How do I create terrain texture maps from photogrammetry?


I want to create a terrain texture diffuse and normal map.

To do that, I have capture some terrain with photogrammety:

enter image description here

I have cleaned up the high poly model and created a lo poly model from it in ZBrush.
Then I unwrapped it in ZBrush, and I got this non-rectangular UV map:

enter image description here

How could I bake a rectangular normal map from the high and low poly unwrapped model?

Typical terrain normal maps look like that me (just like the diffuse map):

enter image description here

How could I create such a rectangle normal map with my approach? I don’t want to use CrazyBump or Bitmap2Material. I would like to use my hi / lo poly model to create the normal map.

Thank you!



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