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answered 2013-03-07 00:50:02 +0100
nevermind.
Q=arrow3d((0,1,-1), (1,2,0), color="green") P=arrow3d((0,1,0), (2,3,1), color="red") show(P+Q, figsize=5)
works. from: http://sagemath.wikispaces.com/line3d