Cobblestone - Photogrammetry based Environment Texture
Another cobblestone surface I captured practicing photogrammetry with the monopood. This time I set the focal length even wider to 18mm and took 79 images - I got more overlapping but at the cost of detail quality and in result reconstructed the surface as just 49 mln dense poly mesh. Same as before, I decided to covered slightly less to 2 square meters.
This is my photogrammetry workflow (more details at: https://www.artstation.com/artwork/K0PYG)
Source - captured area
Source - capture using monopod to stabilise the camera. To avoid direct shadows I picked the surface hidden in a buildings shadow. With the focal length set to 18mm and f/8 I managed to get average exposure time around 1/125sec.
Source - shot surface details and my shoe as scale reference
For those who might need it for substance color picking etc.. here is the reference image with Color Checker I used to calibrate albedo.
Reconstruction in Photoscan based on 79 images
Lowpoly over highpoly surface coverage in Zbrush
Baking settings in Substance Designer baker
Substance Designer - final tweaks and additional PBR maps generation (roughness and heightmap)
1k material preview