Generally arm may be difficult to scan for an inexperienced users, mostly due to small surface and round geometry. However making a complete scan of the arm is easier than it seems, as long as you follow these simple rules.
For scanning straight arm:
1) For optimal pose, person, whose arm is being scanned need to position in as shown on the picture.
Such position provides Eva with enough surface while leaving enough space between arm and torso to be scanned completely with no blind spots.
2) While scanning make sure to always keep torso in the field of view, and move around the person to make a half circle. Be sure to get inner side of the arm scanned from all angles.
3) If you need to scan the hand as well, make sure that the fingers are straight and as motionless as possible. Scan the palm from the front and the back, and make a swift scanning motion from below, to scan area between fingers.
What to avoid:
If fingers on the hand will be bent, it will be nearly impossible to keep them motionless, which is bad for scanning.
If arm is too far from the body, there won't be enough geometry reference and scanner may loose its tracking.
For scanning bent arm:
1) The pose here is slightly different:
Be sure to leave enough space between torso and the arm to be able to scan the arm without torso obstructing the scanners field of view.
2) Also it's important to scan arm from below, keeping torso in field of view will help not to loose tracking.
3) Instead of going around the person, it's okay to ask person to rotate his upper body - it shouldn't change the shape of arm nor the body.
4) Tips about scanning hand are the same - straight motionless fingers, quick scanning motion for scanning area between fingers, be sure to keep more surface at the background.
After scanning arm either way make Fine and Global registrations set to "Geometry" and any sort of watertight fusion should be enough for a good model. The body that was scanned to improve the tracking can be easily removed by swipe of a defeature brush.
Optimal post-processing settings
After scanning arm either way make Fine and Global registrations set to "Geometry" and any sort of watertight fusion should be enough for a good model. The body that was scanned to improve the tracking can be easily removed by swipe of a eraser brush.
Quick, all-around scan of human arm made with Artec Eva can be downloaded here: https://www.artec3d.com/3d-models/arm
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