diff -r fad4a5dd8dee -r 5c0005f63319 src/ui/canvas.h
--- a/src/ui/canvas.h	Wed Feb 26 22:26:05 2020 +0200
+++ b/src/ui/canvas.h	Thu Feb 27 11:56:41 2020 +0200
@@ -16,11 +16,13 @@
 	void mouseMoveEvent(QMouseEvent* event) override;
 	void mousePressEvent(QMouseEvent* event) override;
 	void mouseReleaseEvent(QMouseEvent* event) override;
+	void paintGL() override;
 signals:
 	void newStatusText(const QString& newStatusText);
 	void selectionChanged(const QSet<ldraw::Id>& newSelection);
 private:
 	QPoint lastMousePosition;
+	std::optional<glm::vec3> worldPosition;
 	int totalMouseMove = 0;
 	QSet<ldraw::Id> selection;
 };