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added draft for sphereofsphres enclosing

This commit is contained in:
ganovelli 2007-11-07 09:37:20 +00:00
parent 3bb9c7cbc6
commit c04c5cde70
1 changed files with 34 additions and 17 deletions

51
vcg/space/smallest_enclosing.h
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@ -25,6 +25,9 @@
History History
$Log: not supported by cvs2svn $ $Log: not supported by cvs2svn $
Revision 1.4 2006/09/14 08:46:00 ganovelli
added inclusion of sphere3
Revision 1.3 2006/07/12 12:13:23 zifnab1974 Revision 1.3 2006/07/12 12:13:23 zifnab1974
static keyword only in declaration not in implementation static keyword only in declaration not in implementation
@ -59,6 +62,10 @@ struct SmallestEnclosing {
template <class TetraType> template <class TetraType>
static Sphere3<typename TetraType::ScalarType> SphereOfTetra(const TetraType & t); static Sphere3<typename TetraType::ScalarType> SphereOfTetra(const TetraType & t);
/// computes the smallest enclosing sphere of two spheres
template <class SphereType>
static SphereType SphereOfSpheres( const SphereType & s0,const SphereType & s1);
/// computes the smallest enclosing sphere of a container of spheres /// computes the smallest enclosing sphere of a container of spheres
template <class SphereContType> template <class SphereContType>
static typename SphereContType::value_type SphereOfSpheres( const SphereContType & t); static typename SphereContType::value_type SphereOfSpheres( const SphereContType & t);
@ -77,33 +84,43 @@ SmallestEnclosing::SphereOfTetra(const TetraType & t){
return Sphere3<typename TetraType::ScalarType>( t.Barycenter(),( t.Barycenter() - t.cP(0) ).Norm() ); return Sphere3<typename TetraType::ScalarType>( t.Barycenter(),( t.Barycenter() - t.cP(0) ).Norm() );
} }
template <class SphereType>
SphereType
SmallestEnclosing::
SphereOfSpheres( const SphereType & s0, const SphereType & s1)
{
typename SphereType::ScalarType radius;
vcg::Point3f center;
if(s0.Radius()==-1.0) return s1; else if(s1.Radius()==-1.0) return s0;
float dst = (s1.Center()-s0.Center()).Norm() ;
radius = (dst+s1.Radius()+s0.Radius())/2;
Point3f a=s0.Center();
Point3f b=s1.Center();
Point3f dir = (b-a).Normalize();
a = a - dir*s0.Radius();
b = b + dir*s1.Radius();
center = (a+b)/2.0;
return SphereType(center,radius);
}
template <class SphereContType> template <class SphereContType>
typename SphereContType::value_type typename SphereContType::value_type
SmallestEnclosing:: SmallestEnclosing::
SphereOfSpheres( const SphereContType & spheres) SphereOfSpheres( const SphereContType & spheres)
{ {
typename SphereContType::value_type::ScalarType radius; typename SphereContType::value_type::ScalarType radius;
vcg::Point3f center; typename SphereContType::value_type res;
SphereContType::const_iterator si;
if(spheres.size()==2){ for(si = spheres.begin(); si != spheres.end(); ++si){
const typename SphereContType::value_type & s0 = spheres[0]; res = SphereOfSpheres(res,*si);
const typename SphereContType::value_type & s1 = spheres[1];
float dst = (s1.Center()-s0.Center()).Norm() ;
radius = (dst+s1.Radius()+s0.Radius())/2;
Point3f a=s0.Center();
Point3f b=s1.Center();
Point3f dir = (b-a).Normalize();
a = a - dir*s0.Radius();
b = b + dir*s1.Radius();
center = (a+b)/2.0;
}
else{
assert(0);
} }
return typename SphereContType::value_type(center,radius); return res;
} }
} }