Does Geogram have a way to find and remove equal and opposite facets?

[tksuoran]

Suppose I stack two cubes on top of each other. The top facet of the bottom cube is equal but opposite to the bottom facet of the top cube. I have use case where I want find and remove all such facets in Mesh. I do have my own code for this, but I am curious to know if Geogram already has this functionality, as I could drop my code for this in that case. Thanks!

[BrunoLevy]

MeshSurfaceIntersection (used to implement CSG and boolean operations) does that (in addition, if there are intersections, they will be resolved), it can be used as follows:

        #include <geogram/mesh/mesh_surface_intersection.h>        
        MeshSurfaceIntersection intersection(M);
        intersection.set_delaunay(true);
        intersection.set_detect_intersecting_neighbors(true);
        intersection.set_radial_sort(true);
        intersection.intersect();
        intersection.remove_internal_shells();
        intersection.simplify_coplanar_facets(coplanar_angle_tolerance); // optional

See also:

• this discussion
• this page
• this page
• this technical article

[tksuoran]

Thanks, I got it working :)