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added ByPoint quadric initialization

This commit is contained in:
nico 2018-12-01 07:03:06 +11:00
parent a2c22505ed
commit 5ea07c4ada
1 changed files with 19 additions and 0 deletions
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19
vcg/math/quadric.h
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@ -87,6 +87,25 @@ public:
c = -K*K + (ScalarType)(r.Origin()*r.Origin());
}
/*
* Initializes the quadric as the squared distance from a given point.
*
*/
template< class CoordType >
void ByPoint( const CoordType & p ) // Init dato un raggio
{
a[0] = 1; // a11
a[1] = 0; // a12 (=a21)
a[2] = 0; // a13 (=a31)
a[3] = 1; // a22
a[4] = 0; // a23 (=a32)
a[5] = 1; // a33
b[0] = (ScalarType)-2.0*((ScalarType)p.X());
b[1] = (ScalarType)-2.0*((ScalarType)p.Y());
b[2] = (ScalarType)-2.0*((ScalarType)p.Z());
c = pow(p.X(),2) + pow(p.Y(),2)+ pow(p.Z(),2);
}
void SetZero()
{
a[0] = 0;