110 lines
4.2 KiB
C++
110 lines
4.2 KiB
C++
#pragma once
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/****************************************************************************
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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 1.3 2006/07/12 12:13:23 zifnab1974
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static keyword only in declaration not in implementation
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Revision 1.2 2006/07/10 10:38:16 turini
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minor changes in SphereOfTetra()
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Revision 1.1 2006/07/06 12:37:18 ganovelli
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draft version. For the triangle is not tehe smallest enclosing sphere and for the set of spheres works only for two spheres
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****************************************************************************/
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#include <vcg/space/triangle3.h>
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#include <vcg/space/tetra3.h>
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#include <vcg/space/sphere3.h>
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#include <assert.h>
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namespace vcg{
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/** \addtogroup space */
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/*@{*/
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/**
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Class for function computing the smallest enclosing bounding volume
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*/
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struct SmallestEnclosing {
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/// computes the smallest enclosing sphere of a triangle
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template <class TriangleType>
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static Sphere3<typename TriangleType::ScalarType> SphereOfTriangle(const TriangleType & t);
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/// computes the smallest enclosing sphere of a tetrahedron
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template <class TetraType>
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static Sphere3<typename TetraType::ScalarType> SphereOfTetra(const TetraType & t);
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/// computes the smallest enclosing sphere of a container of spheres
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template <class SphereContType>
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static typename SphereContType::value_type SphereOfSpheres( const SphereContType & t);
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};
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/*@}*/
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template <class TriangleType>
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Sphere3<typename TriangleType::ScalarType>
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SmallestEnclosing::SphereOfTriangle(const TriangleType & t){
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return Sphere3<typename TriangleType::ScalarType>(t.Barycenter(),(t.Barycenter()-t.cP(0)).Norm() );
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}
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template <class TetraType>
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Sphere3<typename TetraType::ScalarType>
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SmallestEnclosing::SphereOfTetra(const TetraType & t){
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return Sphere3<typename TetraType::ScalarType>( t.Barycenter(),( t.Barycenter() - t.cP(0) ).Norm() );
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}
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template <class SphereContType>
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typename SphereContType::value_type
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SmallestEnclosing::
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SphereOfSpheres( const SphereContType & spheres)
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{
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typename SphereContType::value_type::ScalarType radius;
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vcg::Point3f center;
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if(spheres.size()==2){
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const typename SphereContType::value_type & s0 = spheres[0];
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const typename SphereContType::value_type & s1 = spheres[1];
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float dst = (s1.Center()-s0.Center()).Norm() ;
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radius = (dst+s1.Radius()+s0.Radius())/2;
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Point3f a=s0.Center();
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Point3f b=s1.Center();
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Point3f dir = (b-a).Normalize();
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a = a - dir*s0.Radius();
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b = b + dir*s1.Radius();
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center = (a+b)/2.0;
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}
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else{
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assert(0);
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}
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return typename SphereContType::value_type(center,radius);
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}
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}
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