Is the mesh that you export from Unity also just a cube or does it already have blendshapes?
My suspicion is that there’s different data in THREE.BoxGeometry and the geometry that you have on that gameobject
As Felix said - it depends on what you export. You can not assume the geometry to be what BoxGeometry contains / adds. Something is missing - what’s why I asked you to check with the debugger (or console log) and compare both objects 
You can add
console.log(this.gameObject.geometry); on the left and console.log(geometry); on the second line left and right and check in the console what data they contain.
Or, as Marcel keeps saying, make a breakpoint and check directly
You’re right
by user 224464722878005248
But all of the gameObject of type mesh export on Needle are BufferGeometry 
by user 224464722878005248
check what’s inside, e.g. how are the vertices, does it have weights already, …
BoxGeometry is just a special type of BufferGeometry that, well, has box data
if you click the little arrows on the left you can dig deeper into these objects and compare
Okay thanks, I will inspect it
by user 224464722878005248
By the way not sure if you’re aware, you can also export geometry with morph targets and so on and just animate them or change them (instead of doing all the manual setup)
Success !
by user 224464722878005248
it was only about this line :
by user 224464722878005248
this.gameObject.updateMorphTargets()
by user 224464722878005248
Like create Morph target directly on Unity / Blender and save it as animation ? 
by user 224464722878005248
Yeah… my script doesnt works well if I copy a mesh, modify it and add it as parameter to use it as Morph Target…
The original setup :
by user 224464722878005248
