diff -r cef43609a374 -r 0133e565e072 src/linetypes/subfilereference.h
--- a/src/linetypes/subfilereference.h	Sat Dec 14 23:00:01 2019 +0200
+++ b/src/linetypes/subfilereference.h	Wed Jan 01 17:45:56 2020 +0200
@@ -2,6 +2,8 @@
 #include "object.h"
 #include "matrix.h"
 
+class Model;
+
 namespace linetypes
 {
 	class SubfileReference;
@@ -12,15 +14,16 @@
 public:
 	SubfileReference() = default;
 	SubfileReference(
-		const Point3D& position,
-		const Matrix3x3& transformation,
+		const Matrix4x4& transformation,
 		const QString &referenceName,
 		const Color color = colors::main);
 	QVariant getProperty(Property property) const override;
 	SetPropertyResult setProperty(Property property, const QVariant& value) override;
 	QString textRepresentation() const override;
+	void getPolygons(std::vector<gl::Polygon>& polygons, GetPolygonsContext* context) const override;
+	Point3D position() const;
 private:
-	Point3D position;
-	Matrix3x3 transformation;
+	Model* resolve(DocumentManager* documents) const;
+	Matrix4x4 transformation;
 	QString referenceName;
 };