mesh_frame_field.h

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#ifndef GEOGRAM_MESH_MESH_FRAME_FIELD
#define GEOGRAM_MESH_MESH_FRAME_FIELD
 
#include <geogram/basic/common.h>
#include <geogram/basic/geometry.h>
#include <geogram/points/nn_search.h>
 
namespace GEO {
 
    class Mesh;
 
    class GEOGRAM_API FrameField {
    public:
    FrameField() : use_NN_(true) {
    }
 
    void set_use_spatial_search(bool x) {
        use_NN_ = x;
    }
 
    bool load(
        const Mesh& M, bool volumetric, const std::string& filename
    );
 
 
    void create_from_surface_mesh(
        const Mesh& M, bool volumetric, double sharp_angle_threshold=45.0
    );
 
    index_t get_nearest_frame_index(const double* p) const {
        geo_assert(use_NN_);
        return NN_->get_nearest_neighbor(p);
    }
 
    void get_nearest_frame(const double* p, double* f) const {
        geo_assert(use_NN_);
        index_t fi = get_nearest_frame_index(p);
        for(index_t c = 0; c < 9; ++c) {
            f[c] = frames_[fi * 9 + c];
        }
    }
 
    const vector<double>& frames() const {
        return frames_;
    }
 
    /*
     * \brief Scales one of the vectors of a frame.
     * \details On exit, the norm of the vector nearest to \p N in
     *   \p frame has a norm equal to \p s.
     * \param[in,out] frame the frame, as an array of 9 doubles
     * \param[in] N the vector to be scaled (retrieved in the frame)
     * \param[in] s scaling factor
     */
    static void scale_frame_vector(double* frame, const vec3& N, double s);
 
    static void fix_frame(double* frame, const vec3& N);
 
    private:
    NearestNeighborSearch_var NN_;
    vector<double> frames_;
    vector<double> centers_;
    bool use_NN_;
    };
 
 
}
 
#endif