2022-11-28 / 9h to 14h (5h)
For this last workshop based on techniques for 3D reconstruction we gathered 3 groups of data :
Total raw pics produced: 222
Successful Panoramic Views Rebuilt: 2
360° Equirectangular shots/rebuilds: 2
Total pics delivered: Work in Progress
Nb of Cameras: 3
Camera Types: Handheld 3D Scanner Einstar Shining3D, iPad Pro M1, Canon 5Ds
Corrections required on previous models to compensate : sponsons down faces were missing data hence were messy for reconstruction.
3D Scanner is very low texture sensitive on homogeneous surface with satin paint or repetitive patterns such as metal bolted plates of the tank sponson internal surface. Many tracking losses occured even with the help of marking stickers all around, causing the digitization to become extremely slow and painful.
Also, the pilot computer station somehow was too short in memory and data processing power, causing the firsts scans and recording time to be evenly painful until we downgraded the 3D scanner resolution. This is by far the major issue to adress for futureproofing of the workflows.
The scanning benchmark is a success, even considering the difficulties encountered. First observation is that even if the hardware may have become way more accessible than in the recent past, the required processing hardware attached still cost high value and need training to be properly used. For reference, when writing this report : Einstar Shining 3D opening price is 1K€ instead of usual =10k€ for this type of devices, but need at least a +3k€ computer laptop / mobile desktop workstation to operate properly with acceptable processing and saving delays.
Compared to Apple iPhone/iPad Pro handheld standalone devices, the accessibility's gap stays a huge step in productivity :
The Mark IV vehicle has been a perfect sample for meeting with the challenges of this type of digitization, as the satin yellow-ish semi-reflective paint, large surfaces of the same color with no discernable patterns for the machine to compose with as the guns portholes and bolts are basically undiscernable from one to another by the machine. Therefore the operators are to be extremely careful not creating "ghost features" baked into the model which are extremely slow and painful to remove in post-production and may affect the overall quality of the scan.
At the end, to be usable in daily museography or online transmission digital creations, models have to be drastically downscaled with high complexity decimation since the original file may store trillions of points, where usual web-compliant 3D models should only count millions. This processing also adds time-to-readiness and reduces user-friendly workflow, added with necessity of texture recompilation at each steps.
The good point here is from a scientific perspective the experiment still confirms hardware and workflows are globally far more accessible than just a few years earlier though... And starting to be worthit for a cultural heritage institution to be owned and used on a daily schedule.
Objet Témoin ASBL website is proudly curated by J. Vandanjon Consulting - Our work is documented under creative commons license, but some items mentioned and illustrated may be regulated by specific conditions of private collectors, NGOs, foundations and public museums. Please advise. thx.