Alt Docs - Week 2: Volumetric Capture
For volumetric capture, I chose photogrammetry to scan my toy Tidehunter via photoScan and Meshlab.
- For photogrammetry, when capturing the object, we need to make sure:
- No overexposed highlight area in photos.
- Adjust the lighting condition to make the highlight on the object as little as possible, baby powder can help sometimes if we need only need the geometry.
- Try to reduce the reflection and shadow from the base, a rough textile will help
- Usually, over 70 captures and over 80% photo aligned should be fine.
- The positions of capturing are like rings of different ranges. It doesn't have to be linear.
- For photoScan and Meshlab usage:
- Follow the workflow, and do it step by step. Uncheck Generic preselection and lower the accuracy will give us the better photo-aligned result.
- Duplicate chunk after each workflow if the process takes too much time.
- Export as the OBJ format and then it can be imported to Meshlab.
- In Meshlab, select vertexes and delete them to do mesh editing. Wireframe view is helpful.
- OBJ exported from Meshlab doesn't include the material. But it can be found from the photoScan one. Compress OBJ + MTL + JPG(or other format materials) into a ZIP file, which will be sketchfab ready.
- For sketchfab:
- We can play with some basic 3D settings on sketchfab to give us a better result. I think Shadeless looking is better then LIt in my case.
- Sketchfab can allow us to embed 3D models via iframe: