Make the lowered non-gaps ground-plane invisible.

jsmerelDM · saran-t · commit ca66a3c08de3 · 2019-08-16T18:05:39.000+01:00
PiperOrigin-RevId: 263183194
diff --git a/dm_control/locomotion/arenas/corridors.py b/dm_control/locomotion/arenas/corridors.py
@@ -233,8 +233,9 @@ def regenerate(self, random_state):
     # Resize the entire corridor first.
     super(GapsCorridor, self).regenerate(random_state)
 
-    # Move the clear ground plane down.
+    # Move the ground plane down and make it invisible.
     self._ground_plane.pos = [self._current_corridor_length / 2, 0, -10]
+    self._ground_plane.rgba = [0, 0, 0, 0]
 
     # Clear the existing platform pieces.
     self._ground_body.geom.clear()
