MREdgeLengthMesh.h

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#pragma once
 
#include "MRMeshTopology.h"
#include <optional>
 
namespace MR
{
 

struct [[nodiscard]] EdgeLengthMesh
{
    MeshTopology topology;
    UndirectedEdgeScalars edgeLengths;

    [[nodiscard]] MRMESH_API static EdgeLengthMesh fromMesh( const Mesh& mesh );

    [[nodiscard]] MRMESH_API float leftCotan( EdgeId e ) const;

    [[nodiscard]] float cotan( UndirectedEdgeId ue ) const { EdgeId e{ ue }; return leftCotan( e ) + leftCotan( e.sym() ); }

    [[nodiscard]] bool isDelone( UndirectedEdgeId ue, float threshold = 0 ) const { return cotan( ue ) >= threshold; }

    [[nodiscard]] MRMESH_API std::optional<float> edgeLengthAfterFlip( EdgeId e ) const;

    MRMESH_API bool flipEdge( EdgeId e );
};
 
}