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added check if length of segment is zero then function SegmentPointDistance still works

This commit is contained in:
Nico Pietroni 2012-05-25 13:32:48 +00:00
parent c469b5b948
commit d4ad0bd6f6
1 changed files with 17 additions and 7 deletions
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24
vcg/space/distance3.h
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@ -227,13 +227,23 @@ void SegmentPointSquaredDistance( Segment3<ScalarType> s,
Point3< ScalarType > &closest,
ScalarType &sqr_dist)
{
Point3<ScalarType> e = s.P1()-s.P0();
ScalarType t = ((p-s.P0())*e)/e.SquaredNorm();
if(t<0) t = 0;
else if(t>1) t = 1;
closest = s.P0()+e*t;
sqr_dist = SquaredDistance(p,closest);
assert(!math::IsNAN(sqr_dist));
Point3<ScalarType> e = s.P1()-s.P0();
ScalarType EPS=0.00000001;
if (e.Norm()<EPS)
{
Point3<ScalarType> AvP=(s.P0()+s.P1())/2.0;
closest=AvP;
sqr_dist=(AvP-p).Norm();
}
else
{
ScalarType t = ((p-s.P0())*e)/e.SquaredNorm();
if(t<0) t = 0;
else if(t>1) t = 1;
closest = s.P0()+e*t;
sqr_dist = SquaredDistance(p,closest);
assert(!math::IsNAN(sqr_dist));
}
}
/*