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[solved]how to get boundingbox info of a parent mesh with all children size

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hi all,

i'm trying to calculate the boundingbox of a parent mesh, so that i may get a good camera asprect.

but failed to get the boundingbox size of the parent. are there any tricks there?

pg http://www.babylonjs-playground.com/#QVIDL9


// Our built-in 'sphere' shape. Params: name, subdivs, size, scene
    var sphere = BABYLON.Mesh.CreateSphere("sphere1", 16, 2, scene); 
    // Move the sphere upward 1/2 its height
    sphere.position.y = 1;

    // Our built-in 'ground' shape. Params: name, width, depth, subdivs, scene
    var ground = BABYLON.Mesh.CreateGround("ground1", 6, 6, 2, scene);

    var parent = new BABYLON.Mesh("parent",scene);
    sphere.parent = parent;
    parent.showBoundingBox =true;  


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