How are world coordinates represented in the shader of VTK?

Since I want to do some lighting calculations in the Shader, I need the world coordinates of the light source, camera, and vertex, but when I modify the Shader, it seems that I can only get the view coordinates.Is there any way to get these world coordinates?
I looked at some examples and couldn’t find the answer.
Thank you.

Now I have sent the world coordinates of the light source and the camera to Shader. Now I want to know how to get the world coordinates of the fragment. Is there any way to get them?