! Determination of frustum parameters !

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Holger Krumm (hok++at++hni.uni-paderborn.de)
Mon, 07 Apr 1997 10:38:38 +0200

Dear performers,

I have a problem with the determination of parameters for my viewing
frustum.
What I want to do is the following:
At position w is a rectangle-shaped polygon, at position p the
viewpoint.

                    --------------- t = polygon with height h
                    \ \ and width w
                      \ |
                        \ \
                          \ |
                            \ \
                              \ |
                                \ \
                                  \ |
                                    \ \
                                      \|
                                      (+) p = viewing position

I want to modify parameters of the viewing frustum (left, right, bottom,
top, fov) so that the polygon is entirely shown in my window. So I want
a function with which I can determine the frustum parameters with
knowledge
of 2D screen coordinates and 3D object coordinates.

If this is a simple question I am sorry to have bothered you but I
browsed
through the manuals and haven't found the right answer.

Thanks for any pointer,

        Holger

PS: Attached is a small pdf-file showing the upper figure in a
    better way ;-)

-- 


------------------


  *     *      *    
  **   **     **    Holger Krumm
  *** ***   ****    Student of Computer Science
  *******  *****    EMail: hok++at++hni.uni-paderborn.de
  *** ***   ****    
  **   **     **    "Very funny, Scotty! And now my clothes..."
  *     *      *

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