Grzegorz Baran
Expert Materials Artist at Ubisoft Reflections
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Grass - Photogrammetry based Environment Material

Another material I captured while working on the video about surface scanning with the flash:

Grass is the type of these reflective substances where cross polarisation approach makes the difference. Since it is also a very complex type of surfaces, to be useful for material it needs a lot of image overlapping to make sure we have enough data for reconstruction, especially that the geometry has to be dense enough to carry enough height information for baking.
Since this material turned pretty well, I added it to my material's library:
https://gum.co/WJAQy
as 'gb_grass306'
Cheers!
Grzegorz

PBR preview: Albedo / Normal / Height / Roughness / Ambient Occlusion

PBR preview: Albedo / Normal / Height / Roughness / Ambient Occlusion

Tiling preview rendered in Marmoset Toolbag 4

My photogrammetry workflow (more details on my youtube channel: https://www.youtube.com/c/GrzegorzBaranArt

My photogrammetry workflow (more details on my youtube channel: https://www.youtube.com/c/GrzegorzBaranArt

Source location - area I captured marked with rulers which were used later as a scale referece for low poly model alignment. In this case the tripod helps to maintain consistant distance during the entire capture and holds most of the gear weight.

Source location - area I captured marked with rulers which were used later as a scale referece for low poly model alignment. In this case the tripod helps to maintain consistant distance during the entire capture and holds most of the gear weight.

Source loacation - I captured this surface with the AR400 flash and cross polarisation by taking 398 images. This is not the actual flash power preview as it lasts for less then 1/300s while camera records just 30 frames per sec

Source loacation - I captured this surface with the AR400 flash and cross polarisation by taking 398 images. This is not the actual flash power preview as it lasts for less then 1/300s while camera records just 30 frames per sec

Source Location - Grass height with my shoe and rulers used as a scale reference for optional material setup.

Source Location - Grass height with my shoe and rulers used as a scale reference for optional material setup.

The source - cross polarised zoom into a single grass blade to show its complexity :)

The source - cross polarised zoom into a single grass blade to show its complexity :)

Agisoft Metashape - camera alignment and photogrammetry reconstruction. Since grass is a very complex subject, to cover this surface I took 398 densly overlapping images.

Agisoft Metashape - camera alignment and photogrammetry reconstruction. Since grass is a very complex subject, to cover this surface I took 398 densly overlapping images.

Agisoft Metashape - reconstructed geometry detailsfrom close view to show subject complexity

Agisoft Metashape - reconstructed geometry detailsfrom close view to show subject complexity

ZBrush - low poly alignment for baking. As said, I used rulers as a scale reference to cover exact area.

ZBrush - low poly alignment for baking. As said, I used rulers as a scale reference to cover exact area.

The video I made to cover captures with the flash. Shots from this capture were used at 13:44 and 19:07 of this video.

The material and texture-set was added to my material's library: https://gum.co/WJAQy as 'gb_grass306'

The material and texture-set was added to my material's library:
https://gum.co/WJAQy
as 'gb_grass306'

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