crystal:: 3D mode works from the Rug menu, and linked to from its menu

crystal.cpp

@@ -858,6 +858,12 @@ void show() {
   dialog::addBreak(50);
   dialog::addBoolItem("view coordinates in the cheat mode", view_coordinates, 'v');
   dialog::add_action([]() { view_coordinates = !view_coordinates; });
+  if(geometry == gCrystal) {
+    dialog::addBoolItem("3D display", rug::rugged, 'r');
+    dialog::add_action([]() { pushScreen(rug::show); });
+    }
+  else
+    dialog::addBreak(100);
   dialog::addBack();
   dialog::display();
   }

hyper.h

@@ -4154,6 +4154,7 @@ namespace crystal {
   int dist_alt(cell *c);
   int dist_relative(cell *c);
   void show();
+  void init_rotation();
   }
 
 hyperpoint get_warp_corner(cell *c, int cid);

rug.cpp

@@ -1396,6 +1396,13 @@ void init_model() {
   qvalid = 0; dt = 0; queueiter = 0;
   err_zero_current = err_zero;
   
+  if(geometry == gCrystal && surface::sh == surface::dsNone) {
+    surface::sh = surface::dsCrystal;
+    crystal::init_rotation();
+    good_shape = true;
+    return;
+    }
+  
   try {
     buildRug();
     while(good_shape && subdivide_further()) subdivide();