diff -r cef43609a374 -r 0133e565e072 src/linetypes/subfilereference.cpp
--- a/src/linetypes/subfilereference.cpp	Sat Dec 14 23:00:01 2019 +0200
+++ b/src/linetypes/subfilereference.cpp	Wed Jan 01 17:45:56 2020 +0200
@@ -1,12 +1,10 @@
 #include "subfilereference.h"
+#include "documentmanager.h"
 
-linetypes::SubfileReference::SubfileReference(
-	const Point3D& position,
-	const Matrix3x3& transformation,
+linetypes::SubfileReference::SubfileReference(const Matrix4x4& transformation,
 	const QString& referenceName,
 	const Color color) :
 	ColoredObject{color},
-	position{position},
 	transformation{transformation},
 	referenceName{referenceName}
 {
@@ -16,8 +14,6 @@
 {
 	switch (property)
 	{
-	case Property::Position:
-		return this->position;
 	case Property::Transformation:
 		return QVariant::fromValue(this->transformation);
 	case Property::ReferenceName:
@@ -34,11 +30,8 @@
 {
 	switch (property)
 	{
-	case Property::Position:
-		this->position = value.value<Point3D>();
-		return SetPropertyResult::Success;
 	case Property::Transformation:
-		this->transformation = value.value<Matrix3x3>();
+		this->transformation = value.value<Matrix4x4>();
 		return SetPropertyResult::Success;
 	case Property::ReferenceName:
 		this->referenceName = value.toString();
@@ -50,5 +43,40 @@
 
 QString linetypes::SubfileReference::textRepresentation() const
 {
-	return referenceName + " " + vertexToStringParens(this->position);
+	return referenceName + " " + vertexToStringParens(this->position());
 }
+
+void linetypes::SubfileReference::getPolygons(
+	std::vector<gl::Polygon>& polygons,
+	GetPolygonsContext* context) const
+{
+	Model* model = this->resolve(context->documents);
+	if (model != nullptr)
+	{
+		const std::vector<gl::Polygon> modelPolygons = model->getPolygons(context->documents);
+		polygons.reserve(polygons.size() + modelPolygons.size());
+		for (gl::Polygon polygon : modelPolygons)
+		{
+			for (int i = 0; i < polygon.numPolygonVertices(); i += 1)
+			{
+				polygon.vertices[i] = math::transform(polygon.vertices[1], this->transformation);
+			}
+			if (polygon.color == colors::main)
+			{
+				polygon.color = this->colorIndex;
+			}
+			polygon.id = this->id;
+			polygons.push_back(polygon);
+		}
+	}
+}
+
+Point3D linetypes::SubfileReference::position() const
+{
+	return {this->transformation(0, 3), this->transformation(1, 3), this->transformation(2, 3)};
+}
+
+Model* linetypes::SubfileReference::resolve(DocumentManager* documents) const
+{
+	return documents->findModelByName(this->referenceName);
+}