The Dot3D software tracks the real-world enviornment around you during scanning so it can know where you are in your scan at all times. To do this, it uses geometry in your scene to try and determine where you are based on pre-recognized features.
The loss of tracking can be related to a number of things, but the most common cause is a lack of distinct geometry in the field of view of your camera while scanning. If your 3D camera is trained on an empty area without any distinct features, Dot3D may lose track of your position in the scene, and require relocalization. This issue can also be caused by being too far away from what you're trying to scan, or too close.
To avoid these issues, a number of best practices should be used while scanning.
- Try to stay at an optimal distance from what your scanning. This distance can vary depending on what sensor your using. for iOS, you should be around 1-3 meters away from your target.
- Try not to scan large empty areas. 3D scanning software struggles with maintaining its known position if it has an empty scene.
- Make sure the area your scanning is lit, allowing the camera to operate in full capacity.
- If you need to scan something specific up close, approach it and then move away before scanning as normal, so you keep a good distance for as much as possible of the scan.
- Avoid overly fast or jerky movements while scanning. Going slow and keeping your camera stable helps ensure good tracking in your scan.
These materials may help you: