The funtion "slice view" can't work

[dollPrincess]

The funtion "slice view" can't work. Whatever I tried, it still did not respond, and the windows are always empty.
I has read the relevant contents in the manual as illustrated below:
"
17.2.3 Slice View
To access the Slice View, click the Slice View button on the Image Toolbar. This view shows slices of the image in each of the cardinal directions, along with a 3D render of the image which shows the corresponding location of each of the slices.
Below each of the slices, the direction of the slice is displayed along with the index of the slice in that direction and a slider. You can change which slice is displayed by either editing the slice index number, dragging the slider, or hovering over the slice and scrolling with your mouse wheel. As a given slice is moved, the corresponding slice on the 3D render will move with it.
"

But it is no use!
Whatever I tried, it still did not respond, and the windows are always empty.

what I want to ask:

1. Is this function fully completed?

2. How to use it?

3. In fact, I want to figure out that the model "box in box" is hollow and has a box hollow out of it, not a box generated inside the box shell unite, right?

4. (all the models illustrated as below)
   When I look at the code and display of the models of those entities, they all just generate the visible surface. Are any of the entities inside the invisible part of the model actually generated?
   If not, I don't think it's appropriate, your code is well written, so for what reason do you not consider actually generating the entities of the invisible interior of the model? Is there an alternative function?
   If so, can I ask where it is? m_node doesn't take the interior into account, huh?