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208 jrf 1 
#ifndef __BBOX_H__
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#define __BBOX_H__
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#include "CGLA/Vec3f.h"
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#include "Ray.h"
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290 jrf 8 
namespace Geometry
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{
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  struct ISectTri
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  {
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    CGLA::Vec3f point0;
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    CGLA::Vec3f point1;
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    CGLA::Vec3f point2;
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    CGLA::Vec3f edge0; // Optimization
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    CGLA::Vec3f edge1; // Optimization
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    unsigned int mesh_id;
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    unsigned int tri_id; // pad to 48 bytes for cache alignment purposes
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  };
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  struct TriAccel
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  {
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    // first 16 byte half cache line
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    // plane:
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    double n_u;  //!< == normal.u / normal.k
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    double n_v;  //!< == normal.v / normal.k
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    double n_d;  //!< constant of plane equation
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    int k;       // projection dimension
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    // second 16 byte half cache line
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    // line equation for line ac
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    double b_nu;
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    double b_nv;
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    double b_d;
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    unsigned int mesh_id;
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    // third 16 byte half cache line
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    // line equation for line ab
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    double c_nu;
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    double c_nv;
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    double c_d;
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    unsigned int tri_id; // pad to 48 bytes for cache alignment purposes
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  };
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  struct BBox
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  {
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    CGLA::Vec3f min_corner;
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    CGLA::Vec3f max_corner;
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290 jrf 52 
    void intersect_min_max(Ray &ray, double &t_min, double &t_max) const ;
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    bool intersect(Ray &ray);
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    bool ray_triangle(CGLA::Vec3f &ray_start, CGLA::Vec3f &ray_end, ISectTri &tri);
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    bool intersect_edge_box(CGLA::Vec3f &ray_start, CGLA::Vec3f &ray_end);
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    bool intersect_triangle(ISectTri &tri);
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    bool in_interval(double min_limit, double test_value, double max_limit);
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    void compute_bbox(std::vector<ISectTri> &isectmesh);
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    bool intersect_triangle_left(ISectTri &tri, double plane, int axis);
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    bool intersect_triangle_right(ISectTri &tri, double plane, int axis);
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    double area();
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  };
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}
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#endif