Yes, always measure from the center of the AprilTags. You'll want to use these particular AprilTags, which have the centerpoint circled for you: dotproduct3d.com/targets
It can be as accurate as 1-5 mm, even without reference constraints (that's what we're seeing on the scene shown here!). However, given the many variables of handheld scanning (scene size, scene type, measurement length, user skill, scan trajectory, etc.), this definitely cannot be guaranteed universally. It's also important to clarify that local measurments (close range) will always be much more accurate than global measurements (long range, i.e. across multiple rooms). For example, in larger scale scans (entire large apartments, houses, large outdoor scenes) without reference constraints, errors of several inches (5-10+ cm) are possible when measuring across the entire scene, but local point-to-point measurements will always be much more accurate than that (typically more in line with the 1-5 mm that we're seeing here). In the end, it depends on the scene structure, device condition, scan trajectory, and many other factors, so it's hard to predict exactly. This is why reference constraints are the best way to guarantee your results (especially for larger scans), but the data can be very accurate even without constraints (especially for smaller scans).
Is it possible to get selected item in 3d models in stead of the whole room be the 3d item?
Yes, you may select any area of interest and Crop out the rest.
@@DotProduct3D is there any training provided?
@@ocibala Training is available for purchase: www.dot3dstore.com/products/training/1758665000028533017
add sensor to small drone?
Do you measure from the center of the apriltags? Not so relevant when the apriltags are on the walls. But what if they are on the floor?
Yes, always measure from the center of the AprilTags. You'll want to use these particular AprilTags, which have the centerpoint circled for you: dotproduct3d.com/targets
How accurate can you be with the iPhone / iPad devices (and no reference constraint)?
It can be as accurate as 1-5 mm, even without reference constraints (that's what we're seeing on the scene shown here!). However, given the many variables of handheld scanning (scene size, scene type, measurement length, user skill, scan trajectory, etc.), this definitely cannot be guaranteed universally.
It's also important to clarify that local measurments (close range) will always be much more accurate than global measurements (long range, i.e. across multiple rooms). For example, in larger scale scans (entire large apartments, houses, large outdoor scenes) without reference constraints, errors of several inches (5-10+ cm) are possible when measuring across the entire scene, but local point-to-point measurements will always be much more accurate than that (typically more in line with the 1-5 mm that we're seeing here).
In the end, it depends on the scene structure, device condition, scan trajectory, and many other factors, so it's hard to predict exactly. This is why reference constraints are the best way to guarantee your results (especially for larger scans), but the data can be very accurate even without constraints (especially for smaller scans).
Pls make the Video in german
Learn English, its universal