Clipper for Grasshopper 0.1 is released

Hi all,

Yesterday I've wrapped up the first release for clipper for grasshopper.

Clipper is a 2D polygon Clipper offering polygon boolean operations (clipping): Intersection, Join, Difference, XOR. Offsets for polygons and Minkowski Sum and Differences.

The good stuff:

it accepts all types of polygons including self-intersecting ones
it supports multiple polygon filling rules (EvenOdd, NonZero)
it's very fast relative to the RhinoCommon counterparts
it also performs line and polygon offsetting
it's numerically robust
it's free to use in both freeware and commercial applications
it's open source
it's native .NET

What it does not do

Curves, Splines, Arcs need to be converted to polygons
No support for splines, nurbs
Only in-plane operations are supported (all geometry will be projected onto it's 2d space)
Circular fillets are represented as polygons

Can be downloaded from http://www.food4rhino.com/project/clipper

Source code is available at https://github.com/arendvw/clipper

Replies to This Discussion

Permalink Reply by Daniel Fink on July 10, 2014 at 8:30am

I've been looking for Minkowski Sum & complex polygon offsetting implementation! This is fantastic! Thank you!

Permalink Reply by Arend on July 10, 2014 at 9:43am

The implementation is still quite basic, let me know if you need any help. The minkowski difference can also do quite cool tricks. (the line described by the closest point of the 0,0,0 point determines how far object A is away from object B. (See the examples on github).

Permalink Reply by Lieuwe on September 18, 2014 at 4:46pm

Hi Arend!

First of, great plugin, works great so far!

Yet I've ran into a problem. The offset seems to be working fine, yet when you zoom in there are parts which are sticking out (corners of other lines I suppose).

Can I prevent that from happening ? So I get 'clean' corners?

I tried playing around with the tolerance, but higher tolerance seems to give me worse results then with a small tolerance like 0,001.

Hope you can help out in one way or another ;)

Attachments:

voronoi facade pattern problem.gh, 18 KB

Permalink Reply by Arend on September 19, 2014 at 11:15am

Hi Lieuwe,

You're using open curves, so each curve will have a "open fillet" applied. If you set this input value to 2, it will use the "butt" value, so each line won't be extended by the offset distance.

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