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Description :
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Tapered helix sweep. Colour the edges of a triangle model,
scale it by 0.5 (-S 0.5),
progressively translate it 2 to 1 units on the x-axis (-T '2*(1-FRAC),0,0'),
progressively translate it 5 to 0 units on the y-axis (-T 0,5*FRAC,0),
progressively rotate it 10 turns around the y-axis (-R 0,10*ANG,0).
Note that maths expressions using special characters lie '(' may need the
option argument to be surrounded by quotes, or escaped in some other way.
View this model with the command
off_color -e U pol3 | sweep_edges -n 200 -S 0.5 -T '2*(1-FRAC),0,0' -T 0,5*FRAC,0 -R 0,10*ANG,0 | antiview -t no_tri -x e
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