i knocked this together in the hope it might illustrate the question a bit better. I am trying to find 'a'.
http://i3.photobucket.com/albums/y60/con20or/image-1.png
Hello all, i wonder if you can help me with a problem I am having.
I have a disc and three planes (representing a road, building and roof). For this problem, the disc can be considered a plane.
http://i3.photobucket.com/albums/y60/con20or/Fig1.png
I know the orientation of each of the...