Editor-only circular contour around prefab instances

Question

I have a prefab with radius setting, which programatically controls circular area with some stuff. I want instances of this prefab to display a circle with this radius in editor for convenience. Instead of radius setting I can attach circle collider to get visual border and then read its radius at runtime, but this seems code smell (I will need to programmatically remove/disable it etc), and resource waste. Are there some good practices to implement things like this?

Answer 1

Found an answer myself. That's actually quite easy. There is some "Gizmos" stuff for things like that, and it's possible to just overload OnDrawGizmos (in a script attached to prefab) and use built-in function to draw circle in editor:

private void OnDrawGizmos()
{
    UnityEditor.Handles.color = Color.yellow;
    UnityEditor.Handles.DrawWireDisc(transform.position, Vector3.back, Radius);
}