I will be scanning tree branches in the next few days as a method trial for comparison against LiDAR scans with a Riegl VZ400. I will cut the branches from trees and scan then in the lab/studio. My goal is to produce as good a point cloud as possible (not so worried about the mesh, though they go hand in hand), and definitely not worried about color. I am mainly concerned about the reproduction of structure to the finest level possible.
I have 2 studio lights with diffusers (Elincom D-lite 2) + fluorescent ceiling lights, a rotating platform, and a green screen. My camera is a Nikon D7000 (will take RAW and convert to jpg). The branches are relatively large - maybe up to 2 meters in length. There seem to be a few options i have to choose from, and advice would be much appreciated (I'm new to photogrammetry):
1) Move around the branch with the camera, or rotate the branch with the camera fixed?
The only downside to rotating the branch would be that the lighting relative to the branch changes with each photo. How much of a problem might this be, given that the light isn't completely even?
2) Use a green screen or not?
Rotating the branch would allow the use of the green screen in back, which could potentially help with the recognition of finer branch sections, but I'm not sure how it would interact with realitycapture's algorithms.
3) Use targets?
I've heard some mention of using targets in realitycapture, but not much. Is it possible?
Thanks very much for your attention!
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