One question with example 28-voxel-basic
I tested example 28 and it worked well. However, I want to create 2 cubes in the same workspace. I add one more object and image, and I called them object2 and image2. I can see 2 cubes, but my first cube become transparent in the view when the second cube serve as its background. Look like the enclosed photo drive.google.com/open?id=1wrCAeqTKLhfVJFzutNHxJlr4qtGLxho5 (orange one is the first). Anyone have idea to fix it? I don't want any transparent.