"Backside" of polygons not displaying

```
You can see here:

If you look at the "bottom" of the vase there, it is rendering; but if you look
through the "top" or "opening" of the vase, you can see the bottom of the base
is not rendering.

Is there a way to make the "backside" of the polygons the same as the
"frontside" or render them as black or something?
```

Original issue reported on code.google.com by `geoffgol...@gmail.com` on 4 Aug 2014 at 5:00

Reproduce the vase behavior described in the issue, focusing on the missing base visible through the top opening. Trace the polygon rendering path and determine how backside faces are handled. Done means the backside behavior matches the requested result and the vase base renders through the opening; the payload names no file or test to run.

Written by the indexing model from the issue text.