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Version 2.79 (official) on Win10

I created a lens using a mesh with hyperbolic math function (z = sqrt(x^2+y^2 +1) and boolean modifier using a box to cut of.

I used glass BDSF shader, copied the lens with Ctr-D and rotated one of the two 180° on x-axis In render view one of the two looks as expected, the other one is completely black. I can reproduce it with exchanging both (the one with convex side on top is black)

What could be the reason ? (see pictures 1 and 2 with different view angels)

rendered view 1 rendered view  2 view 3

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    $\begingroup$ probably bad normals -> CTRL-N (recalculate in edit mode) $\endgroup$ – Jaroslav Jerryno Novotny Jan 1 '18 at 19:32
  • $\begingroup$ Your material also has only one user. Double check to make sure both lenses have the proper material. $\endgroup$ – Brenticus Jan 1 '18 at 20:00
  • $\begingroup$ Cntrl-N didn't solve the problem. And I have the same material for each of the lenses, with exactly the same properties (thus you see only one user) $\endgroup$ – jb0815 Jan 2 '18 at 19:58
  • $\begingroup$ I deleted the whole file and startet from scratch, now everything works and I can‘ t reproduce. $\endgroup$ – jb0815 Jan 13 '18 at 12:55

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