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Can someone give to me any suggestion to set up correctly the spot lamp ? I would like that the light is like the one that you see on the last attached picture. I watched a tutorial,I tried different kind of parameters,but I'm not fully satisfied....very thanks.

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Marietto
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    increase the light size so that the shadows are softer. Read: https://blender.stackexchange.com/questions/77336/how-to-minimize-soften-the-shadows/77347#77347 –  Nov 24 '17 at 21:08
  • How can I make the light wider ? as you can see,the light should have also a larger radius... – Marietto Nov 24 '17 at 21:40
  • maybe something like this ? https://blender.stackexchange.com/questions/24493/is-it-possible-to-make-visible-spotlight-lightrays – Marietto Nov 24 '17 at 22:11
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    To control the softness use lamp size. To have a wider radius change the spot shape size. To have volumetrics add volume scatter on the world or create a domain. Read: https://blender.stackexchange.com/questions/45153/atmospheric-lighting-in-cycles/45154#45154 –  Nov 24 '17 at 22:44
  • ohhh nice. you are the n. 1. – Marietto Nov 25 '17 at 00:05

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To control the softness of the source move the Lamp Size value.

The larger the light source the softer the shadows (read: How to minimize/soften the shadows?).

enter image description here (Click on the image to enlarge)

To change the radius of the light change the Spot Shape Size (in degrees).

enter image description here (Click on the image to enlarge)

To have volumetrics add volume scatter on the world or create a domain.

enter image description here

read: Atmospheric lighting in cycles

  • I used a domain and this is the result that I've got : https://drive.google.com/open?id=1gQCBxJvN-kMvQF2tUrwVMcF2SRLqspRl – Marietto Nov 25 '17 at 17:24