display steps in rendering

[cifra]

Good morning, I'm realizing the rendering of a scale, but in the views rendered even high definition do not appear the steps, it appears as if it was a ramp, someone more help me to better view the steps?

 

[Ilario]

Probably all the faces of the steps have the same number of smoothing groups, try to select all the faces that make up the steps and give them an autosmooth with value 45.

 

[cifra]

Thank you so much, I'll let you know.
for the moment increasing the definition of render and "bounces" the result seems not to be evil