Please contact for any question you may have! Since version 5.0, the old "3DF Zephyr Pro" and "3DF Zephyr Aerial" versions have been merged into one single version, called "3DF Zephyr". the action you described, to pick the distance in 3D, is by nature not accurate and won't allow you to measure the accuracy of the rescaling operation (as you will do it only on two points, and thus, you won't be able to compare it to other control distances and calculate the residuals) and is generally used where accuracy is not a big problem (e.g.3DF Zephyr is the complete photogrammetry software solution. by using a total station) then you can also use that information to drive the reconstruction in the SfM stage, which will act and potentially change/aid the camera calibration If you have the 3D coordinate of your control points (e.g. Note that scaling using control distances is a rigid scaling, so you will not change any camera position at all. Tutorial on control points and distances is available here : This is the preferred way and the most accurate way using control distances, available in zephyr Pro and Aerial only. Then, add them as control distances, and use the scale world using control distances function. the height of a door) and pick those points in 2D from the images to create the control points in zephyr. the first one is to place control points in your scene (which can be with markers you measured, or any other known distance in the scene, e.g. What you described is rescaling via control distances.
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