How would you simulate an outdoor environment with the Gazebo simulator? e.g. I would need to provide a texture map of the ground, sky and background, so that the robot sees more than just a flat color shade. The [tutorials](http://gazebosim.org/tutorials?cat=build_world) explain how to populate a simple world with objects, but they all seem to assume I'm simulating an indoor environment with no background or special lighting conditions. I can't find how to texture the ground/sky/background to mimic an outdoor environment.
I'm thinking about participating in an autonomous vehicle competition, and I'm trying to find a way to simulate the course so I can easily test how my "virtual" robot reacts to camera input that roughly mimics input from the real course.
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