in robosumo/envs/agents.py [0:0]
def set_euler(self, euler):
"""Set euler angles the agent; any element can be None."""
qpos = self._env.data.qpos.ravel().copy()
start = self.qpos_start_idx
if euler[0]: qpos[start + 4] = euler[0]
if euler[1]: qpos[start + 5] = euler[1]
if euler[2]: qpos[start + 6] = euler[2]
qvel = self._env.data.qvel.ravel()
self._env.set_state(qpos, qvel)