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Glut Coordinate System Used in keyboard and mouse callbacks x y w h [window]
![Glut Coordinate System Used in keyboard and mouse callbacks x y w h [window]](http://images.slideplayer.com./25/7765348/slides/slide_1.jpg "Glut Coordinate System Used in keyboard and mouse callbacks x y w h [window]")
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Fall 2013 revised2 Recall OpenGL Rendering Pipeline stages of vertex transformation
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OpenGL NDC (normalized device coordinate) x y z [-1,1] 2 × [0,1] depth range Near (0) Far (1) Note: this is a left-hand coordinate system!
![OpenGL NDC (normalized device coordinate) x y z [-1,1] 2 × [0,1] depth range Near (0) Far (1) Note: this is a left-hand coordinate system!](http://images.slideplayer.com./25/7765348/slides/slide_3.jpg "OpenGL NDC (normalized device coordinate) x y z [-1,1] 2 × [0,1] depth range Near (0) Far (1) Note: this is a left-hand coordinate system!")
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Fall 2013 revised4 Recall OpenGL Rendering Pipeline stages of vertex transformation
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OpenGL Window Coordinates x y z [0,1] 2 Near (0) Far (1)
![OpenGL Window Coordinates x y z [0,1] 2 Near (0) Far (1)](http://images.slideplayer.com./25/7765348/slides/slide_5.jpg "OpenGL Window Coordinates x y z [0,1] 2 Near (0) Far (1)")
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Use Mouse to Pick 2D World x y xminxmax (mx, my) (x, y) w x Keep all terms positive in the formula
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Use Mouse to Pick 2D World x y ymin ymax (mx, my) (x, y) h Length ratio: take positive values y
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Summary
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