![]() Or you may use 3DF Zephyr Free as long as you want to learn the basics of 3DF Zephyr before moving on to other more complete editions. You may also use 3DF Zephyr Free to process small datasets while your primary license is working. So although 3DF Zephyr Free can not process more than 50 pictures (while 3DF Zephyr Lite can process up to 500 pictures and Pro/Aerial have no image number limitation) it is still a great viewer and is perfect for everyone who wants to start learning photogrammetry without using time limited trials. zep files generated with 3DF Zephyr Lite, Pro or Aerial. This includes sharing this version with your customers, who may want to be able to open your. You can use 3DF Zephyr Free for any personal use. 3DF Zephyr the free photogrammetry software for everyone. ![]() 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 Free is the newest addition to the 3DF Zephyr Family: sharing the same technology of its siblings, this version is completetly free for personal use. 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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