Learn the Difference: Point Distance (Resolution) vs. Accuracy

:bulb:If you’re unsure about the difference between point distance (resolution) and accuracy when 3D scanning, this quick guide is for you. Both factors impact your scan quality, but in different ways.

Point Distance is the distance between individual points in a 3D point cloud. A smaller point distance means there are more points, leading to higher resolution and more detail in the model. While resolution impacts detail, it does not affect accuracy.

Accuracy is how closely the 3D model created by a 3D scanner matches the object’s actual shape, size, and features. MetroX’s metrology-grade accuracy of 0.03 mm produces a model that closely matches the object’s true dimensions.


---- Created on MetroX by @Hellpanzer

Point Distance vs. Accuracy

Point distance affects detail, whereas accuracy defines model quality. A high point distance with low accuracy yields detailed but inaccurate models, while high accuracy with low point distance gives less detail but higher accuracy.

Which Should You Choose?

For tasks like reverse engineering or quality control, accuracy is essential. The scan doesn’t require the finest detail but must match the object’s size and shape.


----Created on MetroX 3D Scanner by @Ispanico97

On the other hand, point distance is crucial for 3D modelers creating realistic digital replicas, such as heritage preservation, design, and CGI.


----Created on MINI 2 3D Scanner by @dfodaro

Key Takeaway

Point distance impacts detail, while accuracy ensures the model aligns with real dimensions. Understanding how they work together will help you choose the right settings and scanner for your needs.

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I would like to add to this post that the accuracy is provided by the hardware itself and can’t be changed.

Just because you use smaller or bigger point distance in fusion of the points don’t mean you affect the volume of the accuracy , just the resolution of the surface.

For that reason scanning a coffee mug and fuse it at 0.03 mm or 0.1 mm will not change anything regarding the volume and will not make it any better.
Choice the fusing settings regarding of the surface details . You can measure the smallest detail on the model surface and use it as a guide for your fusing settings.

Never use Point Cloud simplifier if the volume accuracy is important.
Use the simplifier after final meshing to reduce the model size .

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