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Putting effect in a polygon

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Gabriele Guo
Putting effect in a polygon
on Dec 30, 2017 at 5:51:10 pm

Hi everyone, thanks to who will help me.

I'm a beginner in AE (but I have watched many tutorials on youtube) and I have a question. I drew a polygon filled with a color (ex. blue), then I put the snow effect in it, and then put a tick on "level adjustment" (I think it's called like this, I have AE in another language so I am not sure how it's called in English), because I wanted the snow only in the polygon. All fine until here.

Then I put a background picture and I saw that there is snow in the polygon, but also the blue background color. How do I get rid of the blue background color and have the snow in the polygon with background picture I put as last?

I hope you understood what I'd like to do.

Thank you.


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Dave LaRonde
Re: Putting effect in a polygon
on Dec 30, 2017 at 8:12:00 pm

[Gabriele Guo] "I hope you understood what I'd like to do."

Not really. Can you please describe in detail what you want the viewer to see?

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Gabriele Guo
Re: Putting effect in a polygon
on Dec 30, 2017 at 8:25:48 pm

Okay, so what I wanna do is a very simple falling snow effect through a window.
I want to see the effect only in the window. Otherwise it would be very weird to see snowing in the house lol.
I'm using Particle World for the snow.
I can provide some screenshot of the problem if it's needed.


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Gabriele Guo
Re: Putting effect in a polygon
on Dec 30, 2017 at 10:05:41 pm

I think I found out the solution. I have to work with track mattes.


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Dave LaRonde
Re: Putting effect in a polygon
on Dec 31, 2017 at 2:18:42 am

I'm glad you found something that works. Multiple masks on the windows would also work.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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