enter image description hereThere are those triangulated shadows on my object in the rendered viewport and in the render,I use a sun as a lamp.How to avoid those weird triangles?

  • $\begingroup$ Your light is very sharp, you can see the shadows cast by the individual polygons even though it's shaded smooth. $\endgroup$ – CtrlAltF2 Aug 12 '20 at 20:00
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    $\begingroup$ Does this answer your question? Some areas of the mesh are dark $\endgroup$ – CtrlAltF2 Aug 12 '20 at 20:01
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    $\begingroup$ This is a terminator artefact, so although you wouldn't fairly know it, the question has been asked before. The issue will be partly got-around in 2.9. $\endgroup$ – Robin Betts Aug 12 '20 at 20:01
  • $\begingroup$ blender.stackexchange.com/questions/27982 $\endgroup$ – Duarte Farrajota Ramos Aug 12 '20 at 21:12
  • $\begingroup$ I have already used Smooth shading and increased te polygon count but the problem is still there $\endgroup$ – Antalia Ariel Aug 13 '20 at 0:47