+ bool hasInt = ( t > 0. && t < segLen );
+
+ if ( hasInt && det < EPSILON ) // t is inaccurate, additionally check
+ {
+ gp_XYZ triNorm = edge1 ^ edge2;
+ gp_XYZ int0vec = Pint.XYZ() - vert0;
+ gp_XYZ in = triNorm ^ edge1; // dir inside triangle from edge1
+ double dot = int0vec * in;
+ if ( dot < 0 && dot / triNorm.Modulus() < -EPSILON )
+ return false;
+ in = edge2 ^ triNorm;
+ dot = int0vec * in;
+ if ( dot < 0 && dot / triNorm.Modulus() < -EPSILON )
+ return false;
+ gp_XYZ int1vec = Pint.XYZ() - vert1;
+ in = triNorm ^ ( vert2 - vert1 );
+ dot = int1vec * in;
+ if ( dot < 0 && dot / triNorm.Modulus() < -EPSILON )
+ return false;
+ }
+ return hasInt;