Brush up on your geometry. :=) Map from a two dimensional coordinate (screen) to a 3 dimensional one (model):
(ScreenX, ScreenY, 0) --gluUnproject--> (ModelX1, ModelY1, ModelZ1) (ScreenX, ScreenY, 1) --gluUnproject--> (ModelX2, ModelY2, ModelZ2) Now you 'draw' an invisible line from (ModelX1, ModelY1, ModelZ1) to (ModelX2, ModelY2, ModelZ2) and find first intersection point of this line with a cube. This cube is the one that has been touched. I found that the gluUnproject that came with the SDK is buggy. I wrote my own: http://groups.google.com/group/android-developers/browse_frm/thread/9d2bf53e3a798cb6/c722628acdf6e2d9?lnk=gst&q=gluUnproject#c722628acdf6e2d9 (go to message #8) On Feb 24, 2:31 am, Louis Huh <avatar....@gmail.com> wrote: > I drew cubes using opengl, > > GLSurfaceView has onTouchEvent method. but I'd like to know > > what cube was touched ? > > cubes can move anywhere in the viewport... -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en