Some common questions can be answered here:


I get a numeric error message on startup and Zephyr cannot be activated, what can I do?


Make sure that you are connected to the internet when activating your product and that the time and date on your system are correct. If you are using a trial key, please remember to activate it within 14 days of generation.


Zephyr can't write on hard disk, what can I do?


Make sure that no other software is preventing Zephyr to access the file system. In any case, you may specific an arbitrary temporary directory from the options menu.



Can I install 3DF Zephyr on more than one computer with one license?


You can uninstall and install 3DF Zephyr as many times and on as many computers as you need. The only requirement is that there can be only one simultaneously installed copy of Zephyr on your computers. If your license allows you more than one installation, than that limitation applies.


I'm experiencing problems/crashes with 3DF Zephyr. What should I do?


3DF Zephyr is a complex software, so it's hard to tell without further information. Post on the forums or send us an email, describing your problem and don't forget to attach the logs!


How do I use the developer console?


Please consider that this feature is for support only, things will break if not used correctly. The console uses LUA 5.3.1 but no external dependencies are needed.


Which is the difference between Constraints and Control points?


Let's think about an aerial capture where you have both coordinates taken by a GPS system on drone and some coordinates on the ground taken with a total station for instance.


After you have placed your points in Zephyr, you can choose which points must be the constraints, namely the points you are confident (of their accuracy) the most, and which points will be taken into account as simple references.


The first group will be the points taken on ground with the total station since their accuracy is definitely higher than GPS coordinates taken by the GPS system on drone, that represent the second group.


How can I ignore GPS data before performing my 3D reconstruction?


Simply click on Tools > Option > Application and disable "Allow Structure from Motion to use GPS information from cameras" option.


Which is the difference between structured objects and unstructured objects?


An object (photogrammetric clouds or scans) can be named "structured" when it includes the origin's point of its element (laser scanner devices rather than pictures). Native laser scanning file formats usually include the origin's point as well as other formats such as the E57 one. Other formats such as the .las one never provide the origin's point.