I've been using MoI 3d for years now to design and build projects for woodworking. It makes the math so much easier! My question to the forum has to do with determining compound angles. I know that if I can figure out the angle between two planes, I can then figure at what angle to set the mitre and bevel of the saw I am using. Would anyone have a simple method to determine the angle between to planes when neither plane lies on the orthographic planes?