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I might have put too many polygons in the mesh and now it won't compile, so I need to lower the polygon number. Is it possible to do something to create an effect which works the opposite as the subdivision surface, but keeping the smooth surface?

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You can use the Decimate modifier: here's the documentation.

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It has three different ways of operation: Collapse, Un-Subdivide and Planar. Choose the one the most suits your needs and change the parameters until you reach the right compromise between smoothness of the surface and face count (which is updated live in the modifier box).

Click "Apply" when you are happy with the result. Please note that, if you are using UV maps, you should use the Planar mode and select Delimit: UV.

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  • Add a decimate modifier

the Add modifier menu

  • click the Un-Subdivide button
  • increase the Iterations field to two

decimate modifier

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  • $\begingroup$ Oh that was perfect! Nowe the PC doesn't lag anymore and the mesh is still smooth hahaha Does anything bad happen if I increase the iterations from 2 to a higher number in order to get even less polygons? $\endgroup$ – Moises Pantion Loza Aug 30 '17 at 17:28
  • $\begingroup$ No : it's its job ;-) $\endgroup$ – Dominique Parisot Aug 30 '17 at 17:30

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