Hi Tudor,

re:
> it uses a lot of moi.vectorMath.add()
> wanna ask what's the math behind that function ?

Like this:

var PtA, PtB, Result;

<......>

Result.x = PtA.x + PtB.x;
Result.y = PtA.y + PtB.y;
Result.z = PtA.z + PtB.z;


- Michael