Feat/3dcursor

packages/core/src/RenderingEngine/BaseVolumeViewport.ts

@@ -1520,36 +1520,50 @@ abstract class BaseVolumeViewport extends Viewport {
     vtkCamera.setIsPerformingCoordinateTransformation?.(true);
 
     const renderer = this.getRenderer();
+    const displayCoords = this.getVTKDisplayCoords(canvasPos);
     const offscreenMultiRenderWindow =
       this.getRenderingEngine().offscreenMultiRenderWindow;
     const openGLRenderWindow =
       offscreenMultiRenderWindow.getOpenGLRenderWindow();
-    const size = openGLRenderWindow.getSize();
+    const worldCoord = openGLRenderWindow.displayToWorld(
+      displayCoords[0],
+      displayCoords[1],
+      displayCoords[2],
+      renderer
+    );
+
+    vtkCamera.setIsPerformingCoordinateTransformation?.(false);
+
+    return [worldCoord[0], worldCoord[1], worldCoord[2]];
+  };
+
+  /**
+   * Returns the VTK.js display coordinates of the given `canvasPos` projected onto the
+   * `Viewport`'s `vtkCamera`'s focal point and the direction of projection.
+   * @param canvasPos - The position in canvas coordinates.
+   * @returns The corresponding display coordinates.
+   *
+   */
+  public getVTKDisplayCoords = (canvasPos: Point2): Point3 => {
     const devicePixelRatio = window.devicePixelRatio || 1;
     const canvasPosWithDPR = [
       canvasPos[0] * devicePixelRatio,
       canvasPos[1] * devicePixelRatio,
     ];
+    const offscreenMultiRenderWindow =
+      this.getRenderingEngine().offscreenMultiRenderWindow;
+    const openGLRenderWindow =
+      offscreenMultiRenderWindow.getOpenGLRenderWindow();
+    const size = openGLRenderWindow.getSize();
     const displayCoord = [
       canvasPosWithDPR[0] + this.sx,
       canvasPosWithDPR[1] + this.sy,
     ];
 
     // The y axis display coordinates are inverted with respect to canvas coords
     displayCoord[1] = size[1] - displayCoord[1];
-
-    const worldCoord = openGLRenderWindow.displayToWorld(
-      displayCoord[0],
-      displayCoord[1],
-      0,
-      renderer
-    );
-
-    vtkCamera.setIsPerformingCoordinateTransformation?.(false);
-
-    return [worldCoord[0], worldCoord[1], worldCoord[2]];
+    return [displayCoord[0], displayCoord[1], 0];
   };
-
   /**
    * Returns the canvas coordinates of the given `worldPos`
    * projected onto the `Viewport`'s `canvas`.