public static boolean isPointsIntersectiongWithEdge(
IVec2 pt1, IVec2 pt2, IVec2 edgePt1, IVec2 edgePt2, IVec2 edgePt3) {
IVec2 diff1 = edgePt2.diff(edgePt1);
IVec2 diff2 = edgePt3.diff(edgePt2);
// edge bent inward; no intersection
if (diff1.cross(diff2).z >= 0) return false;
// edge bent outward
if (isFaceDirectionOnEdgeCorrect(edgePt1, edgePt2, pt1)
&& isFaceDirectionOnEdgeCorrect(edgePt1, edgePt2, pt2)) return false;
if (isFaceDirectionOnEdgeCorrect(edgePt2, edgePt3, pt1)
&& isFaceDirectionOnEdgeCorrect(edgePt2, edgePt3, pt2)) return false;
IVec2 bisector1 = diff1.neg().bisect(diff2);
IVec2 bisector2 = pt1.diff(edgePt2).bisect(pt2.diff(edgePt2));
if (bisector1.dot(bisector2) > 0) return true;
return false;
}
