I don't know if you still need this but basically you need to load 2 spotlights: 1st will be the plain background (black in my case) and 2nd is your shoe sole (white shoe sole on the black background). Both files are .png but I assume you can use whatever you want. After images are loaded, you need image with the sole to be on top of the background image and then hit Snapshot 3D button on the spotlight menu (camera icon). And it should automatically create a model of your sole for you