Based on the ImageCPRMapper example, get a screenshot of the cross section of the blood vessel at a central point

Web vtk.js
9

Now the plane can display the image, but the plane normal vector “normals” of my center point calculates the wrong value such as [0,-0,0]. How to calculate the plane normal vector of the center point? And how should the camera’s angle of view be calculated (renderer.getActiveCamera().elevation(angle)), so that it can look at the section of the center point