multiagent/scenarios/simple_adversary.py [121:129]:
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    def observation(self, agent, world):
        # get positions of all entities in this agent's reference frame
        entity_pos = []
        for entity in world.landmarks:
            entity_pos.append(entity.state.p_pos - agent.state.p_pos)
        # entity colors
        entity_color = []
        for entity in world.landmarks:
            entity_color.append(entity.color)
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multiagent/scenarios/simple_push.py [76:84]:
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    def observation(self, agent, world):
        # get positions of all entities in this agent's reference frame
        entity_pos = []
        for entity in world.landmarks:  # world.entities:
            entity_pos.append(entity.state.p_pos - agent.state.p_pos)
        # entity colors
        entity_color = []
        for entity in world.landmarks:  # world.entities:
            entity_color.append(entity.color)
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