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Trick to fade a light?

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Tangier Clarke
Trick to fade a light?
on Jul 14, 2020 at 8:49:42 pm

Does anyone know of any clever tricks to fade a light? I have light with the light type set as a point light. My intensity parameter provides a nice glow on a crimson background. However I want to fade this glow into view at the end of my video; going from a flat crimson to the crimson with the glow of the light.

- Motion doesn't allow fading up of the light.
- I tried putting the light into a group and fading the group, but that doesn't work either.
- Changing the intensity or the Z position parameter doesn't give me the same flat starting crimson color while having the light activated. It has to be seamless.

The only solution I've made so far is to deactivate the light and recreate a similar look using white circle masks, fade ins, and color curves on a white shape; grouped above that crimson background. It's not quite the same look, but it's close.


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Robin S. Kurz
Re: Trick to fade a light?
on Jul 15, 2020 at 9:05:21 am

Not sure what the issue is on your end, because simply keyframing the INTENSITY of any given light is absolutely possible and results in a fade as described.

The only thing I can think of is that your object(s) are NOT 3D, in which case they are not affected by lights to begin with. Faded or otherwise.

- RK

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Tangier Clarke
Re: Trick to fade a light?
on Jul 15, 2020 at 4:19:05 pm

This doe not work. I am aware of the intensity parameter. If you have a solid color and then want to fade up the glow of the light, you cannot do that. It's been asked by the people as well. Having an intensity of "0" causes the underlaying image go to black rather than keep ing the color and fading up just the glow falloff. If there's something you're doing to pull this off please let me know.

See screen recording here.






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Robin S. Kurz
Re: Trick to fade a light?
on Jul 15, 2020 at 5:25:53 pm

Ok, THAT is an entirely different scenario than I imagined.

[Tangier Clarke] "Having an intensity of "0" causes the underlaying image go to black"

Well, yes. I would have thought that's obvious. Once IN 3D any ACTIVE light is the ONLY source of illumination for any given object. If no lights are present, then a global, ambient light is the only default source. You would have the exact same effect in e.g. AE, so Motion is no exception.


[Tangier Clarke] "and fading up just the glow falloff"

How do you figure? You need to imagine the scene as A ROOM! How would it behave any differently if you had just ONE lightbulb in a room with a red wall and you slowly faded THAT up? Clearly you would have to start from complete darkness, no? 🤨

The only way I could see this working in any way is that you have an AMBIENT (maybe even directional) light in addition to the point light, which you DECREASE (or cross-fade) so that ultimately just the point light is left.

OR you just plain have the first and second condition as AN IMAGE and crossfade those.

- RK

____________________________________________________
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Tangier Clarke
Re: Trick to fade a light?
on Jul 15, 2020 at 5:32:40 pm

Thanks Robin. I hadn't considered the last option; the very basic idea of exporting the background with the light as an image, bringing that back in, and cross fading between the two. Sometimes the best idea is really simple, but overthinking something and looking for non-existent options gets in the way.


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Tangier Clarke
Re: Trick to fade a light?
on Jul 15, 2020 at 4:22:27 pm
Last Edited By Tangier Clarke on Jul 15, 2020 at 4:25:26 pm

This is what I want to happen:







One thought, as I mentioned above, is that I set the intensity that I want to end on and use the Z parameter to move the light further away to the point that it matches the color of the background as if there were no light at all. I haven't found this to work well either though and can't get them to match.


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