General workflow of transfer a site model from Infraworks to Revit. Diagram.  You can also check out the old tutorial of site modeling with Revit or GIS.

A demo of using IFW to capture a site from Atlanta, Georgia, export FBX into Rhino to create contour lines. Then import into Revit to create a topo surface. Also, correct UV mapping in 3dsmax, and then export again into FBX and Rhino.

Note: 

If you do not feel comfortable with 3dsMax, you can flip the image in Photoshop, then save it as a different image, then point to the new texture image in Rhino material.