Grasshopper

algorithmic modeling for Rhino

Hi guys,

I'm scratching my head over this one.

I am taking out sections of a 3D point grid but some points are excluded. Check the picture with result and definition.

Could this be a tolerance issue? Weird because I am taking the selection list directly from the points' coordinates.

Hopefully a new set of eyes can shed some light.

All the best.

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Maybe if you post your definition as a grasshopper file...

Without being able to examine your code, there is no way to tell from the image if the data is as implied.  It truly baffles me that so many expect so much from so little (screen shots or text descriptions instead of code/data!)?

GH definition

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It seems to be a tolerance issue, but you can solve it by explicitly declaring everything as an integer. Then it will work both with a 'member index' as 'equality'. But I have to agree, it is a little bit weird...

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It looks peculiar, especially since using 'Similar' instead of 'Equals' makes no difference!

There are anomalies in the data though:

Interesting to see that this code works with your raw data (points):

http://www.grasshopper3d.com/forum/topics/set-member-index-example-...

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Hi. Aristo.

It's one of recurrently asked question and obviously one of tolerance issue.

Please refer to "here" for a detailed explanation.

The same numbers on the panel may not be the same.

By using the formatting pattern {0:R}, you can see the number without any rounding.

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Thanks all for your tips in troubleshooting. I'll have to keep tolerances in mind when dealing with selections in the future.

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