creating cities on non-flat terrain is possible using MojoWorld, with the MojoTree plugin, using 'mesh branches' elements to hold city-building meshes. one issue is that the placement of the trees is designed to be naturalistic and randomized, not rigidly in rows... there's a bit of a work-around for that, which requires access to the Pro UI to build function graphs to displace the child branches from the lying-down parent branches up or down to the surface of the planet itself.

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Check out my Elemental Hexagons deck, created with Photoshop, Bryce, MojoWorld, and Poser