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["????" <>]

I'm developing a ceiling design feature using Three.js.

1. First, I draw some lines in Three.js.
2. Then, I use CGAL Arrangement to obtain all the enclosed regions and their corresponding edges.
3. Users then set a thickness or extrusion value for each of these enclosed regions.
4. Next, users can perform operations like:
   • Dragging endpoints of lines,
   • Dragging entire lines,
   • Deleting lines,
   • Cutting lines, etc., to modify the design.
5. During this user modification process, I want to preserve the thickness/extrusion values of the enclosed regions as much as possible.

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??????: "cgal-discuss" <>;

????????: 2025??6??17??(??????) ????5:52

??????: "cgal-discuss"<>;

????: Re: [cgal-discuss] how to Moving edges in CGAL Arrangement

You can remove an edge and re-insert the curve.

If you are absolutely sure that the topology does not change as a result of changing the geometry (e.g., coordinates of a point, you do that as well), you can do that as well.

What is "extrusion_value" ?

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On Tue, 17 Jun 2025 at 10:02, "???1?7?1?7" <> wrote:

hello,   How can I modify geometry of existing edges in Arrangement_2 while preserving custom face attributes (like extrusion_value)?

• Key operation: Move edge geometry (change vertex positions)
• Critical: Maintain face/extrusion attributes after moving edges

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