Fix see through glass
Fixes #287
Fixes #286. Issue was caused by a typo.
Merge pull request #289 from duncanspumpkin/fix_288

Fix see through glass
Merge pull request #290 from duncanspumpkin/fix_287

Fixes #287
Merge pull request #291 from duncanspumpkin/fix_286

Fixes #286. Issue was caused by a typo.