Any tips to make object transparent at the the center?

Hi, I deleted my first answer because I did not read “from every angle but I’m having trouble. When I rotate the camera it doesn’t look as good.”

This is an interesting question, the problem is that the light has different incidental angles as you turn the camera and changes the reflections on the tubes surface. I have done various experiments with little luck the closest I got was this:

For this I lowered the fresnel IOR far enough so that only the silhouette was shown from all angles.
This unfortunately gets rid of the nice plastic-like roughness.
So I tried to add some by mixing the bottom nodes (very slightly.)

The other problem that occurred was that from the back angle the tube disappears (dark side of the moon!), so I added another light opposite to the first one that gives a rim light on the back side. In the screen shot both lights are lighting the tube.

I know it is probably not exactly what you want but I thought I would post it in case you were curious about why I deleted my first post!

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