These are some of the textures I've created for my personal "Silent Cartographer" remake.
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Forerunner Floors: I imported texture maps from the original game into Blender, so I could remodel each panel and vent in 3D. Then I brought the HP meshes into Marmoset Toolbag 3 to bake additional maps. I finished the the texture painting in Substance 3D Painter.
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Grunt Blood: These are entirely hand painted in Substance 3D Painter. I did these while listening to "The Act Man" rant about sprint in the background. These renders use adaptive subdivision for displacement. But the UE5 decal will use parallax occlusion mapping.