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Added a second function to compute the distance between a point and a box, according to the fact that you need the distance between the surface of a box or the distance from the filled box (e.g. the distance is 0 inside the box)

This commit is contained in:
Paolo Cignoni 2012-02-09 17:30:54 +00:00
parent 86f636b64b
commit 790cf5d7ef
1 changed files with 29 additions and 2 deletions
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31
vcg/space/distance3.h
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@ -30,11 +30,37 @@
namespace vcg {
/*
* Computes the minimum distance between a 3D box and a point
* @param[in] p The input point
* @param[in] b The input bounding box
* return The distance
* This function returns 0 for points Inside the bbox while the next one return the distance from the surface
*/
template<class Scalar>
Scalar PointFilledBoxDistance(const Point3<Scalar> &p, const Box3<Scalar> &bbox)
{
Scalar dist2 = 0.;
Scalar aux;
for (int k=0 ; k<3 ; ++k)
{
if ( (aux = (p[k]-bbox.min[k]))<0. )
dist2 += aux*aux;
else if ( (aux = (bbox.max[k]-p[k]))<0. )
dist2 += aux*aux;
}
return sqrt(dist2);
}
/*
* Computes the minimum distance between a 3D box and a point
* @param[in] p The input point
* @param[in] b The input bounding box
* @param[out] dist The distance
* Note that this function with respect to the previous one compute the distance between a point
* and the 'surface' of a Box3.
*
*/
template <class ScalarType>
void PointBoxDistance(const Point3<ScalarType> &p,
@ -49,8 +75,9 @@ void PointBoxDistance(const Point3<ScalarType> &p,
const ScalarType dz = std::min<ScalarType>(b.max.Z()-p.Z(), p.Z()-b.min.Z());
dist= std::min<ScalarType>(dx, std::min<ScalarType>(dy, dz));
return;
}
{
ScalarType sq_dist = ScalarType(0);
for (int i=0; i<3; ++i)
@ -81,7 +108,7 @@ void SpherePointDistance(const Sphere3<ScalarType> &sphere,
}
/*
* Computes the minimum distance between a 3D box and a point
* Computes the minimum distance between two spheres
* @param[in] sphere0 The input sphere
* @param[in] sphere1 The input sphere
* @param[out] dist The distance