Displacement banding - shading artefacts

[Chris]

So basically I'm trying to render a grass material with displacement on a flat plane. The plane is made up by one polygon. The plane itself is 60 by 60 meters. Its for an archviz project I'm working on. Just need a quick good looking grass basically.
My system units is set to meters by the way.

I get these strange triangular shading errors on the plane, and i also get banding. Tried to adjust the Ray epsilon setting, but it doesen't help very much. I'm using OctaneRender® for 3ds max® v2.22.2 - 1.1 [TEST]. Had the same issue with the previous version.

So i tried this: Smoothing on, smoothing off. Unwrapped the thing so its within uv channel 1. Nothing helps.

Any suggestions?

[akira]

Hi, displacement doesn't work with bump or normal mapping, dunno if you combined them in your material node.

[Chris]

I have no normal maps or bump maps in the material. Just a plain glossy material with a diffuse texture map and displacement. Thanks anyway

[oudou]

did you rise a bit the amount value in the disp map ?
Keep the "edges rounding" value in general glossy mat, to 0 too.