diff -r cd6704009eb9 -r 3c10f0e2fbe0 src/gl/partrenderer.h
--- a/src/gl/partrenderer.h	Thu Feb 06 23:41:20 2020 +0200
+++ b/src/gl/partrenderer.h	Fri Feb 07 01:58:34 2020 +0200
@@ -22,6 +22,7 @@
 		QWidget* parent = nullptr);
 	~PartRenderer() override;
 	void setRenderPreferences(const gl::RenderPreferences& newPreferences);
+	void setHighlight(ldraw::Id highlightedId);
 protected:
 	ldraw::Id pick(const QPoint& where);
 	void initializeGL() override;
@@ -43,6 +44,7 @@
 	glm::mat4 projectionMatrix;
 	glm::mat4 viewMatrix;
 	glm::quat modelQuaternion;
+	ldraw::Id highlighted = ldraw::NULL_ID;
 	static constexpr double MIN_ZOOM = 0.0;
 	static constexpr double MAX_ZOOM = 3.0;
 	double zoom = 1.0;