Invisible meshes collision and tooltip
Unlike in vanilla, invisible meshes are taken into account for collision and highlighting (i.e. tooltip display when in activation range).
One consequence is that the player collides with sound activators. These activators have a tied script for playing sound and are invisible (the associated meshes is completely transparent).
Aside of that, it was possible in vanilla to build one-way passages using walls oriented in a manner that the player sees their transparent face at first and their textured face when he/she goes back.
http://img248.imageshack.us/img248/8329/screenshot004ym.jpg - Andrano's ancestral tomb http://ompldr.org/vaGc1bA/sound-1.jpg - Mzahnch http://ompldr.org/vaGc1ag/sound-2.jpg - Dagoth ur
(RM-550 from redmine: created on 2013-02-13 by Emanuel Guével, , closed on 2013-03-09 by scrawl .)