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I tried to found solution around forum, but i not found enought to answer to my question.
I used octane few times, also if i start with beta, and never used the displacement.
to be more clear i preferred to build an animated png to explain better my problem.

i want to build a material where i mix different material each one with its displacement, but ...
if i put disp on single material = OK
if i put disp on last material mixer = OK
all other test give me No displacement.
any idea?

I think that this is a limitation in Octane. You can't mix displacement maps due to huge performance hint you could get. Displacement only works if linked to the latest material/material mixer node in the shader tree.

-Juanjo

Thanks a lot juanjgon
another question, linked to that...
ok i cannot mix displacement, but if i want to limit displacement to a part of obj with a picture?
how can i do an alpha for a picture with another picture to limit a displacement in some part of it? naturally i want to use a gradient or a picture to drive it.

I'm afraid you can't mask the displacement inside the shader tree. The texture mixer or multiplier nodes are not supported in displacement. You are going to need to paint a texture ready to be used over the whole object UV space, with black zones where you don't need displacement.

-Juanjo

ok, i will find a workaround.