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I have used a displacement map to emboss some lettering on a bottle. There are two materials on the bottle, one undisplayed and one with the displacement which is restricted to an area defined by a polygon selection tag

There is a visible join where the two materials meet causing subtle problems with refractions and reflections.

Any ideas on how to fix this?

Hi,
please post a screenshot of that portion of the map, and also a screenshot of the displacement node, thanks.
The Mid-level value has to follow the background color/intensity, or you can have a little displacement in that zone.
ciao Beppe

Mid level is at 0, displacement map is at RGB 0;0;0

the problem is where the underlying material with no displacement meets the material with displacement which is restricted to a selection set. The two materials are stacked.

You should make the map fit the entire shape. That will remove the boundary issue.

Do you mean make the map fit the entire bottle?

I've just had a an idea - is it possible to use a native c4d material for displacement using the displacement deformer, but render using Octane and Octane materials for the actual look of an object?

Yes, have the map fit the entire bottle. Doing so guarantees that the elevations of the displacement will be consistent.

mitchino wrote:I've just had a an idea - is it possible to use a native c4d material for displacement using the displacement deformer, but render using Octane and Octane materials for the actual look of an object?

Yes it is possible, dut you need to subdivide a lot the base geometry.
Do you mind to share with me the scene via PM?
ciao Beppe

Discovered this was not a displacement issue after all, but a tiny difference in roughness between the two glass materials I had on the bottle. Doh.