to ignore some input in a list

Dear,

I'm drawing a line and I divided it in several segments using "divide curve".

Now I would like to place a circle on each points but the first and the last points (start and end of the line). How is that possible?

Is it possible to exclude any other point (like the mid one, for example) in such a way no circle is going to be placed there?

Thanks a lot!

Tags: division

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Permalink Reply by Danny Boyes on October 11, 2010 at 7:55am

"There are many ways to skin a cat."

My favourite method for this particular case is to use the shift list component twice once with a 1 and then with a -1, provided you don't wrap the list it will knock the first item off the beginning and then the last one of the end.

Other methods could include using the List item component and provide a series that starts at 1 and is N-2 in length, or Sub List component where you supply a domain from 1 to N-2.

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Permalink Reply by Roberto Maffei on October 11, 2010 at 8:38am

thanks a lot! the cat is skinned now!

now i have the circles and i've done a loft btw them.
anyway, do you have any idea why the command gedesic doesn't work on loft?

here is my file too (just need 2 points on a plane to run it)

Thanks a lot for your help Danny

Attachments:

arch elements parametric.ghx, 429 KB

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Permalink Reply by Danny Boyes on October 11, 2010 at 8:46am

Your loft options are causing a polysurface to be made and geodesic is expecting a surface. Un-plug the options and see what happens.

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Permalink Reply by Roberto Maffei on October 11, 2010 at 9:31am

ah great! so simple!

thanks a lot Danny.

as you saw in the file, i'm working on membranes and pneumatic structures. Do you know any tool for generating cutting pattern of tensile structure? is there any possibility in grasshopper?

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Permalink Reply by Danny Boyes on October 11, 2010 at 9:39am

Outside my area but you could start here
http://www.grasshopper3d.com/forum/topics/foldingunfolding-developa...
or use the grasshopper search facility at the right hand side --> and look for developable surfaces.