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How to update BabylonJS scene after changing some JS variables?


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We can render a scene in Babylon.JS reading values like position/scale from form fields. But does it allow to make changes in scene listening real time changes in input fields like $('input').val()

var cusotm_position = $('input').val();
canvas = document.getElementById("renderCanvas");
engine = new BABYLON.Engine(canvas, true);
scene = createScene(); //draws a mesh at custom_position 
engine.runRenderLoop(function () {

    cusotm_position = $('input').val();
    delete scene;scene = createScene(); //hangs website for few seconds,need its alternate

I tried to call scene.render();  on event listener of change in input but that doesn't seem to be doing anything. Is there anything like refrest/update to change to updated variable values. Better if this can be done without removing everything and recreating fresh scene. As delete scene;scene = createScene(); does refresh everything with new variable values but it hangs the website for few seconds.

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You don't need to refresh the scene.  If you change the position of a mesh, it will get updated in the scene automatically.

Like to move a mesh up or down - assuming input was numeric.  Put the change listener inside the createScene() method where you have a reference to the newly created mesh.

function createScene() {
  // you have your scene creation logic here and you create the mesh you want to move.

  var sphere = BABYLON.Mesh.CreateSphere("sphere1", 16, 2, scene);
  // Move the sphere upward 1/2 its height
  sphere.position.y = 1;

     cusotm_position = $('input').val();
     sphere.position.y = Number(cusotm_position)

  return scene;

You don't want to recreate your scene as that is a heavy task :)

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