diff --git a/Sources/Interaction/Manipulators/MouseRangeManipulator/index.d.ts b/Sources/Interaction/Manipulators/MouseRangeManipulator/index.d.ts
index 3f8c8a1879c..c3b4ed9510b 100644
--- a/Sources/Interaction/Manipulators/MouseRangeManipulator/index.d.ts
+++ b/Sources/Interaction/Manipulators/MouseRangeManipulator/index.d.ts
@@ -1,11 +1,14 @@
 import vtkCompositeMouseManipulator, {
   ICompositeMouseManipulatorInitialValues,
 } from '../../../Interaction/Manipulators/CompositeMouseManipulator';
+import { vtkObject } from '../../../interfaces';
 
 export interface IMouseRangeManipulatorInitialValues
   extends ICompositeMouseManipulatorInitialValues {}
 
-export interface vtkMouseRangeManipulator extends vtkCompositeMouseManipulator {
+export interface vtkMouseRangeManipulator
+  extends vtkCompositeMouseManipulator,
+    vtkObject {
   setHorizontalListener(
     min: number,
     max: number,
diff --git a/Sources/Interaction/Widgets/OrientationMarkerWidget/Constants.js b/Sources/Interaction/Widgets/OrientationMarkerWidget/Constants.js
index 75fe538e6c1..238344cfe26 100644
--- a/Sources/Interaction/Widgets/OrientationMarkerWidget/Constants.js
+++ b/Sources/Interaction/Widgets/OrientationMarkerWidget/Constants.js
@@ -1,4 +1,4 @@
-const Corners = {
+export const Corners = {
   TOP_LEFT: 'TOP_LEFT',
   TOP_RIGHT: 'TOP_RIGHT',
   BOTTOM_LEFT: 'BOTTOM_LEFT',
diff --git a/Sources/Interaction/Widgets/OrientationMarkerWidget/index.d.ts b/Sources/Interaction/Widgets/OrientationMarkerWidget/index.d.ts
index de7d4d37748..c28fe6e0125 100644
--- a/Sources/Interaction/Widgets/OrientationMarkerWidget/index.d.ts
+++ b/Sources/Interaction/Widgets/OrientationMarkerWidget/index.d.ts
@@ -1,6 +1,5 @@
 import { vtkObject } from "../../../interfaces";
-import vtkAnnotatedCubeActor from "../../../Rendering/Core/AnnotatedCubeActor";
-import vtkAxesActor from "../../../Rendering/Core/AxesActor";
+import vtkActor from "../../../Rendering/Core/Actor";
 import vtkRenderer from "../../../Rendering/Core/Renderer";
 import vtkRenderWindowInteractor from "../../../Rendering/Core/RenderWindowInteractor";
 import { Nullable } from "../../../types";
@@ -11,7 +10,7 @@ import { Corners } from "./Constants";
  * 
  */
 export interface IOrientationMarkerWidgetInitialValues {
-	actor?: vtkAnnotatedCubeActor | vtkAxesActor,
+	actor?: vtkActor,
 	interactor?: vtkRenderWindowInteractor,
 	parentRenderer?: vtkRenderer,
 	viewportCorner?: Corners,
@@ -39,7 +38,7 @@ export interface vtkOrientationMarkerWidget extends vtkObject {
 	/**
 	 * 
 	 */
-	getActor(): vtkAnnotatedCubeActor | vtkAxesActor;
+	getActor(): vtkActor;
 
 	/**
 	 * Gets the parent renderer, if any.
@@ -85,9 +84,9 @@ export interface vtkOrientationMarkerWidget extends vtkObject {
 	
 	/**
 	 * Get the actor associated with the widget.
-	 * @param {vtkAnnotatedCubeActor | vtkAxesActor} actor The actor instance.
+	 * @param {vtkActor} actor The actor instance.
 	 */
-	setActor(actor: vtkAnnotatedCubeActor | vtkAxesActor): void;
+	setActor(actor: vtkActor): void;
 
 	/**
 	 * Sets the parent renderer
diff --git a/Sources/Rendering/Core/RenderWindowInteractor/index.d.ts b/Sources/Rendering/Core/RenderWindowInteractor/index.d.ts
index b0ebbe49cf9..5404690aef4 100755
--- a/Sources/Rendering/Core/RenderWindowInteractor/index.d.ts
+++ b/Sources/Rendering/Core/RenderWindowInteractor/index.d.ts
@@ -396,6 +396,11 @@ export interface vtkRenderWindowInteractor extends vtkObject {
 	 */
 	invokeEndInteractionEvent(callData: IRenderWindowInteractorEvent): void;
 
+	/**
+	 *
+	 */
+	invokeRenderEvent(): void;
+
 	/**
 	 *
 	 * @param cb The callback to be called
@@ -659,6 +664,13 @@ export interface vtkRenderWindowInteractor extends vtkObject {
 	 */
 	onEndInteractionEvent(cb: InteractorEventCallback, priority?: number): Readonly<vtkSubscription>;
 
+	/**
+	 *
+	 * @param {Function} cb The callback to be called.
+	 * @param {Number} [priority] The priority of the event.
+	 */
+	onRenderEvent(cb: () => void, priority?: number): Readonly<vtkSubscription>;
+
 	/**
 	 *
 	 * @param args
diff --git a/Sources/Rendering/Core/VolumeProperty/index.d.ts b/Sources/Rendering/Core/VolumeProperty/index.d.ts
index c563c1484b0..7b59809974d 100755
--- a/Sources/Rendering/Core/VolumeProperty/index.d.ts
+++ b/Sources/Rendering/Core/VolumeProperty/index.d.ts
@@ -279,14 +279,14 @@ export interface vtkVolumeProperty extends vtkObject {
 	 * @param {Number} index 
 	 * @param {vtkColorTransferFunction} func 
 	 */
-	setRGBTransferFunction(index: number, func: vtkColorTransferFunction): boolean;
+	setRGBTransferFunction(index: number, func?: vtkColorTransferFunction | null): boolean;
 
 	/**
 	 * Set the scalar opacity of a volume to a transfer function
 	 * @param {Number} index 
 	 * @param {vtkPiecewiseFunction} func 
 	 */
-	setScalarOpacity(index: number, func: vtkPiecewiseFunction): boolean;
+	setScalarOpacity(index: number, func?: vtkPiecewiseFunction | null): boolean;
 
 	/**
 	 * Set the scalar component weights.
diff --git a/Sources/Rendering/OpenGL/RenderWindow/index.d.ts b/Sources/Rendering/OpenGL/RenderWindow/index.d.ts
index c89987f1428..c63b8c812bb 100644
--- a/Sources/Rendering/OpenGL/RenderWindow/index.d.ts
+++ b/Sources/Rendering/OpenGL/RenderWindow/index.d.ts
@@ -80,7 +80,7 @@ export interface vtkOpenGLRenderWindow extends vtkOpenGLRenderWindowBase {
 	 *
 	 * @param {HTMLElement} el The container element.
 	 */
-	setContainer(el: HTMLElement): void;
+	setContainer(el: Nullable<HTMLElement>): void;
 
 	/**
 	 * Get the container element.