Compacted Gravel - Photogrammetry based Environment Material
Another ground surface I captured with the flash and full cross polarisation. In these certain light conditions this surface could be captured without flash as well, but lack of light would need to be compensated with longer exposure time, therefore some risk of blur and overall longer capture time. I used color checker for color calibration but since the value wasnt correct I retweaked the result using values captured with the color spectrometer. Will share more info about this in a future
Since I am happy with the quality of this material, I have added it to my material library:
https://gum.co/WJAQy
as 'gb_gravel290'. Currently the library contains 70 high quality scan based environment materials I captured :D
Cheers!
G.
PBR preview: Albedo / Normal / Height / Roughness / Ambient Occlusion
Tiling preview rendered in Marmoset Toolbag 4
Source location - where I took 224 images with the AR400 flash used to guarantee light consistency and get rid on any ambient occlusion shadows. I guess in these light conditions this surface could be also captured without the flash.
Source location - surface details with my shoe used as a scale reference
Source location - tools used as color and scale reference for further calibration.
Agisoft Metashape - 127mln poly heavy photogrammetry reconstruction based on 224 24Mpx images
Agisoft Metashape - level of reconstructed geometry details
PhotoLab - color calibration and image tweaks - before/after. For reconstruction I turned all RAW data into 16bits TIFF files. Camera settings used for this capture are in the top left corner of the Photolab
ZBrush - low poly model creation and alignment for PBR texture baking. I used captured rulers as a scale reference so I covered exact area I wanted.
The material and texture set was added to my material's library:
https://gum.co/WJAQy
as 'gb_gravel290'