ScriptableWizard.OnDrawGizmos 当绘制Gizmos

// C#
// Creates a sphere where the gizmo is painted in the scene view.
//在场景视图gizmo被绘制的位置，创建一个球体
using UnityEngine;
using UnityEditor;

public class ScriptableWizardOnDrawGizmos : ScriptableWizard {

	public Vector3 spherePosition = Vector3.zero;
	public float sphereRadius = 1;

	[MenuItem ("Example/OnDrawGizmos example")]
	static void CreateWindow() {
		ScriptableWizard.DisplayWizard(
			"Create a Sphere",
			typeof(ScriptableWizardOnDrawGizmos),
			"Create!");
	}

	void OnWizardUpdate() {
		helpString =
			"Set the sphere position and the sphere radius to draw the gizmo in the scene view";
		if(sphereRadius > 0) {
			errorString = "";
			isValid = true;
		} else {
			errorString = "Radius has to be greater than 0";
			isValid = false;
		}
	}

	void OnDrawGizmos () {
		Gizmos.color = Color.red;
		Gizmos.DrawSphere (spherePosition, sphereRadius);
	}

	void OnWizardCreate() {
		GameObject createdSphere = GameObject.CreatePrimitive(PrimitiveType.Sphere);
		createdSphere.transform.position = spherePosition;
		createdSphere.transform.localScale = new Vector3(sphereRadius, sphereRadius, sphereRadius);
	}
}