detect mouse position on 2D mesh [keystoners unite]

    Mar 17 2012 | 9:10 pm
    im building (yet-another) projection mapping patch. based on h.jit.homography ( (thanks again hons)
    now to make it nicer: i would like to draw masks on the active skewed plane (currently i use jit.lcd alpha-glued on the mesh texture) but i need to find the projected(?) position of mouse on relevant mesh to make it more intuitive.
    here ya go