/*************************************************************************/ /* face3.h */ /*************************************************************************/ /* This file is part of: */ /* GODOT ENGINE */ /* http://www.godotengine.org */ /*************************************************************************/ /* Copyright (c) 2007-2015 Juan Linietsky, Ariel Manzur. */ /* */ /* Permission is hereby granted, free of charge, to any person obtaining */ /* a copy of this software and associated documentation files (the */ /* "Software"), to deal in the Software without restriction, including */ /* without limitation the rights to use, copy, modify, merge, publish, */ /* distribute, sublicense, and/or sell copies of the Software, and to */ /* permit persons to whom the Software is furnished to do so, subject to */ /* the following conditions: */ /* */ /* The above copyright notice and this permission notice shall be */ /* included in all copies or substantial portions of the Software. */ /* */ /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */ /* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */ /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/ /* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */ /* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */ /* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */ /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ /*************************************************************************/ #ifndef FACE3_H #define FACE3_H #include "vector3.h" #include "plane.h" #include "aabb.h" #include "transform.h" class Face3 { public: enum Side { SIDE_OVER, SIDE_UNDER, SIDE_SPANNING, SIDE_COPLANAR }; Vector3 vertex[3]; /** * * @param p_plane plane used to split the face * @param p_res array of at least 3 faces, amount used in functio return * @param p_is_point_over array of at least 3 booleans, determining which face is over the plane, amount used in functio return * @param _epsilon constant used for numerical error rounding, to add "thickness" to the plane (so coplanar points can happen) * @return amount of faces generated by the split, either 0 (means no split possible), 2 or 3 */ int split_by_plane(const Plane& p_plane,Face3 *p_res,bool *p_is_point_over) const; Plane get_plane(ClockDirection p_dir=CLOCKWISE) const; Vector3 get_random_point_inside() const; Side get_side_of(const Face3& p_face,ClockDirection p_clock_dir=CLOCKWISE) const; bool is_degenerate() const; real_t get_area() const; Vector3 get_median_point() const; Vector3 get_closest_point_to(const Vector3& p_point) const; bool intersects_ray(const Vector3& p_from,const Vector3& p_dir,Vector3 * p_intersection=0) const; bool intersects_segment(const Vector3& p_from,const Vector3& p_dir,Vector3 * p_intersection=0) const; ClockDirection get_clock_dir() const; ///< todo, test if this is returning the proper clockwisity void get_support(const Vector3& p_normal,const Transform& p_transform,Vector3 *p_vertices,int* p_count,int p_max) const; void project_range(const Vector3& p_normal,const Transform& p_transform,float& r_min, float& r_max) const; AABB get_aabb() const { AABB aabb( vertex[0], Vector3() ); aabb.expand_to( vertex[1] ); aabb.expand_to( vertex[2] ); return aabb; } bool intersects_aabb(const AABB& p_aabb) const; _FORCE_INLINE_ bool intersects_aabb2(const AABB& p_aabb) const; operator String() const; inline Face3() {} inline Face3(const Vector3 &p_v1,const Vector3 &p_v2,const Vector3 &p_v3) { vertex[0]=p_v1; vertex[1]=p_v2; vertex[2]=p_v3; } }; bool Face3::intersects_aabb2(const AABB& p_aabb) const { Vector3 perp = (vertex[0]-vertex[2]).cross(vertex[0]-vertex[1]); Vector3 half_extents = p_aabb.size * 0.5; Vector3 ofs = p_aabb.pos + half_extents; Vector3 sup =Vector3( (perp.x>0) ? -half_extents.x : half_extents.x, (perp.y>0) ? -half_extents.y : half_extents.y, (perp.z>0) ? -half_extents.z : half_extents.z ); float d = perp.dot(vertex[0]); float dist_a = perp.dot(ofs+sup)-d; float dist_b = perp.dot(ofs-sup)-d; if (dist_a*dist_b > 0) return false; //does not intersect the plane #define TEST_AXIS(m_ax)\ {\ float aabb_min=p_aabb.pos.m_ax;\ float aabb_max=p_aabb.pos.m_ax+p_aabb.size.m_ax;\ float tri_min,tri_max;\ for (int i=0;i<3;i++) {\ if (i==0 || vertex[i].m_ax > tri_max)\ tri_max=vertex[i].m_ax;\ if (i==0 || vertex[i].m_ax < tri_min)\ tri_min=vertex[i].m_ax;\ }\ \ if (tri_max<aabb_min || aabb_max<tri_min)\ return false;\ } TEST_AXIS(x); TEST_AXIS(y); TEST_AXIS(z); #undef TEST_AXIS Vector3 edge_norms[3]={ vertex[0]-vertex[1], vertex[1]-vertex[2], vertex[2]-vertex[0], }; for (int i=0;i<12;i++) { Vector3 from,to; switch(i) { case 0:{ from=Vector3( p_aabb.pos.x+p_aabb.size.x , p_aabb.pos.y , p_aabb.pos.z ); to=Vector3( p_aabb.pos.x , p_aabb.pos.y , p_aabb.pos.z ); } break; case 1:{ from=Vector3( p_aabb.pos.x+p_aabb.size.x , p_aabb.pos.y , p_aabb.pos.z+p_aabb.size.z ); to=Vector3( p_aabb.pos.x+p_aabb.size.x , p_aabb.pos.y , p_aabb.pos.z ); } break; case 2:{ from=Vector3( p_aabb.pos.x , p_aabb.pos.y , p_aabb.pos.z+p_aabb.size.z ); to=Vector3( p_aabb.pos.x+p_aabb.size.x , p_aabb.pos.y , p_aabb.pos.z+p_aabb.size.z ); } break; case 3:{ from=Vector3( p_aabb.pos.x , p_aabb.pos.y , p_aabb.pos.z ); to=Vector3( p_aabb.pos.x , p_aabb.pos.y , p_aabb.pos.z+p_aabb.size.z ); } break; case 4:{ from=Vector3( p_aabb.pos.x , p_aabb.pos.y+p_aabb.size.y , p_aabb.pos.z ); to=Vector3( p_aabb.pos.x+p_aabb.size.x , p_aabb.pos.y+p_aabb.size.y , p_aabb.pos.z ); } break; case 5:{ from=Vector3( p_aabb.pos.x+p_aabb.size.x , p_aabb.pos.y+p_aabb.size.y , p_aabb.pos.z ); to=Vector3( p_aabb.pos.x+p_aabb.size.x , p_aabb.pos.y+p_aabb.size.y , p_aabb.pos.z+p_aabb.size.z ); } break; case 6:{ from=Vector3( p_aabb.pos.x+p_aabb.size.x , p_aabb.pos.y+p_aabb.size.y , p_aabb.pos.z+p_aabb.size.z ); to=Vector3( p_aabb.pos.x , p_aabb.pos.y+p_aabb.size.y , p_aabb.pos.z+p_aabb.size.z ); } break; case 7:{ from=Vector3( p_aabb.pos.x , p_aabb.pos.y+p_aabb.size.y , p_aabb.pos.z+p_aabb.size.z ); to=Vector3( p_aabb.pos.x , p_aabb.pos.y+p_aabb.size.y , p_aabb.pos.z ); } break; case 8:{ from=Vector3( p_aabb.pos.x , p_aabb.pos.y , p_aabb.pos.z+p_aabb.size.z ); to=Vector3( p_aabb.pos.x , p_aabb.pos.y+p_aabb.size.y , p_aabb.pos.z+p_aabb.size.z ); } break; case 9:{ from=Vector3( p_aabb.pos.x , p_aabb.pos.y , p_aabb.pos.z ); to=Vector3( p_aabb.pos.x , p_aabb.pos.y+p_aabb.size.y , p_aabb.pos.z ); } break; case 10:{ from=Vector3( p_aabb.pos.x+p_aabb.size.x , p_aabb.pos.y , p_aabb.pos.z ); to=Vector3( p_aabb.pos.x+p_aabb.size.x , p_aabb.pos.y+p_aabb.size.y , p_aabb.pos.z ); } break; case 11:{ from=Vector3( p_aabb.pos.x+p_aabb.size.x , p_aabb.pos.y , p_aabb.pos.z+p_aabb.size.z ); to=Vector3( p_aabb.pos.x+p_aabb.size.x , p_aabb.pos.y+p_aabb.size.y , p_aabb.pos.z+p_aabb.size.z ); } break; } Vector3 e1=from-to; for (int j=0;j<3;j++) { Vector3 e2=edge_norms[j]; Vector3 axis=vec3_cross( e1, e2 ); if (axis.length_squared()<0.0001) continue; // coplanar //axis.normalize(); Vector3 sup2 =Vector3( (axis.x>0) ? -half_extents.x : half_extents.x, (axis.y>0) ? -half_extents.y : half_extents.y, (axis.z>0) ? -half_extents.z : half_extents.z ); float maxB = axis.dot(ofs+sup2); float minB = axis.dot(ofs-sup2); if (minB>maxB) { SWAP(maxB,minB); } float minT=1e20,maxT=-1e20; for (int k=0;k<3;k++) { float d=axis.dot(vertex[k]); if (d > maxT) maxT=d; if (d < minT) minT=d; } if (maxB<minT || maxT<minB) return false; } } return true; } #endif // FACE3_H