Targeting: How to Reference Survey Control (xyz) Coordinates in Dot3D 5.0 & Up (iOS)

Targeting: How to Reference Survey Control Coordinates in Dot3D 5.0 & Up

1. Obtain a minimum of 3 AprilTag target coordinates (i.e. from survey instrument, measurement, reference model, another point cloud, etc.)
2. Set up a .txt target control file in the following format:
AprilTag #, x, y, z
AprilTag #, x, y, z
AprilTag #, x, y, z
(A sample control file in this format is attached.)
3. Open the unoptimized DP file in Dot3D.
4. Navigate to the "Targets" tab and select "Load Control File".
5. Check the units and Open/Import the .txt control file.
6. Press the new "Fit Control Targets" button (top left).
7. After fitting targets, now select "Optimize" from the top menu and leave the box checked to "Use constraints from targeting".
8. When you Save / Export / Share the file, make sure to check "Control Targets" as the Output Transform during the save/export dialog.

A Dot3D user tutorial that describes the steps in more detail:
https://medium.com/@KentaItakura/3d-scanning-with-iphone-lidar-using-dot3d-65445674c280