Since I am not getting any replies about subroutines, I did restructure again so that I can copy DC and make a few changes to produce a component that maintains distances. The example would work for a garage door ( using ASIN & ACOS for angles ). The calculations were adapted from http://local.wasp.uwa.edu.au/~pbourke/geometry/sphereline/ http://local.wasp.uwa.edu.au/~pbourke/geometry/2circle/ There are some weird bugs in sketchup when using large numbers, in addition to the SQRT problems. skyfish trackroller II.skp

Its fixed. My error. I hate when that happens. For those of you playing at home, I have attached the fixed version. On to the hairy part skyfish