docs(VolumeMapper): Add vtkSliceHelper types

Author: DrewLazzeriKitware

Sources/Rendering/Core/VolumeMapper/index.d.ts

@@ -1,4 +1,4 @@
-import { Bounds, Range } from "../../../types";
+import { Bounds, Range, Vector3 } from "../../../types";
 import vtkAbstractMapper, { IAbstractMapperInitialValues } from "../AbstractMapper";
 
 export enum BlendMode {
@@ -160,12 +160,55 @@ export function extend(publicAPI: object, model: object, initialValues?: IVolume
  */
 export function newInstance(initialValues?: IVolumeMapperInitialValues): vtkVolumeMapper;
 
+/**
+ * Helper class to perform MPR.
+ */
+
+export interface vtkSliceHelper {
+  /**
+   * 
+   */
+   update(): void; 
+
+  /**
+   * Get the distance between clip planes
+   */
+   getThickness(): number;
+
+  /**
+   * Get the origin of the MPR
+   */
+   getOrigin(): Vector3;
+
+  /**
+   * Get the orientation of the MPR
+   */
+   getNormal(): Vector3;
+
+  /**
+   * Set the distance between clip planes
+   */
+   setThickness(thickness: number): void;
+
+  /**
+   * Set the origin of the MPR
+   */
+   setOrigin(origin: Vector3): void;
+
+  /**
+   * Set the orientation of the MPR
+   */
+   setNormal(origin: Vector3): void;
+
+}
+
 /** 
  * vtkVolumeMapper inherits from vtkMapper.
  * A volume mapper that performs ray casting on the GPU using fragment programs.
  */
 export declare const vtkVolumeMapper: {
 	newInstance: typeof newInstance,
 	extend: typeof extend,
+        vtkSliceHelper: vtkSliceHelper,
 };
 export default vtkVolumeMapper;