diff --git a/src/c3nav/mapdata/render/engines/base3d.py b/src/c3nav/mapdata/render/engines/base3d.py
index 80089006..32c82cc0 100644
--- a/src/c3nav/mapdata/render/engines/base3d.py
+++ b/src/c3nav/mapdata/render/engines/base3d.py
@@ -18,9 +18,11 @@ class Base3DEngine(RenderEngine):
         self._current_group = None
         self.groups = OrderedDict()
         self.vertices = OrderedDict()
+        self.colors = OrderedDict()
 
         self.np_scale = np.array((self.scale, self.scale, self.scale))
         self.np_offset = np.array((-self.minx * self.scale, -self.miny * self.scale, 0))
+
         if center:
             self.np_offset -= np.array(((self.maxx - self.minx) * self.scale / 2,
                                         (self.maxy - self.miny) * self.scale / 2,
@@ -37,6 +39,7 @@ class Base3DEngine(RenderEngine):
             if key not in self.vertices:
                 self.groups[self._current_group].append(key)
             self.vertices.setdefault(key, []).append(self._place_geometry(geometry))
+            self.colors.setdefault(key, self.color_to_rgb(fill.color))
 
     @staticmethod
     def _append_to_vertices(vertices, append=None):
diff --git a/src/c3nav/mapdata/render/engines/openscad.py b/src/c3nav/mapdata/render/engines/openscad.py
index c0a6bf9c..464d2c89 100644
--- a/src/c3nav/mapdata/render/engines/openscad.py
+++ b/src/c3nav/mapdata/render/engines/openscad.py
@@ -34,7 +34,8 @@ class OpenSCADEngine(Base3DEngine):
                   b'}\n\n')
         for group, subgroups in self.groups.items():
             result += (b'module ' + group.replace('-', 'minus').encode() + b'() {\n' +
-                       b'\n'.join((b'  %s();' % subgroup.replace('-', 'minus').encode())
+                       b'\n'.join((b'  color([%.2f, %.2f, %.2f]) %s();' %
+                                   (*self.colors[subgroup][:3], subgroup.replace('-', 'minus').encode()))
                                   for subgroup in subgroups) + b'\n' +
                        b'}\n')
         result += b'\n'
diff --git a/src/c3nav/mapdata/render/renderer.py b/src/c3nav/mapdata/render/renderer.py
index 43724c43..ec4ea88c 100644
--- a/src/c3nav/mapdata/render/renderer.py
+++ b/src/c3nav/mapdata/render/renderer.py
@@ -111,7 +111,7 @@ class MapRenderer:
                     scale = (bottom - min_altitude) / int(0.7 * 1000)
                     offset = min_altitude - bottom * scale
                     engine.add_geometry(altitudearea.geometry.fit(scale=scale, offset=offset).filter(top=False),
-                                        fill=FillAttribs('#aaaaaa'), category='ground')
+                                        fill=FillAttribs('#eeeeee'), category='ground')
 
             # render altitude areas in default ground color and add ground colors to each one afterwards
             # shadows are directly calculated and added by the engine