Manual

So how to choose your settings? Higher values for octree depth results in more
detailed results. However, if you have a noisy scan, the software may not be able to
distinguish what is a good point from a stray point and may attempt to treat them
equally. This is where the samples per node value can help since it will limit or
expand the number of points being considered.
A good method is to determine the level of detail you want by setting the octree
depth that gives you the shape you want and then fine-tuning the surface
smoothness with the samples per node value. A high samples per node value will
deliver a smoother surface while a low samples per node value will deliver a more
detailed, but potentially rougher, surface.
For more information along with images and examples, check out this explanation
from the Computer Science Institute at http://vr.tu-freiberg.de/scivi/?page_id=365
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