Help : Need to convert normal map to displacement map

[TVeyes]

Do you no longer have the detailed model in Zbrush? The simplest solution would of course be to generate the displacement map in Zbrush using that model but I guess that is not possible in your case?

There is no way to generate a displacement map from a normal map in Zbrush. A normal map can be generated from a displacement map but not the other way round. The reason is normal maps only contain vector/normal information but no depth information. A program or script could be made to calculate the depth based on the vectors/normals but that depth would not be the same as a proper displacement map, calculated from the low poly Vs high poly model.

Maybe someone else knows otherwise but from where I stand I cannot see it being possible.

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