143 lines
5.5 KiB
C++
143 lines
5.5 KiB
C++
/****************************************************************************
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* VCGLib o o *
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* Visual and Computer Graphics Library o o *
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* _ O _ *
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* Copyright(C) 2004 \/)\/ *
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* Visual Computing Lab /\/| *
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* ISTI - Italian National Research Council | *
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* \ *
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* All rights reserved. *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License (http://www.gnu.org/licenses/gpl.txt) *
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* for more details. *
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* *
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****************************************************************************/
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/****************************************************************************
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History
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$Log: not supported by cvs2svn $
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Revision 1.1 2004/04/21 14:22:27 cignoni
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Initial Commit
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****************************************************************************/
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#ifndef __VCGLIB_INTERSECTION_3
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#define __VCGLIB_INTERSECTION_3
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#include <vcg/space/point3.h>
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#include <vcg/space/line3.h>
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#include <vcg/space/plane3.h>
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#include <vcg/space/segment3.h>
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#include <vcg/space/sphere3.h>
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#include <vcg/space/triangle3.h>
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#include <vcg/space/intersection/triangle_triangle3.h>
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/** \addtogroup space */
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/*@{*/
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/**
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Function computing the intersection between couple of geometric primitives in
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3 dimension
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*/
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namespace vcg {
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/// interseciton between sphere and line
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template<class T>
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inline bool Intersection( const Sphere3<T> & sp, const Line3<T> & li, Point3<T> & p0,Point3<T> & p1 ){
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// Per prima cosa si sposta il sistema di riferimento
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// fino a portare il centro della sfera nell'origine
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Point3<T> neworig=li.Origin()-sp.Center();
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// poi si risolve il sistema di secondo grado (con maple...)
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T t1 = li.Direction().x()*li.Direction().x();
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T t2 = li.Direction().y()*li.Direction().y();
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T t3 = li.Direction().z()*li.Direction().z();
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T t6 = neworig.y()*li.Direction().y();
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T t7 = neworig.x()*li.Direction().x();
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T t8 = neworig.z()*li.Direction().z();
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T t15 = sp.Radius()*sp.Radius();
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T t17 = neworig.z()*neworig.z();
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T t19 = neworig.y()*neworig.y();
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T t21 = neworig.x()*neworig.x();
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T t28 = 2.0*t7*t6+2.0*t6*t8+2.0*t7*t8+t1*t15-t1*t17-t1*t19-t2*t21+t2*t15-t2*t17-t3*t21+t3*t15-t3*t19;
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if(t28<0) return false;
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T t29 = sqrt(t28);
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T val0 = 1/(t1+t2+t3)*(-t6-t7-t8+t29);
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T val1 = 1/(t1+t2+t3)*(-t6-t7-t8-t29);
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p0=li.P(val0);
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p1=li.P(val1);
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return true;
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}
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/// intersection between line and plane
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template<class T>
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inline bool Intersection( const Plane3<T> & pl, const Line3<T> & li, Point3<T> & po){
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const T epsilon = T(1e-8);
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T k = pl.n * li.dire; // Compute 'k' factor
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if( (k > -epsilon) && (k < epsilon))
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return false;
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T r = (pl.d - pl.n*li.orig)/k; // Compute ray distance
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po = li.orig + li.dire*r;
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return true;
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}
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/// intersection between segment and plane
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template<class T>
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inline bool Intersection( const Plane3<T> & pl, const Segment3<T> & sg, Point3<T> & po){
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const T epsilon = T(1e-8);
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T k = pl.d - pl.n * (sg.P1()-sg.P0());
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if( (k > -epsilon) && (k < epsilon))
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return false;
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T r = (pl.d - pl.n*sg.P0())/k; // Compute ray distance
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if( (r<0) || (r > 1.0))
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return false;
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po = sg.P0()*(1-r)+sg.P1() * r;
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return true;
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}
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/// intersection between two triangles
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template<class T>
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inline bool Intersection( Triangle3<T> t0,Triangle3<T> t1){
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return NoDivTriTriIsect(t0.P0(0),t0.P0(1),t0.P0(2),
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t1.P0(0),t1.P0(1),t1.P0(2));
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}
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template<class T>
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inline bool Intersection( Point3<T> V0,Point3<T> V1,Point3<T> V2,
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Point3<T> U0,Point3<T> U1,Point3<T> U2){
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return NoDivTriTriIsect(V0,V1,V2,U0,U1,U2);
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}
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template<class T>
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inline bool Intersection( Point3<T> V0,Point3<T> V1,Point3<T> V2,
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Point3<T> U0,Point3<T> U1,Point3<T> U2,int *coplanar,
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Point3<T> &isectpt1,Point3<T> &isectpt2){
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return tri_tri_intersect_with_isectline(V0,V1,V2,U0,U1,U2,
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coplanar,isectpt1,isectpt2);
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}
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template<class T>
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inline bool Intersection( Triangle3<T> t0,Triangle3<T> t1,bool &coplanar,
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Segment3<T> & sg){
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Point3<T> ip0,ip1;
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return tri_tri_intersect_with_isectline(t0.P0(0),t0.P0(1),t0.P0(2),
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t1.P0(0),t1.P0(1),t1.P0(2),
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coplanar,sg.P0(),sg.P1()
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);
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}
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} // end namespace
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#endif |