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Question by walkerb · Dec 28, 2011 at 03:36 AM · inheritancegizmosondrawgizmos

OnDrawGizmos for parent and child class

Hey all --

So I have a parent class which draws to the editor window on OnDrawGizmos(), which is great. However, I have a child of that parent class which wants to draw the same stuff as the parent on OnDrawGizmos(), plus a bit more info. So, I want to do something like

 class Child : Base
 {
    void OnDrawGizmos()
    {
       //do stuff
       base.OnDrawGizmos();
    }
 }

but this doesn't work! Visual Studio warns me that 'Parent.OnDrawGizmos() is inaccessible due to its protection level' and Unity gives me an internal compiler error, "System.InvalidOperationException: Method 'Child.OnDrawGizmos' does not have a method body" (which it clearly has). So... what's happening here?

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Answer by Rod-Green · Dec 28, 2011 at 05:50 AM

parent class should be..

 class ParentClass : MonoBehaviour
 {
 
     public virtual void OnDrawGizmos()
     {
         //parent gizmo rendering
     }
 }

the child should be

 public class ChildClass : ParentClass
 {
     public override void OnDrawGizmos()
     {
         base.OnDrawGizmos();
         //child gizmo rendering
     }
 }
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avatar image walkerb · Dec 29, 2011 at 08:04 PM 0
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Oh, durr -- I wasn't thinking about Unity finding functions via reflection and thought that OnDrawGizmos had to be a private non-virtual function since that seemed to be the default way it was declared. Thanks!

avatar image apomarinov1 · Feb 17, 2014 at 06:17 PM 0
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thank you, that helped sove my problem too!

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