Switching between Alpa/Alpha Inverted with checkbox

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Switching between Alpa/Alpha Inverted with checkbox
by Igor Stikic on Dec 19, 2012 at 11:21:31 am

I want to control with Main comp/Null layer (checkbox) other Comps layers Alpha matte (8 comp/8 layers}. If is Check to be Alpha, and if is unCheck to be Alpha inverted.
Is it possible?

Thanx in advance

Igor Stikic

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Re: Switching between Alpa/Alpha Inverted with checkbox
by Tudor "Ted" Jelescu on Dec 19, 2012 at 12:13:48 pm

Not exactly- at least I do not now how to do it the way you describe, but here's an alternative:
Add a Expression Control/SliderControl to your Null layer and lock the Effect Control panel. Open your Precomp and add Effect/Channel/Invert to the layer with Alpha. Link the "Blend With Original" control with the Slider Control. Now you can control the Alpha - at 100% you will get the layers alpha and at 0% the inverted alpha.

Hope this helps.

Tudor "Ted" Jelescu
Senior VFX Artist

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Re: Switching between Alpa/Alpha Inverted with checkbox
by Igor Stikic on Dec 19, 2012 at 12:36:43 pm

Thank you, this helps!

Igor Stikic

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Re: Switching between Alpa/Alpha Inverted with checkbox
by Vishesh Arora on Dec 19, 2012 at 12:32:29 pm

Igor

You can use Set Matte Effect for this function.

Instead of track matte, use set matte effect for each layer and then parent the Invert Matte checkbox to a controller's Checkbox.

Here is an example:

5103_setmatteeffectwithcheckboxcontroler.zip

But I would suggest you to read about Set Matte Effect first.

Vishesh Arora
3D and Motion Graphics Artist
Films Rajendra

Blog:
http://digieffects.wordpress.com

Demo Reel(3D):

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