how to select the points inside of certain boundary

Dear all,

Sorry for the simple question.

As my first project in Grasshopper, I want to selects the points in the circle area. My logic right now is i should find a way out to export the value of the points and use the curve postion to limit each value of the points. Am i on the right tract now or i should find anthother method.

Thanks all of your help in advance. I need the answer as soon as possible.

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Replies to This Discussion

Permalink Reply by Danny Boyes on January 16, 2014 at 3:59am

There is a component for this on the Curve Tab > Analysis Panel (drop down list)

Permalink Reply by Danny Boyes on January 16, 2014 at 4:02am

If you where looking to do it by logic there is the raytrace method.

If you have an odd number of intersects with a line starting at your chosen point with the boundary of the circle it is inside and if it is even it is outside (remember 0 is an even number)

Permalink Reply by Bowen Tan on January 17, 2014 at 5:44am

Thanx mate, it works. That is exactly what i am looking for, you are awesome!!!!

Permalink Reply by Julian Raxworthy on September 6, 2017 at 7:56am

I know this is a while back but I think I am trying to do the opposite..

I want to select the original curves that have the highlighted points on them. In other words I want to select the curve that has that corner for a subsequent extrusion rule (eg. corners at a different height to the rest..

Thanks for your help!

Permalink Reply by Joseph Oster on September 6, 2017 at 8:06am

Read this first! How to get help on this forum.

Permalink Reply by Chapulin Colorado on September 6, 2017 at 1:03pm

i think with sanbox you could do it like this:

Permalink Reply by Julian Raxworthy on September 7, 2017 at 4:43am

Thanks so much: that looks great, exactly the function i am looking for. Doesn't look however like it runs for Grasshopper in RhinoWIP: I am a mac user. But thanks again for your generosity of answering!

Permalink Reply by Chapulin Colorado on September 7, 2017 at 6:55am

Hi,

i think depending on your input Curves you could do it also like this:

Permalink Reply by Pieter Segeren on September 8, 2017 at 7:33am

You could use [Region Union](Edit: Oh, the flatten wasn't needed here...)

Permalink Reply by asem on December 6, 2019 at 12:57pm

Hello

I project a circle on the dome and change the dome surface to mesh with lots of mesh points. I want to find points into the projected circle on the dome, unfortunately, your manner is not working. Do you have another idea about it?

Best

Asem

Permalink Reply by pikachu on February 6, 2020 at 8:52pm