How to dynamically change paramters (options) of a mesh?

Questions
1

I’ve got a box and I’ve set its options (width, height, facecolors…). Now I want to change the colors at a pickEvent, but I don’t know how to access them? is it even possible? Or are these options just used to build the mesh and thereafter useless?

https://www.babylonjs-playground.com/#ICZEXW#118

options (line 29)

 var options = {
        width: 10,
        height: 3,
        depth: 5,
        faceColors: faceColors
    };

pickEvent (line 42)

 scene.onPointerDown = function (evt, pickResult) {
        if (pickResult.hit) {
          //box.options.faceColors[4] = 15; // doesnt work
        //  box.faceColors[4] = new BABYLON.Color4(255, 255, 255, 1); // doesnt work
       //  faceColors[4] = new BABYLON.Color4(255, 255, 255, 1);// doesnt work
           console.log("HIT")
        }
    };
2

I just found the parameter “updatable” and added ti to the options, but nothing changes? How is it meant to work?

https://www.babylonjs-playground.com/#ICZEXW#121

3

Correct, just on build. For width, height and depth you can use the scaling property https://www.babylonjs-playground.com/#ICZEXW#120

For colors you would need make the box option updatable = true and update the vertex data colors directly https://doc.babylonjs.com/how_to/updating_vertices