how to get raw point from CPR

Web vtk.js
,
1

i created CPR view follows the ImageCPRMapper example,
and bind the onLeftButtonPress event to the interactor to get the coordinates of the click,
I used openGLRenderWindow’s displayToWorld method to transform the coordinates,
but this coordinate is not positioned correctly on the view of the original graph.

How do I calculate the points of the world coordinates on the original view from the points of the world coordinates on the CPR view?

thanks!