Kitware
diff --git a/‎Sources/Rendering/Core/RenderWindowInteractor/index.d.ts
Lines changed: 23 additions & 0 deletions b/‎Sources/Rendering/Core/RenderWindowInteractor/index.d.ts
Lines changed: 23 additions & 0 deletions
diff --git a/‎Sources/Rendering/Core/RenderWindowInteractor/index.js
Lines changed: 9 additions & 1 deletion b/‎Sources/Rendering/Core/RenderWindowInteractor/index.js
Lines changed: 9 additions & 1 deletion
@@ -41,6 +41,7 @@ declare enum handledEvents {
   'Interaction',
   'EndInteraction',
   'AnimationFrameRateUpdate',
+  'RendererChange',
 }
 
 /**
@@ -412,6 +413,12 @@ export interface vtkRenderWindowInteractor extends vtkObject {
    */
   invokeEndInteractionEvent(callData: IRenderWindowInteractorEvent): void;
 
+  /**
+   *
+   * @param {IRenderWindowInteractorEvent} callData
+   */
+  invokeRendererChangeEvent(callData: IRenderWindowInteractorEvent): void;
+
   /**
    *
    */
@@ -794,6 +801,16 @@ export interface vtkRenderWindowInteractor extends vtkObject {
     priority?: number
   ): Readonly<vtkSubscription>;
 
+  /**
+   *
+   * @param {InteractorEventCallback} cb The callback to be called.
+   * @param {Number} [priority] The priority of the event.
+   */
+  onRendererChangeEvent(
+    cb: InteractorEventCallback,
+    priority?: number
+  ): Readonly<vtkSubscription>;
+
   /**
    *
    * @param {Function} cb The callback to be called.
@@ -971,6 +988,12 @@ export interface vtkRenderWindowInteractor extends vtkObject {
    */
   rotateEvent(args: any): any;
 
+  /**
+   *
+   * @param args
+   */
+  rendererChangeEvent(): any;
+
   /**
    * Add an HTMLElement as the new container for the interactor.
    * All events will be bound to this new container.
 
@@ -68,6 +68,7 @@ const handledEvents = [
   'Interaction',
   'EndInteraction',
   'AnimationFrameRateUpdate',
+  'RendererChange',
 ];
 
 function preventDefault(event) {
@@ -163,7 +164,11 @@ function vtkRenderWindowInteractor(publicAPI, model) {
 
   function updateCurrentRenderer(x, y) {
     if (!model._forcedRenderer) {
+      const oldRenderer = model.currentRenderer;
       model.currentRenderer = publicAPI.findPokedRenderer(x, y);
+      if (oldRenderer !== model.currentRenderer) {
+        publicAPI.rendererChangeEvent();
+      }
     }
   }
 
@@ -1188,7 +1193,10 @@ function vtkRenderWindowInteractor(publicAPI, model) {
 
   publicAPI.setCurrentRenderer = (r) => {
     model._forcedRenderer = !!r;
-    model.currentRenderer = r;
+    if (r !== model.currentRenderer) {
+      model.currentRenderer = r;
+      publicAPI.rendererChangeEvent();
+    }
   };
 
   publicAPI.setContainer = (container) => {