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I have made a smoothed studio-like setup and spot light linked to my object.

enter image description here

The Object turns round itself for few seconds and then moves forward toward the camera

(I have marked them in the second photo, though it's a bit hard to see in only one picture).

enter image description here

As the object moves forward, some unwanted wave-liked shades appear in the background and move. Do you know what is causing the problem and how can I fix it?

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Without knowing in which format you are rendering and what quality settings you use it's hard to tell the exact reason, but these are no shades depending on the animation itself or the render settings, I guess. These effects are called Banding, Colour Banding or Posterization and can appear in all kinds of software or images. It's usually a problem of insufficient bit depth to display smooth color transitions. The reason for the low quality can be high compression in image or video formats for example.

Short articles on these topics:

https://en.wikipedia.org/wiki/Colour_banding

https://en.wikipedia.org/wiki/Posterization

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  • $\begingroup$ Hi Gordon, This is exactly the problem. Thanks for your detailed answer. I am working on that. $\endgroup$ – Shahed Ahmadi Apr 17 at 16:57
  • $\begingroup$ Glad it helped. You might consider to mark the answer as accepted then so that others know there is a solution. $\endgroup$ – Gordon Brinkmann Apr 17 at 17:44

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