diff -r d891da20abca -r 6ad27b7d2697 src/invert.cpp
--- a/src/invert.cpp	Wed Jun 29 14:11:58 2022 +0300
+++ b/src/invert.cpp	Wed Jun 29 14:43:42 2022 +0300
@@ -41,10 +41,10 @@
 	visitPolygon<void>(
 		[](LineSegment&) {},
 		[](Triangle& tri) {
-			std::swap(tri.p1, tri.p2);
+			invert(tri);
 		},
 		[](Quadrilateral& quad) {
-			std::swap(quad.p1, quad.p3);
+			invert(quad);
 		},
 		[](ConditionalEdge&) {},
 		polygon);