I'm doing this :

box {<-10,0,-7>,<10,7,7>
     matrix <  1, -.5, 0,
               0,  1,  0,
               0,  0,  1,
               0,  0,  0 >
}

..which shears the box so the top is no more parallel to the ground 
plane.  However, I have a problem determining at which angle it is now !
I would have tought that this gives a 30 degrees angle (arcsinus 0.5),
but placing a 30-degrees rotated object on top of the box proves it
wrong !  How do I calculate the exact angle ?

Fabien.

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