IMHO I would rather start by enquiring with the shop if they can even process polygon models at all ; because if they can't then the time spent sculpting in Zbrush would be wasted. But if they can, then you could get some example files from them to see how they set them up : do they need a thin surface, or a thick slab,…
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Those values are defined in 0.0-1.0 space, which maps to 0-255 in photoshop. To go from 0-1 -> 0-255 result = x * 255 To go from 0-255 -> 0-1 result = x * (1/255) = x * 0.00392 To go from Gamma -> Linear result = x^2.2 To go from Linear -> Gamma result = x^(1/2.2) = x^0.4545 The gamma 2.2 is true in most cases, may differ…
The issue with Crytek, is that they never gave a sign that they were listening. Hell even simple "Screw you, we don't do it!" would be nicer, than permanent silence or copy-paste PR answers... They hopefully change it. They have one month to show dedication to change. And I'm not telling that they should in one month…