EditorApplication.OpenSceneAdditive

static function OpenSceneAdditive (path : String) : void

Description

Opens the scene at path additively.

All paths are relative to the project folder. Like: "Assets/MyScenes/MyScene.unity"

// Simple script that lets you load the contents of a selected scene 
// to your current scene.

@MenuItem("Example/Load Scene Additive")
static function Apply () {
var strScenePath : String = AssetDatabase.GetAssetPath(Selection.activeObject);
if (strScenePath == null || !strScenePath.Contains(".unity")) {
EditorUtility.DisplayDialog("Select Scene", "You Must Select a Scene!", "Ok");
EditorApplication.Beep();
return;
}
Debug.Log("Opening " + strScenePath + " additively");
EditorApplication.OpenSceneAdditive(strScenePath);
}