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Fynn Ribbeck avatar image
Fynn Ribbeck asked ·

Negative Light?

Hi,


I was just thinking if it would be possible to make a "light" that instead of light projects darkness? I know this is physically impossible, but it would be incredibly handy when lighting a scene, where it is always much more easy to light a specific thing than to darken it. It's probably not possible to it within the vanilla Arnold, but maybe with a kind of tiny "mini-plugin" could it be possible? Something like a projected shadow that absorbs the light it hits?

c4dtoalightlightingshadow
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Lee Griggs avatar image
Lee Griggs answered ·

This is an old trick from the '90s (yes I am old) for faking lighting. Quite expensive to render I seem to remember. Why would you want to do this in a physically accurate renderer? The light_blocker might be of some use instead.

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Only for artistic reasons. I also use a ton of light linking, which ins't physically accurate too.

Thanks for the light_blocker tip, I played around with gobos and slates but this might work as well.

Thanks!

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