diff --git a/src/drone_controller.cc b/src/drone_controller.cc
index dbe9a00..ffac66f 100644
--- a/src/drone_controller.cc
+++ b/src/drone_controller.cc
@@ -76,6 +76,25 @@ void DroneController::drawTrajectory(QOpenGLExtraFunctions *f, const Drone &d) c
 }
 
 
+void DroneController::drawSupportLine(QOpenGLExtraFunctions *f, const Drone &d) const {
+	OpenGLWidget::instance->getLineProgram()->bind();
+	OpenGLWidget::instance->getLineProgram()->setUniformValue("color", .2, .2, .2);
+	GLfloat data[6] = {
+		d.getPos().x(), 0, d.getPos().z(),
+		d.getPos().x(), d.getPos().y(), d.getPos().z(),
+	};
+	f->glEnableVertexAttribArray(0);
+	f->glBindBuffer(GL_ARRAY_BUFFER, 0);
+	f->glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, data);
+	glLineWidth(2);
+	f->glDisable(GL_CULL_FACE);
+	f->glDrawArrays(GL_LINES, 0, 2);
+	f->glEnable(GL_CULL_FACE);
+	OpenGLWidget::instance->getLineProgram()->release();
+	OpenGLWidget::instance->getMainProgram()->bind();
+}
+
+
 void DroneController::draw(QOpenGLExtraFunctions *f) const {
 	const QVector<QPair<int, int>> &col = collisions[frame];
 	for (const Drone &d : drones) {
@@ -95,6 +114,9 @@ void DroneController::draw(QOpenGLExtraFunctions *f) const {
 		if (draw_trajectories) {
 			drawTrajectory(f, d);
 		}
+		if (draw_support_lines) {
+			drawSupportLine(f, d);
+		}
 	}
 }
 
@@ -196,3 +218,8 @@ void DroneController::setDrawTrajectories(bool enable) {
 	draw_trajectories = enable;
 	OpenGLWidget::instance->update();
 }
+
+void DroneController::setDrawSupportLines(bool enable) {
+	draw_support_lines = enable;
+	OpenGLWidget::instance->update();
+}
diff --git a/src/drone_controller.hh b/src/drone_controller.hh
index 7ff087a..fb6dd4e 100644
--- a/src/drone_controller.hh
+++ b/src/drone_controller.hh
@@ -24,6 +24,7 @@ class DroneController : public QObject, public Painter {
 	QTimer sphere_timer;
 	QMap<int, QVector<QPair<int, int>>> collisions;
 	bool draw_trajectories = false;
+	bool draw_support_lines = false;
 
 	static OpenGLMesh *sphere;
 	static const unsigned char sphere_neutral[];
@@ -31,6 +32,7 @@ class DroneController : public QObject, public Painter {
 	static bool collides(const Drone &a, const Drone &b, double radius);
 
 	void drawTrajectory(QOpenGLExtraFunctions *f, const Drone &d) const;
+	void drawSupportLine(QOpenGLExtraFunctions *f, const Drone &d) const;
 
 public:
 	DroneController(const QJsonObject &json);
@@ -55,6 +57,7 @@ public slots:
 	void computeCollisions(double sphere_radius);
 	void displaySpheres(double sphere_radius);
 	void setDrawTrajectories(bool enable);
+	void setDrawSupportLines(bool enable);
 };
 
 
diff --git a/src/main_window.cc b/src/main_window.cc
index 0471641..ac7bd58 100644
--- a/src/main_window.cc
+++ b/src/main_window.cc
@@ -91,6 +91,8 @@ void MainWindow::open(const QString &path) {
 			dc, &DroneController::displaySpheres);
 	connect(settings_pane, &SettingsPane::toggledTrajectories,
 			dc, &DroneController::setDrawTrajectories);
+	connect(settings_pane, &SettingsPane::toggledSupportLines,
+			dc, &DroneController::setDrawSupportLines);
 	settings_pane->setEnabled(true);
 
 	glw.setPainter(dc);