An algorithm for inflating/deflating (offsetting, buffering) polygons

Question

How would I "inflate" a polygon? That is, I want to do something similar to this:

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Answer 1

There are a couple of libraries one can use (Also usable for 3D data sets).

1. https://github.com/otherlab/openmesh
2. https://github.com/alecjacobson/nested_cages
3. http://homepage.tudelft.nl/h05k3/Projects/MeshThickeningProj.htm

One can also find corresponding publications for these libraries to understand the algorithms in more detail.

The last one has the least dependencies and is self-contained and can read in .obj files.

Best wishes, Stephan