Added a new World class and made Viewport inherit from it.

scene/main/viewport.h

@@ -1,5 +1,6 @@
 #ifndef VIEWPORT_H
 #define VIEWPORT_H
+
 /*************************************************************************/
 /*  viewport.h                                                           */
 /*************************************************************************/
@@ -30,6 +31,7 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
 /*************************************************************************/
 
+#include "world.h"
 #include "core/math/transform_2d.h"
 #include "scene/main/node.h"
 #include "scene/resources/texture.h"
@@ -87,8 +89,8 @@ public:
 	~ViewportTexture();
 };
 
-class Viewport : public Node {
+class Viewport : public World {
-	GDCLASS(Viewport, Node);
+	GDCLASS(Viewport, World);
 
 public:
 	enum UpdateMode {

scene/main/world.cpp

@@ -0,0 +1,12 @@
+#include "world.h"
+
+World::World() {
+}
+World::~World() {
+}
+
+void World::_notification(int p_what) {
+}
+
+void World::_bind_methods() {
+}

scene/main/world.h

@@ -0,0 +1,19 @@
+#ifndef WORLD_H
+#define WORLD_H
+
+#include "node.h"
+
+class World : public Node {
+	GDCLASS(World, Node);
+
+public:
+	World();
+	~World();
+
+protected:
+	void _notification(int p_what);
+
+	static void _bind_methods();
+};
+
+#endif

scene/register_scene_types.cpp

@@ -133,6 +133,7 @@
 #include "scene/main/resource_preloader.h"
 #include "scene/main/scene_tree.h"
 #include "scene/main/timer.h"
+#include "scene/main/world.h"
 #include "scene/main/viewport.h"
 #include "scene/resources/audio_stream_sample.h"
 #include "scene/resources/bit_map.h"
@@ -277,6 +278,7 @@ void register_scene_types() {
 	ClassDB::register_class<Node>();
 	ClassDB::register_virtual_class<InstancePlaceholder>();
 
+	ClassDB::register_class<World>();
 	ClassDB::register_class<Viewport>();
 	ClassDB::register_class<ViewportTexture>();
 	ClassDB::register_class<HTTPRequest>();

scene/resources/environment_3d.h

@@ -1,5 +1,6 @@
-#ifndef ENVIRONMENT_H
+#ifndef ENVIRONMENT_3D_H
-#define ENVIRONMENT_H
+#define ENVIRONMENT_3D_H
+
 /*************************************************************************/
 /*  environment.h                                                        */
 /*************************************************************************/
@@ -418,4 +419,4 @@ VARIANT_ENUM_CAST(Environment3D::DOFBlurQuality)
 VARIANT_ENUM_CAST(Environment3D::SSAOQuality)
 VARIANT_ENUM_CAST(Environment3D::SSAOBlur)
 
-#endif // ENVIRONMENT_H
+#endif // ENVIRONMENT_3D_H

scene/resources/world_3d.h

@@ -87,4 +87,4 @@ public:
 	~World3D();
 };
 
-#endif // WORLD_H
+#endif // WORLD_3D_H