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  1. Wanting to rotate an arbitrary 3D point, cords X,Y,Z relative to XYZ location 0,0,0 in a 3D system. But all I find is Math/Geometry/3D Rot (direct and euler) which both take ARRAYS for their input, and a 3X3 ARRAY for it's command. I do not grok this concept at all. What's going on? How can I use it instead to deal with a single point (anywhere) relative to the system origin? Problem relates to a calculator I have built for the design of log-periodic antennas. The antenna consists of wires, paired as XYZ_from and XYZ_to with also a subunit 'segments' for each, thus a 4xN array of (X,Y,Z,Segs) of arbitrary length. First wire is always on the origin. So I'm wanting to perform pitch/roll/yaw on this antenna from point 0,0,0. But do it by running my coordinates X,Y,Z for each wire-end, one set at a time, through a transformation filter. And the whole 3x3 matrix makes no sense to me. Sorry, I'm 30 years out of college. This is a hobby project for a calculator I'll give away free. Can someone clue me in?
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