Gravel - Photogrammetry based Environment Texture
Another photogrammetry based environment texture. This time to speed up a capture I mount the camera a bit higher as usual, so instead of using standard angled 90 degree folded arm, this time I used arm to lift camera up. Unfortunately to avoid getting tripod's legs in each frame I had to twist the camera a bit and shot less perpendicular to the surface. I set the cameras focal length to 35mm.
Since surface was pretty flat it was ok but didnt increase the capture speed as I expected.
With this material I also tested 'gradient removal' node in Artomatix. THe last update was a really big step forward, but unfortunately still has no any AO removal tool.
Next time I am going to present similar approach but with wider 24mm focal length with its pros and cons :) so stay tuned.
This is my photogrammetry workflow - still experimenting with 'Artomatix' and replaced Photoscan with Metashape (more details regarding to my workflow at: https://www.artstation.com/artwork/K0PYG)
The source - this time I set the camera higher and with the focal length set to 35mm took 129 images. Instead of markers to mark capture progress I used the second ruler. It helps to get better and more even surface coverage.
The Source - surface details with my shoe and ruler used as scale reference.
The reference image with the Color Checker I used to calibrate colors in PhotoLab2
Metashape reconstruction preview - because I mount the camera higer to remove tripots legs from the frame I had to set less perpendicular to the surface angle
Metashape - Dense Cloud details preview - As surface was pretty flat, with less perpendicular to the surface shooting angle, Metashape still had enough data to reconstruct all surface details.
ZBrush - lowpoly coverage over highpoly scan - I covered 180x180cm of real space
Artengine Artomatix in action - in 2D view I masked areas I wanted to be skipped by AI during seam removal and texture reconstruction. I also used GRADIEN REMOVAL node to calm down color differences within the surface and make tiling less noticeable
The 360 HDRI Panorama preview I used as a CG light source for still render and live preview.
This is the one from my new incoming HDRI Panorama pack :). This preview file is in lower resoulution since have to downsize it a bit for artstation preview.
The final PBR material preview in 1k resolution