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How do I remove them?

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They don't appear when using flat shading.

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Nothing in the scene can cause this.

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  • $\begingroup$ Cycles is your render? $\endgroup$ – atomicbezierslinger May 19 '15 at 22:19
  • $\begingroup$ Glossy surfaces reflec the things around them... is your environment empty or black?. $\endgroup$ – user1853 May 19 '15 at 23:16
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The problem occurs in smooth shading because it changes the way the shading is calculated across the surfaces, giving the illusion of a smooth surface even if the angle between the faces is sharp.

To correct that, add edge split modifier while all faces are set to smooth shading.

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    $\begingroup$ Would be useful to add why this is the solution. $\endgroup$ – Ray Mairlot May 19 '15 at 22:51
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  • Consider using a mix shader in Cycles. Mix a combo of diffuse dominantly and and gloss to a lesser degree.
  • Replace your first shader with the mix shader then add the gloss and diffuse
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    $\begingroup$ While this does help, it doesn't remove the problem completely. $\endgroup$ – 65465168 May 19 '15 at 22:30

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