Seems like a basic question, but have been poking around the internet for a couple of hours and have had no luck.
Is there any way to draw lines (or handles) inside the inspector GUI? I’d like to add a custom graph visualization for a class of mine and so far I’m not having any luck.
Sure there are. I am not sure how, but, I would imagine you would have to access the gizmo class. If you just want to plug and play so to speak and they do not need any real purpose, you could use iTween’s visual editor.
The Behavior Designer grid background is drawn using GL class. While I use it within an EditorWindow script I imagine that you can place it within OnInspectorGUI as well.