box1.position.y = 4;
  if (box1.position.x < -6) {
    box1.position.x = -6;
  if (box1.position.y < -4) {
    box1.position.y = -4;

Can you please me help to understand how can i retrieve the screen boundaries wrt the viewport?

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you should use Vector3.Project (http://doc.babylonjs.com/classes/2.3/Vector3#static-project-vector-world-transform-viewport-rarr-vector3-classes-2-3-vector3-) to project the box position to 2d and then check against the current resolution

Other option: check if your mesh is in the active meshes by testing scene.isActiveMesh(mesh). If false then object is offscreen

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