examples/real_lens_group.rs

+use opossum::error::OpossumError;
+use opossum::nodes::{Dummy, NodeGroup};
+use opossum::OpticScenery;
+use std::path::Path;
+
+fn main() -> Result<(), OpossumError> {
+    let mut scenery = OpticScenery::new();
+
+    let mut group1 = NodeGroup::new("real lens group");
+    group1.expand_view(true);
+    let g1_n1 = group1.add_node(Dummy::new("surface"))?;
+    let g1_n2 = group1.add_node(Dummy::new("material propagation"))?;
+    let g1_n3 = group1.add_node(Dummy::new("surface"))?;
+    group1.connect_nodes(g1_n1, "rear", g1_n2, "front")?;
+    group1.connect_nodes(g1_n2, "rear", g1_n3, "front")?;
+
+    let _scene_g1 = scenery.add_node(group1);
+    scenery.save_to_file(Path::new("playground/real_lens_group.opm"))?;
+    Ok(())
+}

examples/simple_for_talk.rs

+use opossum::error::OpossumError;
+use opossum::nodes::{Dummy, Source, EnergyMeter};
+use opossum::OpticScenery;
+use std::path::Path;
+
+fn main() -> Result<(), OpossumError> {
+    let mut scenery = OpticScenery::new();
+    scenery.set_description("OpticScenery demo");
+    let node1 = scenery.add_node(Source::default());
+    let node2 = scenery.add_node(Dummy::new("optic"));
+    let node3 = scenery.add_node(EnergyMeter::default());
+    scenery.connect_nodes(node1, "out1", node2, "front")?;
+    scenery.connect_nodes(node2, "rear", node3, "in1")?;
+    scenery.save_to_file(Path::new("playground/simple_for_talk.opm"))?;
+    Ok(())
+}

files_for_testing/dot/to_dot_empty_LR.dot

@@ -3,8 +3,8 @@ digraph {
 	compound = true;
 	rankdir = "LR";
 	label="Test"
-	fontname="Helvetica,Arial,sans-serif"
-	node [fontname="Helvetica,Arial,sans-serif" fontsize = 10]
-	edge [fontname="Helvetica,Arial,sans-serif"]
+	fontname="Helvetica"
+	node [fontname="Helvetica" fontsize = 10]
+	edge [fontname="Helvetica"]
 
 }

files_for_testing/dot/to_dot_empty_TB.dot

@@ -3,8 +3,8 @@ digraph {
 	compound = true;
 	rankdir = "TB";
 	label="Test"
-	fontname="Helvetica,Arial,sans-serif"
-	node [fontname="Helvetica,Arial,sans-serif" fontsize = 10]
-	edge [fontname="Helvetica,Arial,sans-serif"]
+	fontname="Helvetica"
+	node [fontname="Helvetica" fontsize = 10]
+	edge [fontname="Helvetica"]
 
 }

files_for_testing/dot/to_dot_full_LR.dot

@@ -3,9 +3,9 @@ digraph {
 	compound = true;
 	rankdir = "LR";
 	label="SceneryTest"
-	fontname="Helvetica,Arial,sans-serif"
-	node [fontname="Helvetica,Arial,sans-serif" fontsize = 10]
-	edge [fontname="Helvetica,Arial,sans-serif"]
+	fontname="Helvetica"
+	node [fontname="Helvetica" fontsize = 10]
+	edge [fontname="Helvetica"]
 
 	i0 [
 		shape=plaintext

files_for_testing/dot/to_dot_full_LR.txt

@@ -3,9 +3,9 @@ digraph {
 	compound = true;
 	rankdir = "LR";
 	label="SceneryTest"
-	fontname="Helvetica,Arial,sans-serif"
-	node [fontname="Helvetica,Arial,sans-serif" fontsize = 10]
-	edge [fontname="Helvetica,Arial,sans-serif"]
+	fontname="Helvetica"
+	node [fontname="Helvetica" fontsize = 10]
+	edge [fontname="Helvetica"]
 
 	i0 [
 		shape=plaintext

files_for_testing/dot/to_dot_full_TB.dot

@@ -3,9 +3,9 @@ digraph {
 	compound = true;
 	rankdir = "TB";
 	label="SceneryTest"
-	fontname="Helvetica,Arial,sans-serif"
-	node [fontname="Helvetica,Arial,sans-serif" fontsize = 10]
-	edge [fontname="Helvetica,Arial,sans-serif"]
+	fontname="Helvetica"
+	node [fontname="Helvetica" fontsize = 10]
+	edge [fontname="Helvetica"]
 
 	i0 [
 		shape=plaintext

files_for_testing/dot/to_dot_w_node_LR.dot

@@ -3,9 +3,9 @@ digraph {
 	compound = true;
 	rankdir = "LR";
 	label="SceneryTest"
-	fontname="Helvetica,Arial,sans-serif"
-	node [fontname="Helvetica,Arial,sans-serif" fontsize = 10]
-	edge [fontname="Helvetica,Arial,sans-serif"]
+	fontname="Helvetica"
+	node [fontname="Helvetica" fontsize = 10]
+	edge [fontname="Helvetica"]
 
 	i0 [
 		shape=plaintext

files_for_testing/dot/to_dot_w_node_TB.dot

@@ -3,9 +3,9 @@ digraph {
 	compound = true;
 	rankdir = "TB";
 	label="SceneryTest"
-	fontname="Helvetica,Arial,sans-serif"
-	node [fontname="Helvetica,Arial,sans-serif" fontsize = 10]
-	edge [fontname="Helvetica,Arial,sans-serif"]
+	fontname="Helvetica"
+	node [fontname="Helvetica" fontsize = 10]
+	edge [fontname="Helvetica"]
 
 	i0 [
 		shape=plaintext

src/main.rs

@@ -36,7 +36,7 @@ fn do_it() -> OpmResult<()> {
     dot_path.set_extension("dot");
     print!("Write diagram to {}...", dot_path.display());
     let mut output = File::create(dot_path).unwrap();
-    write!(output, "{}", scenery.to_dot("")?).unwrap();
+    write!(output, "{}", scenery.to_dot("LR")?).unwrap();
     println!("Success");
     print!("\nAnalyzing...");
     scenery.analyze(&opossum_args.analyzer)?;

src/nodes/reference.rs

@@ -65,6 +65,8 @@ impl NodeReference {
     pub fn from_node(node: OpticRef) -> Self {
         let mut props = create_default_props();
         props.set("reference id", node.uuid().into()).unwrap();
+        let ref_name = format!("ref ({})", node.optical_ref.borrow().name());
+        props.set("name", Proptype::String(ref_name)).unwrap();
         Self {
             reference: Some(Rc::downgrade(&node.optical_ref)),
             props,
@@ -173,6 +175,16 @@ mod test {
         assert!(node.reference.is_some());
     }
     #[test]
+    fn from_node_name() {
+        let mut scenery = OpticScenery::default();
+        let idx = scenery.add_node(Dummy::default());
+        let node_ref = scenery.node(idx).unwrap();
+        let node_name = format!("ref ({})", node_ref.optical_ref.borrow().name());
+        let node = NodeReference::from_node(node_ref);
+
+        assert_eq!(node.name(), node_name);
+    }
+    #[test]
     fn assign_reference() {
         let mut scenery = OpticScenery::default();
         let idx = scenery.add_node(Dummy::default());

src/optic_graph.rs

@@ -240,7 +240,12 @@ impl<'de> Deserialize<'de> for OpticGraph {
                                 Uuid::nil()
                             };
                         let ref_node = g.node(uuid).unwrap();
+                        let ref_name = format!("ref ({})", ref_node.optical_ref.borrow().name());
                         refnode.assign_reference(ref_node);
+
+                        refnode
+                            .set_property("name", Proptype::String(ref_name))
+                            .unwrap();
                     }
                 }
                 for edge in edges.iter() {

src/optic_scenery.rs

@@ -149,9 +149,9 @@ impl OpticScenery {
         dot_string.push_str("\tcompound = true;\n");
         dot_string.push_str(&format!("\trankdir = \"{}\";\n", rankdir));
         dot_string.push_str(&format!("\tlabel=\"{}\"\n", self.description()));
-        dot_string.push_str("\tfontname=\"Helvetica,Arial,sans-serif\"\n");
-        dot_string.push_str("\tnode [fontname=\"Helvetica,Arial,sans-serif\" fontsize = 10]\n");
-        dot_string.push_str("\tedge [fontname=\"Helvetica,Arial,sans-serif\"]\n\n");
+        dot_string.push_str("\tfontname=\"Helvetica\"\n");
+        dot_string.push_str("\tnode [fontname=\"Helvetica\" fontsize = 10]\n");
+        dot_string.push_str("\tedge [fontname=\"Helvetica\"]\n\n");
         dot_string
     }
     fn create_node_edge_str(