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mourner / delaunator-rs

Fast 2D Delaunay triangulation in Rust. A port of Delaunator.
https://docs.rs/delaunator
ISC License
207 stars 28 forks source link

Filtering out new convex hull geometry? #26

Closed emctague closed 1 year ago

emctague commented 1 year ago

Not quite an issue but there is no discussion section on this project; Is there any mechanism to filter out hull geometry that lies outside of the original concave polygon input? Simply filtering by halfedges[i] != EMPTY ends up eliminating some regular triangles too.

andreesteve commented 1 year ago

Not sure if I understand your question. What do you mean by geometry that is outside of the original input? Can you share an example input?

AFAIK, the output triangulation hull is always convex. Some points might be ignored in the triangulation if they are ~EPSILON distance to another point. Those might be inside or outside of the hull. If those are the points you are talking about, you could identify those by searching if they are part of any triangles.

mourner commented 1 year ago

No further response so closing.