Simplify Network (Reduce, Rebuild, Smooth), Medial Axis, Image Tracing

[Pejo]

Hey everyone,
i am looking for a method to transfer a picture of a Network to a clean vectorized Network of Nodes and simple lines connecting this nodes to creat a base i could continue working on with e.g. Heteroptera or Sandbox.
After trying out Rooster I got showen a thinning algorithem ( image - Zhang-Suen thinning algorithm C# - Stack Overflow ) which produces like a medial axis trough the black part of the picture but in a realy messy way:

after trying countless ideas to reduce this polylines to simple line between the nodes i found a script which somehow manged to reduce this complex polylines but misses out kinks (Red line)
I realy dont know what i could try anymore and hope that you could help me out converting this complex polyline to a simple network of lines or an other method of image tracing for a clean network result
Polyline network to line Network.gh (60.0 KB)

[laurent_delrieu]

I found a way not too bad, for my applications (3d printing) I choose to prefer arcs over lines, but it could be possible to make a script with just arcs.

Explained here

We need to talk about Offset

Hello @Petras_Vestartas Yes it is possible. You can do that Use Clipper Make a small script that takes a polyline and extract arc or line. I did that, and if tolerance for converting polyline to arcs and lines is more than 2 or 3 it works : [image] @visose did show a way to do it, but it is a bit too simple. See Arc Welder

Strangely the command “convert” in Rhino doesn’t output good result for zig zag polylines !

Script for convert curve to arcs and lines

Hi Willem, Would you mind sharing your script. I was just about to write my own, but thought I should make a search here before I put my mind to it. Cheers

Wish: convert curve to arcs & polylines

Hi, I wish for a function to convert a curve to arc and line segments. Similar to the _Convert command with the option Output=Arcs. Right now I think there’s only ToPolyline available from RhinoCommon. Or do I miss a way to convert nurbs curves to arcs and lines? Thanks, Jess

[DanielPiker]

Here’s a little script for this
Polyline network to line Network _ script.gh (54.5 KB)

This is the same thing as posted here, just without the smoothing part.

Shortest walk curves smoothing

Here with joining the segments into nurbs curves in the script so they can be offset. [image] graphsmooth_nurbs_offset.gh (17.6 KB)

edit - if you’re saying you want to simplify and clean up the graph but keep the large corners, then you can combine with reduce, like this
Polyline network to line Network _ script_corners.gh (57.7 KB)