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Question concerning 3D Layer and Blendmode

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Chris Vile
Question concerning 3D Layer and Blendmode
on Feb 21, 2013 at 10:01:01 am

Hi Guys,
I´ve a question concerning 3d-layers in after effects.
Ok, I got two 3d objects laying behind each other on z.

Its just a keyed person (in front)which should interact with a lightstroke-animation (in back)
The one behind is set to an add blendmode .
But now I see the backlayer through the frontlayer.
I don´t want this.
How can I solve this problem please?
Hope you can help me out.
Thank you very much.

Cheers,
Chris


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chris brett
Re: Question concerning 3D Layer and Blendmode
on Feb 21, 2013 at 10:47:25 am

hi chris - dont know for sure but I would try pre=comping the bg plate plus the additive mix layer then adding te next layer to the pre-comp ----chris --


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Vishesh Arora
Re: Question concerning 3D Layer and Blendmode
on Feb 21, 2013 at 12:15:35 pm

Chris

But now I see the backlayer through the frontlayer.


What do you mean by this? A screenshot of composition panel and Timeline depicting the problem would help.

Vishesh Arora
3D and Motion Graphics Artist
Films Rajendra

Blog:
http://digieffects.wordpress.com

2011 3D Demo Reel:








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Tudor "Ted" Jelescu
Re: Question concerning 3D Layer and Blendmode
on Feb 21, 2013 at 8:29:44 pm

Yes, a screen grab would help. What is the order in which your layers are stacked?

Tudor "Ted" Jelescu
Senior VFX Artist


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Chris Vile
Re: Question concerning 3D Layer and Blendmode
on Feb 22, 2013 at 11:23:40 am

Hi Jelescu,
first thanks for your reply.
The additive light-layer lays above the keyed guy. But I want the lightscreen be placed in the back and it should fly in front of the guy. It should keep the typical light-style look, so I thought I need to set the Blend to add.
Thanks a lot,

Cheers,

Chris


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Chris Vile
Re: Question concerning 3D Layer and Blendmode
on Feb 22, 2013 at 12:56:11 pm

Ok,
now I tested the screen blend, and normal blend on the "lightscreen"-layer.
Both, the screen and add blend let the "lightscreen" shine through the front object. I rearranged the order and when I lay the lightscreen under the frontobject it disappears but when I want to let it fly in front of the frontobject it disappears, too. I don´t know why, but it doesn´t work.
Strange because it shouldn´t care if the mode is set to add or what ever when in use of a 3D-Obj?
In normal blend everything works fine but the glassy/light-look it gone. Any ideas?
Thanks a lot.

Cheers


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Tudor "Ted" Jelescu
Re: Question concerning 3D Layer and Blendmode
on Feb 22, 2013 at 5:12:31 pm

Blend (or Transfer) modes affect all layers under the layer that has it.
You may need to have 2 layers with the light -one on top and one under and turn on and off the Transparency from the bottom to the top duplicate layer at the point where that should be in the front.
Not seeing the comp is hard to say.
Uploading a screen grab should help us understand better the issue.

Tudor "Ted" Jelescu
Senior VFX Artist


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Darby Edelen
Re: Question concerning 3D Layer and Blendmode
on Feb 23, 2013 at 5:31:44 am

[Chris Vile] "Strange because it shouldn´t care if the mode is set to add or what ever when in use of a 3D-Obj?"

What do you mean by a 3D object? 3D layers should work properly, but there are several effects that are "3D" but render on a 2D plane. These do not get free interaction with 3D AE layers.

So how did you make your 3D lightscreen?

The more information we have the more helpful we can be :)

Darby Edelen


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Chris Vile
Re: Question concerning 3D Layer and Blendmode
on Feb 25, 2013 at 9:29:11 am

Hey Guys,
first thanks for your help!

So, I´ve created two "normal" Precomps, enabled 3D and set the one to transfermode add.

When the add layer is positioned in the back of the other 3D Layer I can see it on(though) the front-3D-Layer. I just want the lightscreen be behind the person and when it flies in front of him it should have a shiny light look.
I tried to reorder the layers but then the lightscreen doesn´t come in front and stays behind the person...
I added a 4in1 shot that should show you what I mean ;-)

Thanks a lot,
cheers

Chris


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Chris Vile
Re: Question concerning 3D Layer and Blendmode
on Feb 25, 2013 at 10:35:55 am

Hi everybody,

I just found out what caused trouble.
I have collapsed the lightscreen-layer!
When I undo that everything works fine.
But please how can i solve this problem now?
I want to have a 3d Cube and precompose it for example.
And when I drop the 3D-cube-precomp into my 3D-sceen-comp how can I manipulate the 3D-Cube-Precomp as an real 3D Object without having this add-transfer-issue?

Thank yoou very much,

Chris


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Darby Edelen
Re: Question concerning 3D Layer and Blendmode
on Feb 26, 2013 at 1:23:11 am

[Chris Vile] "I have collapsed the lightscreen-layer!"

When you collapse transformations AE will use the blend modes set inside the collapsed composition unless you have applied effects to the collapsed composition.

If you've applied effects to the collapsed composition then you will see an option to set a blend mode on the collapsed composition, but it will also break AE's 3D ordering. It sounds like this is what has happened in your case.

If you can apply the effects inside the collapsed composition, do it there.

Darby Edelen


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Chris Vile
Re: Question concerning 3D Layer and Blendmode
on Feb 27, 2013 at 10:24:56 am

Hey Darby,

thanks a lot for your help.
Now I got it.
I´ve tried a bit and now it works :D

Cheers,

Chris


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