Shortest Walk Tapered Branching Script

This is the script of Daniel Abalde's Peacock tapered offset post, here:

http://www.grasshopper3d.com/photo/the-variable-offset-component-sp...

Replies to This Discussion

Permalink Reply by Nik Willmore on May 20, 2016 at 12:07am

My instincts were all off when I was stuck using the Mac version of Rhino for a day, so Boot Camp makes sense even to me and I didn't realize, no, it's not an old school klunky emulator but a real Windows installation you have to reboot the whole machine up into. It should work so the next debugging step would be to try other CMD line program downloads as binaries or to compile yourself to test, to see if it's an obscure Tetgen issue or a general one.

Permalink Reply by insilico on May 21, 2016 at 12:16am

I see. Yes, debugging this on bootcamp would be possible. This time I am being chased by a deadline so need to shift working on laptop but it was very good study. Thank you very much, Nic.

Permalink Reply by Charline Ronzon-Jaricot on July 8, 2016 at 4:59am

Hello Nik,

I am trying to apply your grasshopper definition to the rabbit.

But it seems that something doesn't work in the Python script. I downloaded the Tetgen files and installed everything on my C: drive.

The problem seems to be line 13 :

p = subprocess.Popen("C:/Tetgen/win32/tet.dll C:/Tetgen/BunnyMeshMachineOptimized.stl" % Minimum_Tet_Volume, stdout=subprocess.PIPE, creationflags=0x08000000)

I twiked the part in bold because I could't find what the script is looking for...

Can you help me on this please ?

Cheers,

Charline

Permalink Reply by Nik Willmore on July 10, 2016 at 3:12am

I think you are using an early version of my script that required an STL file, whereas the final version I mentioned to insilico too accepts a normal Grasshopper mesh input and it creates its own temporary STL disk file for Tetgen to operate on.

Permalink Reply by Hiroki Okamoto on February 3, 2017 at 3:36am

this GH file needs plug in "mesh pipe"

Where can i get it ?

Permalink Reply by Hsin YEN WU on May 16, 2018 at 10:27am

Moderator you can not download

Permalink Reply by Nik Willmore on February 3, 2016 at 12:17am

Acropora nobilis coral.

Permalink Reply by Nik Willmore on February 4, 2016 at 4:15am

Voronoi diagram dual of the Delaunay 3D tetrahedral mesh, subjected to the same shortest path routine, first just the tree with simple mesh pipes, then points treated as curve control points with Cocoon plug-in marching cubes fixed radius(strength) metacurves:

Permalink Reply by Nik Willmore on February 4, 2016 at 7:25am

Using Tetgen to create even Delaunay 3D distribution of points inside a solid, but using the dual of it, the Voronoi diagram, affords smoother branching using shortest walks between a chosen core point and every mesh vertex. Then I smoothed the resulting polylines as well, to remove kinks.

Attachments:

Shortest Walk Tapered Cocoon C Tetgen Voronoi Mesh Bunny.gh, 99 KB

Permalink Reply by Thomas Helzle on February 4, 2016 at 1:53pm

Awesome work Nik!

I experimented with it for a while and rendered one result with Thea Render for Rhino:

Permalink Reply by Kim hauer on February 16, 2016 at 12:34pm

Hi Nik

I'm still happy with this script. I'm wonder if a 2nd growing Point could be added.

example: simple cube.stl.

1st point at the top left vertex of a cube,

2nd point at the btm right vertex of a cube.

Now let the growing begin :) Would that work?

Permalink Reply by Nik Willmore on February 18, 2016 at 8:24am

The starting points A and B are just chosen. Dividing the end points between A and B sets of existing mesh vertices is confusing. There's also medial axis to somehow consider ordering the result for more central core branches: