Index: code/nebula/neb.cpp
===================================================================
--- code/nebula/neb.cpp	(revision 10814)
+++ code/nebula/neb.cpp	(working copy)
@@ -503,7 +503,7 @@
 }
 
 // should we not render this object because its obscured by the nebula?
-int neb_skip_opt = 1;
+int neb_skip_opt = 0;
 DCF(neb_skip, "Toggles culling of objects obscured by nebula")
 {
 	neb_skip_opt = !neb_skip_opt;

Index: code/graphics/gropengl.cpp
===================================================================
--- code/graphics/gropengl.cpp	(revision 10814)
+++ code/graphics/gropengl.cpp	(working copy)
@@ -650,27 +650,25 @@
 		return;
 	}
 	
-  	if (gr_screen.current_fog_mode != fog_mode) {
-	  	if (OGL_fogmode == 3) {
-			glFogf(GL_FOG_DISTANCE_MODE_NV, GL_EYE_RADIAL_NV);
-			glFogf(GL_FOG_COORDINATE_SOURCE, GL_FRAGMENT_DEPTH);
-		}
-		// Um.. this is not the correct way to fog in software, probably doesn't matter though
-		else if ( (OGL_fogmode == 2) && Cmdline_nohtl ) {
-			glFogf(GL_FOG_COORDINATE_SOURCE_EXT, GL_FOG_COORDINATE_EXT);
-			fog_near *= fog_near;		// it's faster this way
-			fog_far *= fog_far;		
-		} else {
-			glFogf(GL_FOG_COORDINATE_SOURCE, GL_FRAGMENT_DEPTH);
-		}
+  	if (OGL_fogmode == 3) {
+		glFogf(GL_FOG_DISTANCE_MODE_NV, GL_EYE_RADIAL_NV);
+		glFogf(GL_FOG_COORDINATE_SOURCE, GL_FRAGMENT_DEPTH);
+	}
+	// Um.. this is not the correct way to fog in software, probably doesn't matter though
+	else if ( (OGL_fogmode == 2) && Cmdline_nohtl ) {
+		glFogf(GL_FOG_COORDINATE_SOURCE_EXT, GL_FOG_COORDINATE_EXT);
+		fog_near *= fog_near;		// it's faster this way
+		fog_far *= fog_far;		
+	} else {
+		glFogf(GL_FOG_COORDINATE_SOURCE, GL_FRAGMENT_DEPTH);
+	}
 
-		GL_state.Fog(GL_TRUE); 
-		glFogf(GL_FOG_MODE, GL_LINEAR);
-		glFogf(GL_FOG_START, fog_near);
-		glFogf(GL_FOG_END, fog_far);
+	GL_state.Fog(GL_TRUE); 
+	glFogf(GL_FOG_MODE, GL_LINEAR);
+	glFogf(GL_FOG_START, fog_near);
+	glFogf(GL_FOG_END, fog_far);
 
-		gr_screen.current_fog_mode = fog_mode;
-	}
+	gr_screen.current_fog_mode = fog_mode;
 	
 	if ( (gr_screen.current_fog_color.red != r) ||
 			(gr_screen.current_fog_color.green != g) ||
Index: code/object/objectsort.cpp
===================================================================
--- code/object/objectsort.cpp	(revision 10814)
+++ code/object/objectsort.cpp	(working copy)
@@ -307,7 +307,7 @@
 
 			// only reset fog if the fog mode has changed - since regenerating a fog table takes
 			// a bit of time
-			if((fog_near != gr_screen.fog_near) || (fog_far != gr_screen.fog_far)){
+			if((GR_FOGMODE_FOG != gr_screen.current_fog_mode) || (fog_near != gr_screen.fog_near) || (fog_far != gr_screen.fog_far)) {
 				gr_fog_set(GR_FOGMODE_FOG, gr_screen.current_fog_color.red, gr_screen.current_fog_color.green, gr_screen.current_fog_color.blue, fog_near, fog_far);
 			}
 

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)));