Figuring out the mesh number is simple. All you do is count the number of openings in one linear inch of screen. This count is the mesh number. A 4-mesh screen means there are four little square openings across one inch of screen.
widthSegments — Number of segmented rectangular faces along the width of the sides.
If you're ok with a basic bounding box, you can use a THREE.Box3
var box = new THREE.Box3().setFromObject( colladaModel );
console.log( box.min, box.max, box.getSize() );
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