ㅤ
Photogrammetry Files and Workflow Documentation
Author: Andreas Bueckle (https://andreas-bueckle.com/)
Date: December 29, 2024
Overview
In this project, a wooden sculpture depicting Virgin and Child with Saint Anne was photogrammetrized. The 15th century art piece was stolen in 1973 and resurfaced in 2024, then returned to its original place in St. Cyriacus in Wiesensteig, Germany (website in German). A news article is available in German. A more detailed video is available in German.
Result
Figure 1. This LOD 2 model of the St. Anna sculpture features ~200,000 polygons and is ~7.5 MB large.
Please contact Andreas Bueckle (abueckle@iu.edu) for access to the models, including the LOD 0 one.
Workflow
The following steps were taken:
- The sculpture was placed onto a wooden table in a large, naturally lit space.
Figure 2. The sculpture sitting on a table, ready for taking photographs.
- 326 raw images in the RAF format were taken with a Fujifilm mirrorless camera and a 23mm lens (see Hardware below).
- All 326 images were imported into Reality Capture (see Software below) and a 3D model was computed in ~5 hours on a laptop running Windows 11, 64 GB RAM, and a Nvidia A2000 GPU.
Figure 3. A screenshot of Reality Capture, including the 3D view (left) and a view of one of the images used to construct the model (right).
- The final model was textured and exported using the official tutorial at https://www.youtube.com/watch?v=kRD0rgCnOWQ.
- The original model from 326 photos has 212 million polygons and was not exported.
- For the LOD 0 export (highest resolution), the export out of Reality Capture was used (10 million polygons).
- For the LOD 1 export (lower resolution), the model was imported into Blender to combine mesh and textures resized in Photoshop.
- For the LOD 2 export (lowest resolution, see Figure 1), the model was again imported into Blender to combine mesh and textures resized in Photoshop.