Modified 3d shader and terrain shader to fade to transparency instead of performing a fogging.
Modified 3d shader and terrain shader to fade to transparency instead of performing a fogging.

Former-commit-id: b1b61abd2ba941e5280a05c5ca2c16da424d8669
mattbucci/destruct-o,mattbucci/destruct-o,mattbucci/destruct-o,mattbucci/destruct-o,mattbucci/destruct-o,mattbucci/destruct-o,mattbucci/destruct-o