i'm having difficulty implementing click and drag using the GLUT mouse functions. glutMotionFunc does the dragging part, but there doesnt seem a way to monitor which button initiates the call. glutMouseFunc gives the button, but i cant get it to do the dragging (it moves in one jump when you release the button). i'm trying to make it so dragging the mouse moves the camera position. i want dragging with the left button clicked to rotate the camera about the origin, and dragging with the right button clicked to zoom in/out.

yep that does the trick, thanks.