Height Mapped Polyhedra in OpenScad

I want to do height mapping in OpenScad. The easiest way to do it is to generate little cubes for each offset. That's a good start, but I wanted more. What I really want is the ability to layout a polyhedron mesh use a height map to alter the vertices of that mesh.

This thing is just the latest incarnation of the library. With it, you can do the following:

display_mesh_height([32,32], [2,2], heightmap=checker_image);

That is, specify a size in millimeters for the mesh [32,32], then