Label image volume is not visible outside of intensity image bounds in `view`

[tbirdso]

Overview

When viewing two binary images with view(image1, label_image=image2), only the first image volume is displayed. The second image volume can be inferred as intersections on the label surface.

Expected Behavior

Two volumes of different colors are visible in the scene.

Observed Behavior

One volume is visible as a 3D boundary. The intersection of the other volume is implied as discoloration on the first volume surface.

Minimum Reproducible Example

arr1 = np.zeros([25,25,25], dtype=np.uint8)
arr1[1:15,1:15,1:15] = 1
image1 = itk.image_view_from_array(arr1)

arr2 = np.zeros([25,25,25], dtype=np.uint8)
arr2[:20,:5,:5] = 1
image2 = itk.image_view_from_array(arr2)

itkwidgets.view(image1, label_image=image2)

Intersection in red:

cc @PaulHax

[thewtex]

In this case the bounding box visualization would be helpful.

[ManooshSamiei]

In itk 5.3.0 this intersection for label image is not shown at all. Do you have any suggestions?