Add nearly all gym environments using pybullet together with the latest tf model from the roboschool model zoo.

examples/pybullet/gym/envs/scene_stadium.py

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+import os
+from .scene_abstract import Scene
+import pybullet as p
+
+class StadiumScene(Scene):
+	zero_at_running_strip_start_line = True   # if False, center of coordinates (0,0,0) will be at the middle of the stadium
+	stadium_halflen   = 105*0.25	# FOOBALL_FIELD_HALFLEN
+	stadium_halfwidth = 50*0.25	 # FOOBALL_FIELD_HALFWID
+
+	def episode_restart(self):
+		Scene.episode_restart(self)   # contains cpp_world.clean_everything()
+		# stadium_pose = cpp_household.Pose()
+		# if self.zero_at_running_strip_start_line:
+		#	 stadium_pose.set_xyz(27, 21, 0)  # see RUN_STARTLINE, RUN_RAD constants
+		self.stadium = p.loadSDF(os.path.join(os.path.dirname(__file__), "other_assets", "stadium.sdf"))
+		self.ground_plane_mjcf = p.loadMJCF(os.path.join(os.path.dirname(__file__), "mujoco_assets", "ground_plane.xml"))
+
+class SinglePlayerStadiumScene(StadiumScene):
+	"This scene created by environment, to work in a way as if there was no concept of scene visible to user."
+	multiplayer = False
+
+class MultiplayerStadiumScene(StadiumScene):
+	multiplayer = True
+	players_count = 3
+	def actor_introduce(self, robot):
+		StadiumScene.actor_introduce(self, robot)
+		i = robot.player_n - 1  # 0 1 2 => -1 0 +1
+		robot.move_robot(0, i, 0)