diff --git a/Source/smokeview/drawGeometry.c b/Source/smokeview/drawGeometry.c
index 55ffc019c..7fcee9f55 100644
--- a/Source/smokeview/drawGeometry.c
+++ b/Source/smokeview/drawGeometry.c
@@ -2586,67 +2586,53 @@ int CompareColorFaces(const void *arg1, const void *arg2){
 
 /* ------------------ ShowHideInternalFaces ------------------------ */
 
-void ShowHideInternalFaces(void){
-  int i;
-  int show;
+//***need to update
+void ShowHideInternalFaces(meshdata *meshi, int show){
+  int j;
 
-  show = GetInternalFaceShow();
-  for(i = 0;i < nmeshes;i++){
-    int j;
-    meshdata *meshi;
+  for(j = 0;j < meshi->nbptrs;j++){
+    facedata *facej;
 
-    meshi = meshinfo + i;
-    for(j = 0;j < meshi->nbptrs;j++){
-      facedata *facej;
-      blockagedata *bc;
+    facej = meshi->faceinfo + 6 * j;
+    facej->hidden = 0; facej++;
+    facej->hidden = 0; facej++;
+    facej->hidden = 0; facej++;
+    facej->hidden = 0; facej++;
+    facej->hidden = 0; facej++;
+    facej->hidden = 0; facej++;
+  }
+  if(show == 1)return;
+  for(j = 0;j < meshi->nbptrs;j++){
+    facedata *facej;
+    blockagedata *bc;
+
+    bc = meshi->blockageinfoptrs[j];
+    facej = meshi->faceinfo + 6 * j;
 
-      bc = meshi->blockageinfoptrs[j];
-      facej = meshi->faceinfo + 6 * j;
-
-/* down y  2
-     up x  1
-     up y  3
-   down x 0
-   down z 4
-     up z 5
-     */
 #define EPS 0.01
 //down y
-      facej->hidden = 0;
-//    if(bc->inside_domain[2]==1)facej->hidden = 1;
-      if(show==0 && bc->xyzEXACT[2] > ybar0FDS + EPS)facej->hidden = 1;
-      facej++;
+    if(bc->xyzEXACT[2] > ybar0FDS + EPS)facej->hidden = 1;
+    facej++;
 
 // up x
-      facej->hidden = 0;
-//      if(bc->inside_domain[1] == 1)facej->hidden = 1;
-      if(show == 0 && bc->xyzEXACT[1] < xbarFDS - EPS)facej->hidden = 1;
-      facej++;
+    if(bc->xyzEXACT[1] < xbarFDS - EPS)facej->hidden = 1;
+    facej++;
 
 //up y
-      facej->hidden = 0;
- //     if(bc->inside_domain[3] == 1)facej->hidden = 1;
-      if(show == 0 && bc->xyzEXACT[3] < ybarFDS - EPS)facej->hidden = 1;
-      facej++;
+    if(bc->xyzEXACT[3] < ybarFDS - EPS)facej->hidden = 1;
+    facej++;
 
 // down x
-      facej->hidden = 0;
-//      if(bc->inside_domain[0] == 1)facej->hidden = 1;
-      if(show == 0 && bc->xyzEXACT[0] > xbar0FDS + EPS)facej->hidden = 1;
-      facej++;
+    if(bc->xyzEXACT[0] > xbar0FDS + EPS)facej->hidden = 1;
+    facej++;
 
 // down z
-      facej->hidden = 0;
-//      if(bc->inside_domain[4] == 1)facej->hidden = 1;
-      if(show == 0 && bc->xyzEXACT[4] > zbar0FDS + EPS)facej->hidden = 1;
-      facej++;
+    if(bc->xyzEXACT[4] > zbar0FDS + EPS)facej->hidden = 1;
+    facej++;
 
 // up z
-      facej->hidden = 0;
-//      if(bc->inside_domain[5] == 1)facej->hidden = 1;
-      if(show == 0 && bc->xyzEXACT[5] < zbarFDS - EPS)facej->hidden = 1;
-      facej++;
-    }
+    if(bc->xyzEXACT[5] < zbarFDS - EPS)facej->hidden = 1;
+    facej++;
   }
 }
 
@@ -2654,12 +2640,12 @@ void ShowHideInternalFaces(void){
 
 int IsVentVisible(ventdata *vi){
   if(boundary_loaded == 1){
-    if(vi->isExterior == DOWN_X && vis_boundary_type[LEFTwall]  == 0)return 1;
-    if(vi->isExterior == UP_X   && vis_boundary_type[RIGHTwall] == 0)return 1;
-    if(vi->isExterior == DOWN_Y && vis_boundary_type[FRONTwall] == 0)return 1;
-    if(vi->isExterior == UP_Y   && vis_boundary_type[BACKwall]  == 0)return 1;
-    if(vi->isExterior == DOWN_Z && vis_boundary_type[DOWNwall]  == 0)return 1;
-    if(vi->isExterior == UP_Z   && vis_boundary_type[UPwall]    == 0)return 1;
+    if(vi->wall_type == LEFTwall  && vis_boundary_type[LEFTwall]  == 0)return 1;
+    if(vi->wall_type == RIGHTwall && vis_boundary_type[RIGHTwall] == 0)return 1;
+    if(vi->wall_type == FRONTwall && vis_boundary_type[FRONTwall] == 0)return 1;
+    if(vi->wall_type == BACKwall  && vis_boundary_type[BACKwall]  == 0)return 1;
+    if(vi->wall_type == DOWNwall  && vis_boundary_type[DOWNwall]  == 0)return 1;
+    if(vi->wall_type == UPwall    && vis_boundary_type[UPwall]    == 0)return 1;
     return 0;
   }
   return 1;
@@ -2686,6 +2672,10 @@ void UpdateFaceLists(void){
   if(opengldefined==1){
     glutPostRedisplay();
   }
+
+  int show;
+  show = GetInternalFaceShow();
+  
   // if we are not showing boundary files then don't try to hide blockages
   for(i=0;i<nmeshes;i++){
     meshdata *meshi;
@@ -2705,7 +2695,7 @@ void UpdateFaceLists(void){
     patchfilenum=meshi->patchfilenum;
     patchi=NULL;
     if(showplot3d == 0 && patchfilenum>=0 && patchfilenum<npatchinfo)patchi = patchinfo + patchfilenum;
-    ShowHideInternalFaces();
+    ShowHideInternalFaces(meshi, show);
 
     n_normals_single=0;
     n_normals_double=0;
diff --git a/Source/smokeview/glui_bounds.cpp b/Source/smokeview/glui_bounds.cpp
index 12e1bfaee..210a295bc 100644
--- a/Source/smokeview/glui_bounds.cpp
+++ b/Source/smokeview/glui_bounds.cpp
@@ -5117,8 +5117,8 @@ extern "C" void GLUIBoundsSetup(int main_window){
 
     PANEL_boundary_exterior_data = glui_bounds->add_panel_to_panel(ROLLOUT_boundary_settings,"exterior data");
     CHECKBOX_show_all_exterior_patch_data   = glui_bounds->add_checkbox_to_panel(PANEL_boundary_exterior_data, _("Show all"),  &show_all_exterior_patch_data,  SHOW_ALL_EXTERIOR_PATCH_DATA, BoundBoundCB);
-    CHECKBOX_show_exterior_walls[FRONTwall] = glui_bounds->add_checkbox_to_panel(PANEL_boundary_exterior_data, _("front wall"), vis_boundary_type + FRONTwall, SHOW_EXTERIOR_PATCH_DATA,     BoundBoundCB);
     CHECKBOX_show_exterior_walls[LEFTwall]  = glui_bounds->add_checkbox_to_panel(PANEL_boundary_exterior_data, _("left wall"),  vis_boundary_type + LEFTwall,  SHOW_EXTERIOR_PATCH_DATA,     BoundBoundCB);
+    CHECKBOX_show_exterior_walls[FRONTwall] = glui_bounds->add_checkbox_to_panel(PANEL_boundary_exterior_data, _("front wall"), vis_boundary_type + FRONTwall, SHOW_EXTERIOR_PATCH_DATA,     BoundBoundCB);
     CHECKBOX_show_exterior_walls[DOWNwall]  = glui_bounds->add_checkbox_to_panel(PANEL_boundary_exterior_data, _("lower wall"), vis_boundary_type + DOWNwall,  SHOW_EXTERIOR_PATCH_DATA,     BoundBoundCB);
     glui_bounds->add_column_to_panel(PANEL_boundary_exterior_data, false);
 
diff --git a/Source/smokeview/menus.c b/Source/smokeview/menus.c
index 15b20c182..a5d229b20 100644
--- a/Source/smokeview/menus.c
+++ b/Source/smokeview/menus.c
@@ -9162,18 +9162,30 @@ static int menu_count=0;
       glutAddMenuEntry(_("#Hide all"),  HIDE_EXTERIOR_WALL_MENU);
     }
     UpdateShowExtPatch(show_all_exterior_patch_data, hide_all_exterior_patch_data);
-    if(IsBoundaryType(FRONTwall) == 1 && vis_boundary_type[FRONTwall] == 1)glutAddMenuEntry(_("*Front"), FRONTwallmenu);
-    if(IsBoundaryType(FRONTwall) == 1 && vis_boundary_type[FRONTwall] == 0)glutAddMenuEntry(_("Front"), FRONTwallmenu);
-    if(IsBoundaryType(BACKwall) == 1 && vis_boundary_type[BACKwall] == 1)glutAddMenuEntry(_("*Back"), BACKwallmenu);
-    if(IsBoundaryType(BACKwall) == 1 && vis_boundary_type[BACKwall] == 0)glutAddMenuEntry(_("Back"), BACKwallmenu);
-    if(IsBoundaryType(LEFTwall) == 1 && vis_boundary_type[LEFTwall] == 1)glutAddMenuEntry(_("*Left"), LEFTwallmenu);
-    if(IsBoundaryType(LEFTwall) == 1 && vis_boundary_type[LEFTwall] == 0)glutAddMenuEntry(_("Left"), LEFTwallmenu);
-    if(IsBoundaryType(RIGHTwall) == 1 && vis_boundary_type[RIGHTwall] == 1)glutAddMenuEntry(_("*Right"), RIGHTwallmenu);
-    if(IsBoundaryType(RIGHTwall) == 1 && vis_boundary_type[RIGHTwall] == 0)glutAddMenuEntry(_("Right"), RIGHTwallmenu);
-    if(IsBoundaryType(UPwall) == 1 && vis_boundary_type[UPwall] == 1)glutAddMenuEntry(_("*Up"), UPwallmenu);
-    if(IsBoundaryType(UPwall) == 1 && vis_boundary_type[UPwall] == 0)glutAddMenuEntry(_("Up"), UPwallmenu);
-    if(IsBoundaryType(DOWNwall) == 1 && vis_boundary_type[DOWNwall] == 1)glutAddMenuEntry(_("*Down"), DOWNwallmenu);
-    if(IsBoundaryType(DOWNwall) == 1 && vis_boundary_type[DOWNwall] == 0)glutAddMenuEntry(_("Down"), DOWNwallmenu);
+    if(IsBoundaryType(FRONTwall) == 1){
+      if(vis_boundary_type[FRONTwall] == 1)glutAddMenuEntry(_("*Front"), FRONTwallmenu);
+      if(vis_boundary_type[FRONTwall] == 0)glutAddMenuEntry(_("Front"), FRONTwallmenu);
+    }
+    if(IsBoundaryType(BACKwall) == 1){
+      if(vis_boundary_type[BACKwall] == 1)glutAddMenuEntry(_("*Back"), BACKwallmenu);
+      if(vis_boundary_type[BACKwall] == 0)glutAddMenuEntry(_("Back"), BACKwallmenu);
+    }
+    if(IsBoundaryType(LEFTwall) == 1){
+      if(vis_boundary_type[LEFTwall] == 1)glutAddMenuEntry(_("*Left"), LEFTwallmenu);
+      if(vis_boundary_type[LEFTwall] == 0)glutAddMenuEntry(_("Left"), LEFTwallmenu);
+    }
+    if(IsBoundaryType(RIGHTwall) == 1){
+      if(vis_boundary_type[RIGHTwall] == 1)glutAddMenuEntry(_("*Right"), RIGHTwallmenu);
+      if(vis_boundary_type[RIGHTwall] == 0)glutAddMenuEntry(_("Right"), RIGHTwallmenu);
+    }
+    if(IsBoundaryType(UPwall) == 1){
+      if(vis_boundary_type[UPwall] == 1)glutAddMenuEntry(_("*Up"), UPwallmenu);
+      if(vis_boundary_type[UPwall] == 0)glutAddMenuEntry(_("Up"), UPwallmenu);
+    }
+    if(IsBoundaryType(DOWNwall) == 1){
+      if(vis_boundary_type[DOWNwall] == 1)glutAddMenuEntry(_("*Down"), DOWNwallmenu);
+      if(vis_boundary_type[DOWNwall] == 0)glutAddMenuEntry(_("Down"), DOWNwallmenu);
+    }
 
     CREATEMENU(showpatchmenu,ShowBoundaryMenu);
     if(npatchloaded>0){
diff --git a/Source/smokeview/readsmv.c b/Source/smokeview/readsmv.c
index bb4b25f39..fd2fbedcd 100644
--- a/Source/smokeview/readsmv.c
+++ b/Source/smokeview/readsmv.c
@@ -7352,46 +7352,46 @@ void SetExternalVents(void){
       float xyz[3];
 
       vj = meshi->ventinfo + j;
-      vj->isExterior = -1;
+      vj->wall_type = INTERIORwall;
       switch(vj->dir){
       case UP_X:
-        xyz[0] = vj->xvent1_orig + VENT_EPS;
+        xyz[0] =  vj->xvent1_orig - VENT_EPS;
         xyz[1] = (vj->yvent1_orig + vj->yvent2_orig) / 2.0;
         xyz[2] = (vj->zvent1_orig + vj->zvent2_orig) / 2.0;
-        if(InExterior(xyz)==1)vj->isExterior = UP_X;
+        if(InExterior(xyz)==1)vj->wall_type = LEFTwall;
         break;
       case DOWN_X:
-        xyz[0] = vj->xvent1_orig  - VENT_EPS;
+        xyz[0] =  vj->xvent1_orig + VENT_EPS;
         xyz[1] = (vj->yvent1_orig + vj->yvent2_orig) / 2.0;
         xyz[2] = (vj->zvent1_orig + vj->zvent2_orig) / 2.0;
-        if(InExterior(xyz) == 1)vj->isExterior = DOWN_X;
+        if(InExterior(xyz) == 1)vj->wall_type = RIGHTwall;
         break;
       case UP_Y:
-        xyz[0] = (vj->xvent1_orig - vj->xvent2_orig) / 2.0;
-        xyz[1] = vj->yvent1_orig - VENT_EPS;
+        xyz[0] = (vj->xvent1_orig + vj->xvent2_orig) / 2.0;
+        xyz[1] =  vj->yvent1_orig - VENT_EPS;
         xyz[2] = (vj->zvent1_orig + vj->zvent2_orig) / 2.0;
-        if(InExterior(xyz)==1)vj->isExterior = UP_Y;
+        if(InExterior(xyz)==1)vj->wall_type = FRONTwall;
         break;
       case DOWN_Y:
-        xyz[0] = (vj->xvent1_orig - vj->xvent2_orig) / 2.0;
-        xyz[1] = vj->yvent1_orig + VENT_EPS;
+        xyz[0] = (vj->xvent1_orig + vj->xvent2_orig) / 2.0;
+        xyz[1] = vj->yvent1_orig  + VENT_EPS;
         xyz[2] = (vj->zvent1_orig + vj->zvent2_orig) / 2.0;
-        if(InExterior(xyz)==1)vj->isExterior = DOWN_Y;
+        if(InExterior(xyz)==1)vj->wall_type = BACKwall;
         break;
       case UP_Z:
         xyz[0] = (vj->xvent1_orig + vj->xvent2_orig) / 2.0;
         xyz[1] = (vj->yvent1_orig + vj->yvent2_orig) / 2.0;
-        xyz[2] = vj->zvent1_orig + VENT_EPS;
-        if(InExterior(xyz)==1)vj->isExterior = UP_Z;
+        xyz[2] = vj->zvent1_orig  - VENT_EPS;
+        if(InExterior(xyz)==1)vj->wall_type = DOWNwall;
         break;
       case DOWN_Z:
-        xyz[0] = (vj->xvent1_orig - vj->xvent2_orig) / 2.0;
+        xyz[0] = (vj->xvent1_orig + vj->xvent2_orig) / 2.0;
         xyz[1] = (vj->yvent1_orig + vj->yvent2_orig) / 2.0;
-        xyz[2] = vj->zvent1_orig + VENT_EPS;
-        if(InExterior(xyz)==1)vj->isExterior = DOWN_Z;
+        xyz[2] = vj->zvent1_orig  + VENT_EPS;
+        if(InExterior(xyz)==1)vj->wall_type = UPwall;
         break;
       default:
-        vj->isExterior = -1;
+        vj->wall_type = INTERIORwall;
       }
     }
   }
@@ -11092,7 +11092,7 @@ typedef struct {
         vi->usecolorindex=0;
         vi->nshowtime=0;
         vi->isOpenvent=0;
-        vi->isExterior = -1;
+        vi->wall_type = INTERIORwall;
         vi->isMirrorvent = 0;
         vi->hideboundary=0;
         vi->surf[0]=vent_surfacedefault;
diff --git a/Source/smokeview/smv_geometry.c b/Source/smokeview/smv_geometry.c
index 622d338bc..44b13df7f 100644
--- a/Source/smokeview/smv_geometry.c
+++ b/Source/smokeview/smv_geometry.c
@@ -475,12 +475,9 @@ int InExterior(float *xyz){
   x = xyz[0];
   y = xyz[1];
   z = xyz[2];
-  if(x < xbar0FDS - MESH_EPS)return 1;
-  if(x > xbarFDS  + MESH_EPS)return 1;
-  if(y < ybar0FDS - MESH_EPS)return 1;
-  if(y > ybarFDS  + MESH_EPS)return 1;
-  if(z < zbar0FDS - MESH_EPS)return 1;
-  if(z > zbarFDS  + MESH_EPS)return 1;
+  if(x < xbar0FDS - MESH_EPS || x > xbarFDS  + MESH_EPS)return 1;
+  if(y < ybar0FDS - MESH_EPS || y > ybarFDS  + MESH_EPS)return 1;
+  if(z < zbar0FDS - MESH_EPS || z > zbarFDS  + MESH_EPS)return 1;
   for(i = 0;i < nmeshes;i++){
     meshdata *meshi;
 
diff --git a/Source/smokeview/structures.h b/Source/smokeview/structures.h
index f39211dd7..53aa6a174 100644
--- a/Source/smokeview/structures.h
+++ b/Source/smokeview/structures.h
@@ -401,7 +401,7 @@ typedef struct _ventdata {
   int dir,dir2,vent_id;
   int useventcolor;
   int isOpenvent, isMirrorvent;
-  int isExterior;
+  int wall_type;
   float xvent1_orig, xvent2_orig;
   float yvent1_orig, yvent2_orig;
   float zvent1_orig, zvent2_orig;