Add this attribute to a method to get a notification just before building the scene.
// C# example: // Automatically creates a game object with a primitive mesh renderer and appropriate collider. using UnityEngine; using UnityEditor; using UnityEditor.Callbacks; public class MyScenePostprocessor { [PostProcessScene] public static void OnPostprocessScene() { GameObject cube = GameObject.CreatePrimitive(PrimitiveType.Cube); cube.transform.position = Vector3(0, 0.5, 0); } }