Geometry

My previous polygon clipping tutorial dove into the Greiner-Hormann clipping algorithm. Unfortunately, this algorithm fails at common cases… so let’s revist the problem and try again.

The F. Martinez 2008 algorithm handles coincident edges (unlike Greiner-Hormann), but it still has some minor goofiness. Let’s solve this problem once and for all.

Read More

Polygon clipping is an interesting problem: how do you intersect, union, or diff two polygons?

My first attempt was a failure:

Polygon Clipping - Part 1 (Greiner-Hormann)

So I researched and developed another algorithm, which handles every case:

Polygon Clipping - Part 2 (Modified F. Martinez 2008)

Read More