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Casting light

Posted: Thu, 16th Apr 2009, 6:10pm

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ccliffy

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I cant seem to find how to have an emitter cast whatever its main color is on the video track below to make it more realistic. An Ambient Light grade object isnt right as it doesn't seem to come from the emitter

thought it was a 'Light Spill' . but I think that its for the opposite effect : having light from background spill onto current track
Posted: Fri, 17th Apr 2009, 12:15am

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Axeman

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SuperUser

Not quite sure what you are trying to achieve; what is the effect you are working on?
Posted: Fri, 17th Apr 2009, 12:25am

Post 3 of 11

ccliffy

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if someone is holding up a blue energy orb - it should cast a blue light on person's face and hands though situation applies to any particle effect, neon light etc. in a scene
Posted: Fri, 17th Apr 2009, 12:36am

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Axeman

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Ah, gotcha. The most common method is to use a grade object over the layer that will be affected by the light, with masks to limit the affected area.

Another option would be to duplicate the particle effect, scale it up a bit, apply a heavy blur to eliminate any detail, and change the composite blend mode to Add or Screen. This would have the advantage of duplicating into the cast light any sort of flicker that the effect might have.
Posted: Fri, 17th Apr 2009, 12:41am

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ccliffy

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I'll give that a try. Thanks. I really should have a better handle on composite blend methods
Posted: Fri, 17th Apr 2009, 8:52am

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Simon K Jones

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You could also just slap a glow composite filter on it.
Posted: Fri, 17th Apr 2009, 1:31pm

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ccliffy

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and add a mask to make it look like orb is illuminating certain areas like person's face I assume?
Posted: Fri, 17th Apr 2009, 2:17pm

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Axeman

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If you want the lighting to be that interactive,where it only hits portions of the face/character in a believable way, then a practical light on set is really the only way to go.
Posted: Fri, 17th Apr 2009, 2:34pm

Post 9 of 11

ccliffy

Force: 1075 | Joined: 11th Feb 2009 | Posts: 9

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a little off topic but can you explain how a grade object (above track you want affected) is different than using composite properties of track you want affected if you use same thing?

eg: I can add a grade object above Track1 (footage) > go to Composite Property>choose Glow:Composite

or
use Composite Property>choose Glow:Composite of Track1

they both seem t produce same result
Posted: Fri, 17th Apr 2009, 2:43pm

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Axeman

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A Grade Object affects every layer that is below it. Also, a mask applied to a footage layer will mask out the actual footage, while a mask applied to a grade layer will mask out the grade effects contained in that layer. If you want to mask a grade filter, to limit the areas it affects, a Grade Object is the way to do it.
Posted: Fri, 17th Apr 2009, 2:53pm

Post 11 of 11

ccliffy

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ahhh - thanks! smile