# Scissor Structure

Hi folks.
what I want to do is to create a linear series of scissor structure. as the picture below:
there are a couple of problems I came acrossed with:

1. the endpoints splits If the whole structure moves in a direction
2. the lines in my script does not become compatc so that the scissor structure completly does its task.
3. I think I need a cluster for lines shape and pinpoints on them in order to hold the structure toghether
can you help me please? the length of each line is 0.417
1 Like

My problem isnāt that complicated and also not a curved structure, just a simple linear one direction pantograph which Iām going to attach to a pneumatic arm.

In that case keep it simple - no need for simulation
simplescissor.gh (7.7 KB)

4 Likes

For sure! Yours is much simpler than mine.

scissors_2020Aug30a.gh (20.4 KB)

Thank you Daniel
in origamiās simulation is needed, Iām looking forward to focus on learning kangaroo in order to simulate such structures.

Yes, when the problem is simple enough that a simple geometric solution is possible I think itās usually better to use that, but if this is a test for something more complex where such geometric approaches arenāt obvious then you can simulate it like this:
scissor_kangaroo.gh (12.9 KB)
The key is the ārodā goal - each arm of the scissor is a polyline with 2 segments, and this goal keeps the 2 segments in a straight line.

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Fascinating, yet bizarre. Having to supply the two polylines isnāt quite as convenient and parametric as the āsimple geometric solutionā, though GH code to create those segments could be added, of course.