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- Changed name of intersection function between plane and triangle from Intersection to IntersectionPlaneTriangle. 

- Added Intersection_Plane_Sphere function.
This commit is contained in:
Nico Pietroni 2007-04-04 23:19:40 +00:00
parent e7cf8d9203
commit 477c03ffd1
1 changed files with 43 additions and 1 deletions
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44
vcg/space/intersection3.h
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@ -24,6 +24,9 @@
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$Log: not supported by cvs2svn $
Revision 1.28 2007/02/21 02:40:52 m_di_benedetto
Added const qualifier to bbox parameter in Intersection_Triangle_Box().
Revision 1.27 2006/10/25 16:04:32 pietroni
added intersection control between bounding boxes for intersection between segment and triangle function
@ -214,7 +217,7 @@ namespace vcg {
/// intersection between plane and triangle
// not optimal: uses plane-segment intersection (and the fact the two or none edges can be intersected)
template<typename TRIANGLETYPE>
inline bool Intersection( const Plane3<typename TRIANGLETYPE::ScalarType> & pl,
inline bool IntersectionPlaneTriangle( const Plane3<typename TRIANGLETYPE::ScalarType> & pl,
const TRIANGLETYPE & tr,
Segment3<typename TRIANGLETYPE::ScalarType> & sg){
typedef typename TRIANGLETYPE::ScalarType T;
@ -603,6 +606,45 @@ bool Intersection_Plane_Box(const vcg::Plane3<ScalarType> &pl,
return false;
}
///if exists return the center and ardius of circle
///that is the intersectionk between the sphere and
//the plane
template <class ScalarType>
bool Intersection_Plane_Sphere(const vcg::Plane3<ScalarType> &pl,
const vcg::Sphere3<ScalarType> &sphere,
vcg::Point3<ScalarType> &center,
vcg::Point3<ScalarType> &radius)
{
///set the origin on the center of the sphere
vcg::Plane3<ScalarType> pl1;
vcg::Point3<ScalarType> p_plane=pl.Direction()*pl.Offset();
vcg::Point3<ScalarType> p_plane=p_plane-sphere.Center();
///set again the plane
pl1.Set(p_plane,pl.Direction());
///test d must be positive
d=pl1.Offset();
vcg::Point3<ScalarType> n=pl1.Direction();
///invert d if is <0
if (d<0)
{
n=-n;
d=-d;
}
///no intersection occour
if (d>r)
return false;
else
{
///calculate center and translate in back
center=n*d;
center+=sphere.Center();
radius=math::Sqrt((r*r)-(d*d));
}
}
template<class ScalarType>
bool Intersection_Triangle_Box(const vcg::Box3<ScalarType> &bbox,
const vcg::Point3<ScalarType> &p0,