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You can publish the surface (or arbitrary geometry) as a couple of triangles using an rviz Marker triangle list http://wiki.ros.org/rviz/DisplayTypes/Marker#Triangle_List_.28TRIANGLE_LIST.3D11.29_.5B1.1.2B-.5D
This has some example python marker publishing code https://answers.ros.org/question/373802/minimal-working-example-for-rviz-marker-publishing/, the C++ isn't that different.