mesh_reorder.h

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#ifndef GEOGRAM_MESH_MESH_REORDER
#define GEOGRAM_MESH_MESH_REORDER
 
#include <geogram/basic/common.h>
#include <geogram/basic/numeric.h>
#include <geogram/basic/memory.h>
#include <geogram/basic/geometry.h>
 
#ifndef GEOGRAM_PSM
#include <geogram/mesh/mesh.h>
#endif
 
namespace GEO {
 
 
#ifndef GEOGRAM_PSM
 
    enum MeshOrder {
        MESH_ORDER_HILBERT,
        MESH_ORDER_MORTON
    };
 
    void GEOGRAM_API mesh_reorder(
        Mesh& M, MeshOrder order = MESH_ORDER_HILBERT,
        MeshElementsFlags elements = MESH_ALL_ELEMENTS
    );
 
    void GEOGRAM_API compute_mesh_elements_spatial_order(
        const Mesh& M, MeshElementsFlags elements, vector<index_t>& permutation,
        MeshOrder order = MESH_ORDER_HILBERT
    );
 
#endif
 
    void GEOGRAM_API compute_Hilbert_order(
        index_t total_nb_vertices, const double* vertices,
        vector<index_t>& sorted_indices,
        index_t first,
        index_t last,
        index_t dimension, index_t stride = 3
    );
 
    void GEOGRAM_API compute_BRIO_order(
        index_t nb_vertices, const double* vertices,
        vector<index_t>& sorted_indices,
        index_t dimension,
        index_t stride = 3,
        index_t threshold = 64,
        double ratio = 0.125,
        vector<index_t>* levels = nullptr
    );
 
    void GEOGRAM_API Hilbert_sort_periodic(
        index_t nb_vertices, const double* vertices,
        vector<index_t>& sorted_indices,
        index_t dimension,
        index_t stride,
        vector<index_t>::iterator first,
        vector<index_t>::iterator last,
        const vec3& period
    );
 
    inline void Hilbert_sort_periodic(
        index_t nb_vertices, const double* vertices,
        vector<index_t>& sorted_indices,
        index_t dimension,
        index_t stride,
        vector<index_t>::iterator first,
        vector<index_t>::iterator last,
        double period = 1.0
    ) {
        Hilbert_sort_periodic(
            nb_vertices, vertices,
            sorted_indices,
            dimension,
            stride,
            first,
            last,
            vec3(period, period, period)
        );
    }
}
 
#endif