Hi all,i solved the problem by changing the scale in c4d exporter and in the octane obj preference. Thanks to all
Great!!!!

Hi Chris,thnx for reply, you can find post the obj file. I've try to scale the object but don't change nothing,i think the problem stems from the normal or geometry but i do not know how to fix it.
Thanx a lot
Giacomo

Hi all, i've some problem when export some surface in octane render standalone. Usually i make this operation : 1- select and export the surface from rhino in obj 2-merge the object with c4d and assign material 3- use the latest version of c4d exporter and load file with octane render standalone ...