主要是编辑地势的凹凸，在初始状态下地面的大小为10000平方米，基准平面为xoy平面，摄像机在西南50米上空鸟瞰坐标系原点位置。鸟瞰位置可由用户任意指定。-Is editor of the convex-concave terrain, the ground state in the initial size of 10,000 square meters, the base plane to plane xoy, cameras over 50 meters in the south-west