I created the tool with 2019.3 but it may work in earlier versions as well. Have you added the material to the materials list that you are showing in the picture? How does the material look? It's provably best if you could record a quick video.
I will download 2018.4 tomorrow to see if that has an effect on anything but I'm guessing that you are creating a new project so what is holding you back to that Unity version?
the materials list is a foldout. Click on it and there will be a list where you are able to add a material which changes it visually. The physic material property takes in a physic material. I cam sent a short clip in a few hours.
EDIT:
I've tested it with 2018.4 and there are some names that are different so there are a few manuell steps you need to follow:
1. Remove all [SerializeReference] attribtues in RoadCreator and Intersection
2. Change DrawPositionHandle in the Utility class to the following:
public static Vector3 DrawPositionHandle(float handleSize, Vector3 position, Quaternion rotation) { Color color = Handles.color; Handles.color = Handles.xAxisColor; position = Handles.Slider(position, rotation * Vector3.right, handleSize, Handles.ArrowHandleCap, EditorPrefs.GetFloat("MoveSnapX")); Handles.color = Handles.yAxisColor; position = Handles.Slider(position, rotation * Vector3.up, handleSize, Handles.ArrowHandleCap, EditorPrefs.GetFloat("MoveSnapY")); Handles.color = Handles.zAxisColor; position = Handles.Slider(position, rotation * Vector3.forward, handleSize, Handles.ArrowHandleCap, EditorPrefs.GetFloat("MoveSnapZ")); Handles.color = Handles.centerColor; position = Handles.FreeMoveHandle(position, rotation, handleSize * 0.15f, new Vector3(EditorPrefs.GetFloat("MoveSnapX"), EditorPrefs.GetFloat("MoveSnapY"), EditorPrefs.GetFloat("MoveSnapZ")), Handles.RectangleHandleCap); Handles.color = color; return position; }
3. Change SceneView.duringSceneGui += OnSceneGUI; to SceneView.onSceneGUIDelegate += OnSceneGUI; in ContextClickSelect constructor.
There is one more steps but I'll upload a update with that in a few hours which fixing you not being able to open the material foldout. If you want to fix it now then change EditorGUILayout.PropertyField(serializedObject.FindProperty("lanes").GetArrayElementAtIndex(tab).FindPropertyRelative("materials"));
to EditorGUILayout.PropertyField(serializedObject.FindProperty("lanes").GetArrayElementAtIndex(tab).FindPropertyRelative("materials"), true); in RoadEditor.
I'm sorry that you have to change things manually but as Unity changes names I can't create a version that automatically works for both and these changes should only take like a minute with Find And Replace.
EDIT 2: The update has now been posted so if you download it and also follow the instructions above the tools should work in your Unity version.
