Lots of 3D improvements:

-Object Manipulator Gizmo keeps proper scale in all windows and projections, (configurable on settings too).
-Manipulator gizmos for other objects (camera, shapes, etc) massively improved and bug-fixed.
-Manipulator gizmos are different for edited object and other objects.
-Properly highlight manipulator gizmo handles when hovered.
-Fixed bugs in fragment program when using more than 1 light together.
-Reload png/jpg files automatically in editor if edited externally.
-Added 4-stages Parallel Split Shadow Mapping, to improve shadow quality in large scenarios
-Added PCF13 to improve smoothness of shadow borders
-General optimization of directional light shadow mapping for Orthogonal,PSM and PSSM.
-Fixed normal mapping when importing DAE files, works nicely now.

tools/editor/plugins/spatial_editor_plugin.h

@@ -44,8 +44,13 @@ class SpatialEditorGizmos;
 class SpatialEditorGizmo : public SpatialGizmo {
 
 	OBJ_TYPE(SpatialEditorGizmo,SpatialGizmo);
+
+	bool selected;
 public:
 
+	void set_selected(bool p_selected) { selected=p_selected; }
+	bool is_selected() const { return selected; }
+
 	virtual String get_handle_name(int p_idx) const;
 	virtual Variant get_handle_value(int p_idx) const;
 	virtual void set_handle(int p_idx,Camera *p_camera, const Point2& p_point);
@@ -74,8 +79,13 @@ class SpatialEditorViewport : public Control {
 		VIEW_ENVIRONMENT,
 		VIEW_ORTHOGONAL
 	};
+	enum {
+		GIZMO_BASE_LAYER=25
+	};
 
+	int index;
 	void _menu_option(int p_option);
+	Size2 prev_size;
 
 	EditorNode *editor;
 	EditorSelection *editor_selection;
@@ -90,6 +100,7 @@ class SpatialEditorViewport : public Control {
 	Camera *camera;
 	bool transforming;
 	bool orthogonal;
+	float gizmo_scale;
 
 	void _compute_edit(const Point2& p_point);
 	void _clear_selected();
@@ -174,6 +185,9 @@ class SpatialEditorViewport : public Control {
 		Cursor() { x_rot=y_rot=0; distance=4; region_select=false; }
 	} cursor;
 
+	RID move_gizmo_instance[3], rotate_gizmo_instance[3];
+
+
 	String last_message;
 	String message;
 	float message_time;
@@ -193,19 +207,24 @@ class SpatialEditorViewport : public Control {
 
 	void _preview_exited_scene();
 	void _toggle_camera_preview(bool);
+	void _init_gizmo_instance(int p_idx);
+
+
 protected:
 
 	void _notification(int p_what);
 	static void _bind_methods();
 public:
 
+	void update_transform_gizmo_view();
+
 	void set_can_preview(Camera* p_preview);
 	void set_state(const Dictionary& p_state);
 	Dictionary get_state() const;
 
 
 
-	SpatialEditorViewport(SpatialEditor *p_spatial_editor,EditorNode *p_editor);
+	SpatialEditorViewport(SpatialEditor *p_spatial_editor,EditorNode *p_editor,int p_index);
 };
 
 
@@ -275,11 +294,12 @@ private:
 	bool grid_enabled;
 
 	Ref<Mesh> move_gizmo[3], rotate_gizmo[3];
-	RID move_gizmo_instance[3], rotate_gizmo_instance[3];
 	Ref<FixedMaterial> gizmo_color[3];
 	Ref<FixedMaterial> gizmo_hl;
 
 
+	int over_gizmo_handle;
+
 
 
 	Ref<Mesh> selection_box;
@@ -365,8 +385,6 @@ private:
 
 	HBoxContainer *hbc_menu;
 
-	void _update_transform_gizmo_view();
-
 //
 //
 	void _generate_selection_box();
@@ -386,10 +404,13 @@ private:
 
 	List<EditorPlugin*> gizmo_plugins;
 
+	Spatial *selected;
+
 	void _request_gizmo(Object* p_obj);
 
 	static SpatialEditor *singleton;
 
+	void _node_removed(Node* p_node);
 	SpatialEditorGizmos *gizmos;
 	SpatialEditor();
 
@@ -422,6 +443,9 @@ public:
 	float get_rotate_snap() const { return snap_rotate->get_text().to_double(); }
 	float get_scale_snap() const { return snap_scale->get_text().to_double(); }
 
+	Ref<Mesh> get_move_gizmo(int idx) const { return move_gizmo[idx]; }
+	Ref<Mesh> get_rotate_gizmo(int idx) const { return rotate_gizmo[idx]; }
+
 	void update_transform_gizmo();
 
 	void select_gizmo_hilight_axis(int p_axis);
@@ -442,6 +466,11 @@ public:
 	VSplitContainer *get_shader_split();
 	HSplitContainer *get_palette_split();
 
+	Spatial *get_selected() { return selected; }
+
+	int get_over_gizmo_handle() const { return over_gizmo_handle; }
+	void set_over_gizmo_handle(int idx) { over_gizmo_handle=idx; }
+
 	void set_can_preview(Camera* p_preview);
 
 	Camera *get_camera() { return NULL; }