return badDistance;
}
+//================================================================================
+/*!
+ * \brief Returns barycentric coordinates of a point within a triangle.
+ * A not returned bc2 = 1. - bc0 - bc1.
+ * The point lies within the triangle if ( bc0 >= 0 && bc1 >= 0 && bc0+bc1 <= 1 )
+ */
+//================================================================================
+
+void SMESH_MeshAlgos::GetBarycentricCoords( const gp_XY& p,
+ const gp_XY& t0,
+ const gp_XY& t1,
+ const gp_XY& t2,
+ double & bc0,
+ double & bc1)
+{
+ const double // matrix 2x2
+ T11 = t0.X()-t2.X(), T12 = t1.X()-t2.X(),
+ T21 = t0.Y()-t2.Y(), T22 = t1.Y()-t2.Y();
+ const double Tdet = T11*T22 - T12*T21; // matrix determinant
+ if ( Abs( Tdet ) < std::numeric_limits<double>::min() )
+ {
+ bc0 = bc1 = 2.;
+ return;
+ }
+ // matrix inverse
+ const double t11 = T22, t12 = -T12, t21 = -T21, t22 = T11;
+ // vector
+ const double r11 = p.X()-t2.X(), r12 = p.Y()-t2.Y();
+ // barycentric coordinates: mutiply matrix by vector
+ bc0 = (t11 * r11 + t12 * r12)/Tdet;
+ bc1 = (t21 * r11 + t22 * r12)/Tdet;
+}
+
//=======================================================================
//function : FindFaceInSet
//purpose : Return a face having linked nodes n1 and n2 and which is
