Finding vertices of the outer contour of intersecting polygons I have a bunch of intersecting convex polygons, I want to find vertices of the outer contour of all those polygons. An individual polygon is not self-intersecting.

Could you please tell What could be a generic way of achieving this? Is there an API to do this?

PS: I'm developing a CAD drawing generator using .netdxf and C#.

Below is a simple example
Sounds like you’re looking for a way to do a Boolean union operation. There’s a couple of algorithms linked from that article that should do the trick.