I've lloked througn web, but all the suggestions are too hard for me to understand *) just wanted to ask whether there is n easy way to calculate angle between planes in GR. i found one thread, nut its no explanation there http://groups.google.com/group/grasshopper3d/browse_thread/thread/91885613f89014f0/648ad093e0843761?lnk=gst&q=plane+definition#648ad093e0843761
thnx in advance
