how to visualize quadrangle in rviz

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I am looking for a proper way to visualize quadrangles in rviz. The quadrangles are from a dynamically updated map representing a terrain environment.

The closest display type I can find in rviz is the 2d map, but it is limited to 2d flat ground while in my case the elevation of cells has to be considered; another close approach is to visualize the vertexes of quadrangle, but no color filling of the quadrangles can be achieved.

thanks for any advices clark