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I have Blender version 2.74, and I just can't find a way for myself to create volumetric light, I tried setting in world properties the Volumetric Scatter and then at the bottom enabling Homogeneous, but the render takes way too much time and still no volumetric light, I searched in youtube in hope of finding a tutorial but most of them are outdated or doesn't work for me. Help highly appreciated

What I basicly want is, I have a door and I want the Light(volumetric)rays to be seen coming from that door.

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    $\begingroup$ Could you be more precise about what is not working? Could you add screenshot of your test scene showing your world's settings and the "failing" render preview? $\endgroup$ – Carlo Sep 27 '15 at 19:40
  • $\begingroup$ I am not even sure that I am using the correct method, to be honest $\endgroup$ – Igor Tatarnikov Sep 27 '15 at 19:44
  • $\begingroup$ Are you rendering on GPU? and if so, what kind? $\endgroup$ – cegaton Sep 28 '15 at 1:58
  • $\begingroup$ Nope, only on CPU $\endgroup$ – Igor Tatarnikov Sep 28 '15 at 6:21
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Starting from a simple scene like the one below:

enter image description here

Set up the lights. In this case I put a simple spot lamp.

enter image description here

Now add a Volumetric Scatter shader to the World's material volume output.

enter image description here

Light scattering will dim the overall light of the scene, as some bunces "get lost" while trying to reach the camera. If before they were running undisturebed trough the air, now the have to penetrate in a sort of thick fog, so we'll need a stronger light to see something.

I'll start from lowering the the density of the shader to 0.5 and at the same time increasing the strenght of the lamp by two orders (x100).

Result:

enter image description here

You'll need to increase considerably the number of samples to get rid of the noise.

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  • $\begingroup$ Thanks, I would suppose my light was too weak for me to see it. But is there a way I can create a volumetric light in Cycles without affecting the other surrounding lights, like the halo setting in the Blender Redner ? $\endgroup$ – Igor Tatarnikov Sep 28 '15 at 6:24
  • $\begingroup$ Yep; Thanks for help, setting the light to a higher value, made it $\endgroup$ – Igor Tatarnikov Sep 28 '15 at 6:53

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