Usage: Hover mouse above the point you want to select, and on a selected point you can adjust the x, y, z coordinates and the weight of that point, all of these are feasible by scroll up / scroll down on the corresponding part of the appearing popup. Disappear popup: mouse click. Camera moving around the object: dragging with left mouse button. Camera moves: dragging with right mouse button, original position: middle mouse button. Zoom in / out: wheel up / down.  Source code