Extracting points from a list

Replies to This Discussion

Permalink Reply by David Rutten on October 5, 2017 at 11:35am

Two ways that make sense:

1. Measure the distance from each point to the World XY plane. If the absolute distance is less than some tolerance (say 1e-6) then the point is 'at' zero.
2. Extract the z coordinate of each point and compare its absolute value to a tolerance.

Two is more straightforward, one is more flexible. Do be sure to use Less Than and Absolute instead of Equals. You're dealing with floating point values here so if these numbers are the result of some computation, they are likely to not be exactly zero, but rather something like 0.000000000000000008

Permalink Reply by Xavier on October 6, 2017 at 5:39am

Hi David,

Thank you so much for your advice. I can understand it now. 

Permalink Reply by Daniel González Abalde on October 5, 2017 at 11:38am

Or use [Equality] instead of [Similarity] if you know that there are points with exactly z=0.

Permalink Reply by Xavier on October 6, 2017 at 5:40am

Hi Daniel,

Thank you so much for the grasshopper definition. I appreciate it very much.