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I have a strange behavior as I am trying to setup micro displacement. I use blender 2.79b. My mesh have a Subsuf modifier from the experimental feature set with the adaptative option turned on, the displacement settings in the material is set to true.

ugly preview render

This is a part of the shamefull result. These black stripes follow the seams I used to unwrap the UVs. On top of that the micro displacement does not show up. Do you know can cause this ?

Ps : Tell me if you need more details.

This is the material nodes setup I'm using. No displace modifier involved.

material nodes setup

Making a normal render did not fixed the issue. The object has rougthly 100k+ vertices accross 150 blender units in x and y. (subsurf modifier unapplied)

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    $\begingroup$ Are you using the displacement modifier or displacement through material nodes? $\endgroup$ – Dr. Farquaad Nov 20 '18 at 0:20
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You have to add a displacement node (shift+A vector/displacement) to your texture and plug it to height socket.
displacement

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Can we have some more info about the scene/object? Also, the apparent lack of adaptive subdiv may just be due to the low resolution of it in the viewport (by default about 8x less detail, I believe). Try rendering the image normally.

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