[JAVA3D] get position in 3D World from mouse cursor

[Shinji Tanaka]

I have a 3D environment, and I am looking at it from the top. I need to get the x and z positions of the canvas 3D from the mouse cursor . I don't need the Y position because I am looking at it from the top as I mentioned before. I would rather not use the picking APIs to get these numbers because of the over head. I am still reading the picking API source code, because there must be a way to convert the position of the mouse cursor on the image plate to the corresponding canvas 3D position. Does anyone know anything on this matter that could help me? Thank you very much, Shinji Tanaka