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I'm using a volumetric spot light, and in a animation, i'm moving the light so it shows some elements, and for now i got there three objects, but i do want to know if for example it is possible to totally hide (fade in totally black) the objects that aren't below the light, as you can see in the picture, those are still shown, as faded-gray objects. I already changed the light strenght, but if i do that i lose another illumination detail that i already made. Is there any way to fix this? if not ill just edit the video on an editing software using a mask.

Thanks in regard :)

enter image description here

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  • $\begingroup$ Is the world background color pure black? $\endgroup$ – PGmath Feb 11 '15 at 17:09
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You can change your spot with a 0 bounce (direct light only). The light won't bounce outside you volume anymore.

enter image description here

This will affect the lighting of your main object (no indirect light), so you can move the 2 others to another layer and add a "no bounce" Spotlight (duplicated or parented if animation is needed) and composite render layers. Your main object (with a spot with more than 0 max bounce) will have a nice direct and indirect lighting and the others won't be affected by bounces.

This setting was added in blender 2.73 official release (release notes)

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You could also handle this in the same way you would if you were using a camera; by adjusting the exposure settings. These can be adjusted in Properties > Scene > Color Management, or of course in the compositor.

Before:

enter image description here

After:

enter image description here

I rather liked the yellow look of this film preset :P

This way you get to keep indirect lighting :)

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