javascript - Dynamically change object dimensions in Three.js -


i using library dat.gui within three.js let user interact object , modify dimensions of mesh. of examples online using scale when want change mesh dimensions:

mesh.onchange(function(value){mesh.scale.x = value;});

the problem solution is not user friendly , requires adjust object.position when value changed. there other possibilities apart one? in case can post plausible alternative working example? in advance answers.

a clue solving question understand origin of object : @ object's geometric center or @ corner. depends on implementation of scale operation.

ignoring three.js minute, if done hand scale operation thought of 3 distinct operations :

1 - translate object center origin of world coordinates 2 - multiply vertex position matrix scale factor 3 - translate object original world location

so 2 assumptions need resolved : 

- ~center~ of object @ geographic center or    @ 1 of corners  - want scale (stretch) object expanding outwards    origin in dimensions or extend outwards retaining   current origin , ballooning shape outwards

what behavior need expressed ?

.... object.position needed depending on answer


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