You could say that my problem is just like this guy's How to get object in WebGL 3d space from a mouse click coordinate, but there are some differences that prevent me from applying those solutions.
Let's say I have an java.awt.Canvas that contains several 3D parallelepiped (??) objects. I want to implement control points. This means that when i click near an edge or a corner (inside or outside of the object, corner or edge selection mode), considering a level of tolerance, to draw a dot and retain its coordinates.
I am not interested in selecting the first object (so I would use ray/triangle intersections), i want to select the closest edge/corner to the mouse click position.
