Why am I getting "empty mesh"?
This usually happens when the system has been calibrated for a certain range and you are scanning out of that range.
This can also happen if the projector and cameras are desychronized. This can be checked by looking at the raw images from the scan. To get to the raw images, right-click on a thumbnail and choose Open folder.
You must also make sure that you have calibrated your system correctly.
Finally, if your project folder contains non-English characters, you can get an "Empty mesh" message. You can fix this by going into the project folders and changing the name back to English. (Numbers are fine.)