Weird artefacts in final render

[ondrej zeman]

Im getting various weird artefacts in my final render. The area which has the artefacts, is in fact created in Dimension using the Cube object. Any idea why that happends and how to avoid it? I actually did another render in slightly different angle and the artefacts appeard on same line, but a little bit higher.

[Ares Hovhannesyan]

May be this artifact coming from material. Did you try to change material?

[Ussnorway]

they look like rendor pixels which is what you get when you don't convert a basic model as part of your workflow

[ondrej zeman]

Actually I found out, that if I set render quality to High, then the artefacts are gone. Also in Low quality, so it is just the Medium quality that causes this....