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When I activate the shading Rendered in the viewport, the number for path tracing sample keeps going with a single number. The number of the last sample is usually listed but it is not the case in the file I imported from a site. I checked the render settings and the number of samples for the preview is set to 0, the one for the render is set to 55. But the render keeps going for an hour and more. I wonder why.

Nathalie Lambert
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    If you set the viewport samples to 0 blender actually interprets it as infinity. If you don't want it to continue rendering forever set the viewport samples to a non-zero value. – Lukas Valine Jun 22 '17 at 20:02

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If you look at tooltip, you will see "unlimited if 0":

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So it will render until you stop it.

Crantisz
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  • Putting in 0 and rendering a small area of the image (where noise mostly occurs, shadows for example), shows you how high you need to get with your samples for a noise free image. – yann Jun 22 '17 at 22:07