key "." works, shift + ctrl works. but when zooming with ctrl only or shift only - it stops

for example on a screenshot while zooming out that brown cylinder - it shows black squares like your render is not finished yet

Camera settings?

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    $\begingroup$ Probably the inner and the outter faces of your model are too close to each other. Hit N and turn on Backface culling. $\endgroup$ – FFeller Jul 22 '19 at 16:20
  • $\begingroup$ thanks. no, it always worked well. i increased clipping and it almost works well. anyway it stops zooming in or out sometimes and i press .del then $\endgroup$ – Artem Kuzmin Jul 22 '19 at 16:34

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