Grasshopper

algorithmic modeling for Rhino

Count the distance between Trues in a list?

Hi so I'm trying to make this flower and the problem is that it is made through a formula so when I make a polyline it intersects on itself.

It intersects on the origin so what I wanted to do is test the points on whether they are on the origin or not, and then partition the list based on the the distance between the Trues

What that would give me is a partitioned list of points for each pedal. Which I would then try to make a surface from.

Anyone know how I can do so?

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Permalink Reply by Danny Boyes on December 3, 2013 at 6:21am

Hi JS

You can use [Member Index] to identify where in the list the Origin occurs and then do a running subtraction of two shifted lists (S=1) and (S=-1) where the Wrapping is false to get the partition sizes.

Permalink Reply by Danny Boyes on December 3, 2013 at 6:40am

Edit: Sorry just to clarify in the example above I have the Expression is S=-S and both values are 1. 

Permalink Reply by JS on December 3, 2013 at 7:11pm

Thank you very much Danny! Even if I knew about member index (which I didn't) I don't think I would have ever thought of shifting the list like that.

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