CGAL users discussion list

["Riedel, Torge" <>]

Hi CGAL-list,

 

in addition to my already done evaluation of CGAL there was a request to check and test for three more features:

 

1. Offset

Given a mesh (open / closed surface) we want to create a new mesh by offsetting each triangle of the mesh in its normal direction by a given value and then combining all the new triangles to a new mesh by (re)fitting their sizes (and maybe adding / remove triangles). I searched CGAL online documentation, but without luck to find something.

 

2. Swept-Volume

Given a mesh (open / closed surface) we want to create a new (closed) mesh by moving the mesh along a given path (I think approximated by a polygon).

 

I have found CGAL::Polygon_mesh_processing::extrude_mesh, but it is limited (documentation) to open surface meshes. If it would supported closed meshes too, I could use the signature with a Vector_3 on each line of the polygon one after another.

 

3. Smoothing

Given a mesh (open surface) we want to create a new mesh by smoothing it. Starting with a simple example: Given a maximum angle between two triangles (the normals), sharp angles between two triangles will be smoothened by decreasing the angle while keeping the edge. Neighbour triangles will be modified too.

 

I have not found a promising method yet.

 

Hope my explanation was somewhat clear, but I can give more information or paint pictures. It would be great if someone can help to go further.

 

Thank you and best regards
Torge

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