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when toggle format what by license comment
Mar 11, 2016 at 22:18 history edited Makcheese CC BY-SA 3.0
added 177 characters in body
Mar 11, 2016 at 22:08 comment added Pieter Geerkens The direction vectors must be normalized first of course - obvious to you and I but perhaps not to OP.
Dec 12, 2015 at 14:08 history answered Makcheese CC BY-SA 3.0