mesh_manifold_harmonics.h

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#ifndef GEOGRAM_MESH_MESH_MANIFOLD_HARMONICS
#define GEOGRAM_MESH_MESH_MANIFOLD_HARMONICS
 
#include <geogram/basic/common.h>
#include <geogram/basic/numeric.h>
#include <geogram/basic/memory.h>
 
namespace GEO {
    class Mesh;
 
    enum LaplaceBeltramiDiscretization {
        COMBINATORIAL,    // 1.0 everywhere
        UNIFORM,          // combinatorial divided by node degree
        FEM_P1,           // Linear finite elements
        FEM_P1_LUMPED     // Linear finite elements with lumped mass matrix
    };
 
    void GEOGRAM_API mesh_compute_manifold_harmonics(
        Mesh& M, index_t nb_eigens,
        LaplaceBeltramiDiscretization discretization,
        const std::string& attribute_name = "eigen",
        double shift = 0.0,
        bool print_spectrum = false
    );
 
 
    typedef void (*ManifoldHarmonicsCallback)(
        index_t eigen_index,
        double eigen_val, const double* eigen_vector,
        void* client_data
    );
 
    void GEOGRAM_API mesh_compute_manifold_harmonics_by_bands(
        Mesh& M, index_t nb_eigens,
        LaplaceBeltramiDiscretization discretization,
        ManifoldHarmonicsCallback callback,
        index_t nb_eigens_per_band = 30,
        double initial_shift = 0.0,
        void* client_data = nullptr
    );
 
}
 
#endif