Index: code/model/modelinterp.cpp
===================================================================
--- code/model/modelinterp.cpp	(revision 10819)
+++ code/model/modelinterp.cpp	(working copy)
@@ -2331,7 +2331,7 @@
 
 			// fade them in the nebula as well
 			if (The_mission.flags & MISSION_FLAG_FULLNEB) {
-				vm_vec_rotate(&npnt, &gpt->pnt, orient);
+				vm_vec_unrotate(&npnt, &gpt->pnt, orient);
 				vm_vec_add2(&npnt, pos);
 
 				fog_int = (1.0f - (neb2_get_fog_intensity(&npnt)));