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Outline ("convex hull") of a flat object with Triangulate 3D

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I have a flat, 2D shape with a messy interior (crisscrossed lines etc) and I want to extract only its 2D outline or silhouette. The post below suggests that Triangulate 2D can do this. Which settings in Triangulate 2D do this? Also, if you have other ideas how to extract an outline from a "messy", flat 2D shape, please let me know.

Convex hull node

Edited by guache
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