diff --git a/src/c3nav/mapdata/render/data.py b/src/c3nav/mapdata/render/data.py
index 4b4e8f9d..73a3c52b 100644
--- a/src/c3nav/mapdata/render/data.py
+++ b/src/c3nav/mapdata/render/data.py
@@ -74,6 +74,12 @@ class HybridGeometry:
                               add_faces={crop_id: tuple((faces*scale+offset) for faces in self.faces)
                                          for crop_id, faces in self.add_faces})
 
+    def filter(self, **kwargs):
+        return HybridGeometry(geom=self.geom, crop_ids=self.crop_ids,
+                              faces=tuple(mesh.filter(**kwargs) for mesh in self.faces),
+                              add_faces={crop_id: tuple(mesh.filter(**kwargs) for mesh in faces)
+                                         for crop_id, faces in self.add_faces.items()})
+
     @property
     def is_empty(self):
         return not self.faces and not any(self.add_faces.values())
@@ -333,6 +339,11 @@ class Mesh:
     def __add__(self, other):
         return Mesh(self.top+other, self.sides+other, self.bottom+other)
 
+    def filter(self, top=True, sides=True, bottom=True):
+        return Mesh(top=self.top if top else None,
+                    sides=self.sides if sides else None,
+                    bottom=self.bottom if bottom else None)
+
 
 class LevelGeometries:
     def __init__(self):
diff --git a/src/c3nav/mapdata/render/renderer.py b/src/c3nav/mapdata/render/renderer.py
index 47f64fa9..bc7b9265 100644
--- a/src/c3nav/mapdata/render/renderer.py
+++ b/src/c3nav/mapdata/render/renderer.py
@@ -108,14 +108,16 @@ class MapRenderer:
                     bottom = float(altitudearea.altitude) - 0.7
                     scale = (bottom - min_altitude) / 0.7
                     offset = min_altitude - bottom * scale
-                    engine.add_geometry(altitudearea.geometry.fit(scale=scale, offset=offset),
+                    engine.add_geometry(altitudearea.geometry.fit(scale=scale, offset=offset).filter(top=False),
                                         fill=FillAttribs('#aaaaaa'))
 
             # render altitude areas in default ground color and add ground colors to each one afterwards
             # shadows are directly calculated and added by the engine
             for altitudearea in geoms.altitudeareas:
-                engine.add_geometry(altitudearea.geometry.difference(crop_areas),
-                                    altitude=altitudearea.altitude, fill=FillAttribs('#eeeeee'))
+                geometry = altitudearea.geometry.difference(crop_areas)
+                if not self.full_levels and engine.is_3d:
+                    geometry = geometry.filter(bottom=False)
+                engine.add_geometry(geometry, altitude=altitudearea.altitude, fill=FillAttribs('#eeeeee'))
 
                 for color, areas in altitudearea.colors.items():
                     # only select ground colors if their access restriction is unlocked