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Simple Grasshopper Sketch


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i'm new in GH and I'm trying to undeerstand how to do a simple sketch analysing connections between 4 lines.

I try to explain my question:


- I need to create 4 vertical lines (like the edges of a rectangle)

- Divide the rectangle into X floors (so i have 4 points for each floor)

- Create a polyline that start from one point at the base and randomly grow up along this series of points without passing two times on the same point (like a ramp)


I attach a file to better understand.



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