Legacy Documentation: Version 2018.1 (Go to current version)
LanguageEnglish
  • C#
  • JS

Script language

Select your preferred scripting language. All code snippets will be displayed in this language.

Editor.OnSceneGUI()

Suggest a change

Success!

Thank you for helping us improve the quality of Unity Documentation. Although we cannot accept all submissions, we do read each suggested change from our users and will make updates where applicable.

Close

Submission failed

For some reason your suggested change could not be submitted. Please <a>try again</a> in a few minutes. And thank you for taking the time to help us improve the quality of Unity Documentation.

Close

Cancel

Description

Enables the Editor to handle an event in the scene view.

In the OnSceneGUI you can do for example mesh editing, terrain painting or advanced gizmos. If Event.current.Use() is called the event will be "eaten" by the editor and not be used by the scene view itself.

In the following two scripts OnSceneGUI is used to draw lines between game objects. The first script shows how OnSceneGUI is used. In this script a game object is used as a parent. The position of the parent is obtained and then lines are draw from this to game objects stored in an array. The Handles.DrawLine function is used for this. The documentation for Handles.DrawLine has a very similar example.

#pragma strict
@CustomEditor(DrawLine)
public class DrawLineEditor extends Editor {
	// and a selection of added game objects
	function OnSceneGUI() {
		// get the chosen game object
		var t: DrawLine = target as DrawLine;
		if (t == null || t.GameObjects == null)return ;
		// grab the center of the parent
		var center: Vector3 = t.transform.position;
		// iterate over game objects added to the array...
		for (var i: int = 0; i < t.GameObjects.Length; i++) {
			// ... and draw a line between them
			if (t.GameObjects[i] != null)
				Handles.DrawLine(center, t.GameObjects[i].transform.position);
		}
	}
}
using UnityEngine;
using UnityEditor;

[CustomEditor( typeof( DrawLine ) )] public class DrawLineEditor : Editor { // draw lines between a chosen game object // and a selection of added game objects

void OnSceneGUI() { // get the chosen game object DrawLine t = target as DrawLine;

if( t == null || t.GameObjects == null ) return;

// grab the center of the parent Vector3 center = t.transform.position;

// iterate over game objects added to the array... for( int i = 0; i < t.GameObjects.Length; i++ ) { // ... and draw a line between them if( t.GameObjects[i] != null ) Handles.DrawLine( center, t.GameObjects[i].transform.position ); } } }

This script stores the array of game objects which will have a line drawn to them. This regular script is simply attached to a game object which is considered to be the starting point for all lines.

#pragma strict
@ExecuteInEditMode
public class DrawLine extends MonoBehaviour {
	public var GameObjects: GameObject[];
}
using UnityEngine;

[ExecuteInEditMode] public class DrawLine : MonoBehaviour { // an array of game objects which will have a // line drawn to in the scene editor public GameObject[] GameObjects; }

Did you find this page useful? Please give it a rating: