Hi, I wasn't able to find my problem. So I did some debug stuff. I killed ALL camera justification and made only one rotation and one scale. I did the same in den display method (all stuff only on a projection matrix). I saw my game board from above and everything works fine. (_,maybeHitRecords)<- getHitRecords 128 $ withName (Name 0) $ do preservingMatrix $ do loadIdentity pickMatrix (fromIntegral winx, fromIntegral (500-winy)) (5, 5) vp rotate 90 $ Vector3 1 0 (0::GLfloat) scale 0.3 0.3 (0.3::GLfloat) drawBoardSelection flush So my problem is: in the display func I set the gluperspective on the projection matrix and the gluLookAt, board transformations, ... on the modelview matrix. Isn't it wrong to make all this things on one projectionmatrix when I make the hitdetection?? I'm very sure that my hitrecord method has not the same view of my board like I have. Thats probably the reason why I have hits where I shouldn't have them. In the RedBook they did it on one projection matrix and I works. The opengl guys really know what they do, but could it be that I have to make it a bit different? I will be very gratefull for any good suggestions. Best regards Patrick