Displacement and RGB Offset

[Mnietek2707]

There are problems when "RGB offset" of displacement texture is less than 0 and there is no VRayDisplacementMod (displacement is controlled through "Default displacement" settings).
Then displacement has no effect

Vray 5.10.00. max 2020

[hermit.crab]

Well, manipulating the texture through the RGB offset (which adds/subtracts the value from the original RGB value) has an effect on the displacement since it serves as its base data. Depending on the texture, negative values may lead to a negligible or non-existent displacement. If you think this is not the case, do attach some screencaps so we can take a look.

[Mnietek2707]

manipulating the texture through the RGB offset (which adds/subtracts the value from the original RGB value) has an effect on the displacement

Hmm.. I am aware of that

Here is max file which clearly (I think) shows my problem: displacement texture RGB offset.zip

[hermit.crab]

Thanks for the provided scene. Everything seems to work as it should, however, it is the comparison that is wrong. The VRayDisplacementMod, unlike the default displacement, has custom texture value boundaries options (Texmap min/max), which allows both negative and positive displacements to work together, which is why the RGB offset is still visible (the texture is previewed as pure black since the values are negative). Also, the Amount values in the scene were not identical. If you set the VRayDisplacementMod's Texmap min/max to 0 -1 and set both displacements amounts to i.e. 10 the results will be similar.