diff --git a/mapview/3D/MV3DElementFloorOutline.h b/mapview/3D/MV3DElementFloorOutline.h
index 420e3e9..f725440 100644
--- a/mapview/3D/MV3DElementFloorOutline.h
+++ b/mapview/3D/MV3DElementFloorOutline.h
@@ -2,12 +2,11 @@
 #define MV3DELEMENTFLOOROUTLINE_H
 
 #include <Indoor/floorplan/v2/Floorplan.h>
-#include <Indoor/wifi/estimate/ray3/ModelFactoryHelper.h>
+#include <Indoor/geo/GPCPolygon2.h>
 
 #include "misc/Cube.h"
 #include "MV3DElement.h"
 
-#include "../../lib/gpc/gpc.h"
 #include "misc/Outline.h"
 
 class MV3DElementFloorOutline : public MV3DElement {
@@ -17,7 +16,7 @@ class MV3DElementFloorOutline : public MV3DElement {
 
 	struct Temp {
 		Point2 cacheSum;
-		Ray3D::Polygon* pol = nullptr;
+        GPCPolygon2* pol = nullptr;
 		std::vector<std::vector<Point3>> trias;
 	};
 
@@ -80,7 +79,7 @@ protected:
 		std::vector<gpc_polygon> add;
 		std::vector<gpc_polygon> rem;
 		if (tmp.pol) {delete tmp.pol;}
-		tmp.pol = new Ray3D::Polygon();
+        tmp.pol = new GPCPolygon2();
 
 		// all to-be-added polygons (filter!)
 		for (Floorplan::FloorOutlinePolygon* poly : polys) {