Here is a surface of revolution:
Here is a cylindrical form, using Einstein as the original photograph:
You can also do flat objects, as shown below.
Here is a spherical form, also new in V4:
Again, with a simple surface of revolution you can even create Celtic eggs...!
Here is a flatter Celtic example:
Here is a design for a lithophane, note the open bottom, if you'll excuse the expression:
Another cylindrical example:
Finally you can also make hollow polygonal extrusions. here is a hexagon extruded to make a hollow hexagonal STL or DXF file:
Try the demo with your own images, download by clicking on the button below (Windows only):