random attraction points on base srf pulls top srf down to create pillars

I've been struggling for a week with the same problem, and now I turn to you, fellow grasshopper-users!

Picture 1: I have these surfaces, there is a loft (the outer shell) over some arcs, that is offsetted (to create an inner ceiling), and on the ground i lofted the curves also(floor).

I would like to create a random pattern of points on the ground-surface that pulls the off-setted, "inner roof" towards the ground, creating pillars resembeling to the bird skull section (picture 3). Preferrably in several "floors" if possible.. (like in the picture)

If anyone has a better suggestion on how to create the bird-skull structure inside my shapes, you are very welcome to say so!

I have only worked with grasshopper for a couple of weeks, so if you explain something, please do it step, by step, so that I can follow:)

Peace, thank you and keep up the good work everybody!!

Replies to This Discussion

Permalink Reply by Pieter Segeren on December 15, 2011 at 2:21pm

Hi Sophia, here's a way to create the random pts on your surface, for the structure I 'd suggest you do a search for 'mesh relaxation'. Good luck!

Permalink Reply by Sophia Keivanlo on December 15, 2011 at 3:48pm

Thank you so much Pieter!

The picture is really helpful:)

I'm following your instructions now, but I can't find the icon with NMP, is it something I have to download?

Permalink Reply by Pieter Segeren on December 15, 2011 at 11:33pm

It's in the vectors tab, I think it was introduced in GH 8.00061. Just get the latest version I'd say.

Permalink Reply by Michael Pryor on December 15, 2011 at 2:49pm

Following what Pieter said, I always remember this post. http://www.grasshopper3d.com/forum/topics/how-to-create-nodesbone. This typically requires Kangaroo. These structures are as Pieter says called minimal surface but are also referred to commonly as bone structures.

Permalink Reply by Sophia Keivanlo on December 15, 2011 at 3:50pm

I will definetely read that discussion-thread, thank you so much Michael:)

Permalink Reply by Sophia Keivanlo on December 16, 2011 at 5:57am

Hi! I got stuck.. Why do I get this result?

The points appears only on the edge of the surface and on 0,0,0, when they should be randomly applied all over the surface.

I have tried to connect xy-plane to m on PtToNum, but it only inherites the x, shouldn't it say xy? I have tried other planes also, but can't make it work..

Best wishes to all/s

Permalink Reply by Chris Tietjen on December 16, 2011 at 6:58am

Here's a random set of points.

Permalink Reply by Chris Tietjen on December 16, 2011 at 7:02am

Here's the definition.

Attachments:

RandomPtsOnSurface.gh, 9 KB

Permalink Reply by Sophia Keivanlo on December 16, 2011 at 7:04am

Thank you Cris! I will think about that in the future!

Permalink Reply by Chris Tietjen on December 16, 2011 at 7:10am

Also on Pieter's method right click on the M input of the NumbersToPts component and choose the XY option. Don't use the vector components as inputs.

...And I just realized that you don't need the flatten components in the definition that I posted. I was trying several different ideas and forgot to remove their remnants.

Permalink Reply by Hannes Löschke on December 17, 2011 at 3:16pm