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How to get glb mesh information?


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Hi, I'm trying to get the width and height of the imported object in my scene, but I got this error. "Cannot read property 'getBoundingInfo' of undefined"

and this is my code:

        var createScene = function(){

            var scene   = new BABYLON.Scene(engine);

            var camera = new BABYLON.ArcRotateCamera("Camera", -Math.PI / 2, Math.PI / 2, 4, BABYLON.Vector3.Zero(), scene);
            camera.attachControl(canvas, true);

            var front = BABYLON.SceneLoader.ImportMesh("", "model/", "front.glb", scene, function (meshes) {          
                scene.createDefaultCameraOrLight(true, true, true);
                var light1 = new BABYLON.HemisphericLight("light1", new BABYLON.Vector3(0, 0, -50), this.scene);
                var light2 = new BABYLON.PointLight("light2", new BABYLON.Vector3(0, 1, -1), this.scene);

                scene.executeWhenReady(function () {

                    var camera = new BABYLON.ArcRotateCamera("camera",  -Math.PI/2.1, 1.2, 45, 
                        new BABYLON.Vector3(4.85, -8.01, 3.93), scene);
                    camera.attachControl(canvas, true);
                    scene.activeCamera = camera;
                    engine.runRenderLoop(function() {


            scene.clearColor    = new BABYLON.Color4(0,0,0,0.0000000000000001);
            scene.ambientColor  = new BABYLON.Color3(1, 1, 1);

            var size = front[0].getBoundingInfo().boundingBox.extendSize;

            return scene;


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