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Alpha add does not work to close unwanted seam

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Lan Lan Liu
Alpha add does not work to close unwanted seam
on Apr 16, 2018 at 6:45:22 am

Hello,

I have a flipbook animation made with masked 3d layers of a very simple shape. Everything is aligned perfectly. When the page turns, I notice a thin seam in the middle just as the rotation of the 3d layer begins to change. From the web, I found that the solution to this problem should be to change the blending mode of the layers to "alpha add". However, nothing changed after I changed the blending mode. I was wondering if anyone can shed any light to my problem? Thank you so much!


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Roei Tzoref
Re: Alpha add does not work to close unwanted seam
on Apr 16, 2018 at 7:32:59 am

Alpha add won't work in some cases, just increase the mask expansion in 1 pixel.

Roei Tzoref
2D/VFX Generalist & Instructor
♫ AeBlues Tutorials ♫
http://www.tzoref.com


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Lan Lan Liu
Re: Alpha add does not work to close unwanted seam
on Apr 16, 2018 at 5:49:42 pm

Thank you Roei,

Unfortunately the 1px expansion didn't work either. I believe it's because I have 3d layers stacked on top of each other because when I remove all the 3d layers underneath, there is no seam during flipping animation (the background color does not show through).


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Steve Bentley
Re: Alpha add does not work to close unwanted seam
on Apr 16, 2018 at 8:21:56 pm

Try shifting one or more of the layers 1 more pixel in the z than the other layers - you may be seeing some overlap



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Lan Lan Liu
Re: Alpha add does not work to close unwanted seam
on Apr 17, 2018 at 3:27:14 pm

Thank you Steve and Ronald,

This forum is so supportive! Somehow shifting the z-index and the minimax effect still won't work in my case. I found that the problem will go away if I make the bottom layers back to 2d and only keep one top layer as 3d. This solves my issue. I will just have to change my work flow.

Thank you! I learned quite a bit from this thread :-)


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Roland R. Kahlenberg
Re: Alpha add does not work to close unwanted seam
on Apr 17, 2018 at 4:47:28 am

Apply Effects>Channel>Minimax to one of the layers.
Apply the following changes to the default:
Operation : Maximum
Radius : 1
Channel : Alpha

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http://www.broadcastgems.com/pathSlicer
- create highly customizable custom animated typefaces
- create amazing transitions
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- create burst effects
Do it all on a single Shape layer with minimal keyframes.

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Steve Bentley
Re: Alpha add does not work to close unwanted seam
on Apr 17, 2018 at 4:36:19 pm

You can also add an adjustment layer (with nothing on it) below the 3D layer giving you grief - this way you can keep the bottom layer 3D too. What this does is render everything below the adjustment layer and puts it into a 2D buffer, and then renders the rest of the stuff on top in 3D. Its a great way to have full 3D but separate layers that might intersect.
Its also great for making shadows as graphic elements on 3D planes below the object "casting" the shadows when you don't want to use 3D lights or if you are doing a perspective hack where any cast shadows wouldnt really angle correctly.



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Lan Lan Liu
Re: Alpha add does not work to close unwanted seam
on Apr 17, 2018 at 7:06:36 pm

Thank you Steve!

This WORKED! I have a ton of 3d layers and I put an adjustment layer on top of each like you said. And the seam is gone! Thank you! Now I don't have to rework my workflow :-)


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Roei Tzoref
Re: Alpha add does not work to close unwanted seam
on Apr 17, 2018 at 9:32:24 pm

Instead of adjustment layers to cancel 3D interaction, I prefer to add an inactive layer style to the layer by right clicking->add layer style. Choose anything and then simply check its visibility to off (for example "Drop Shadow" while leaving visibility on for "Layer Styles". So no additional layers. More elegant :)

Roei Tzoref
2D/VFX Generalist & Instructor
♫ AeBlues Tutorials ♫
http://www.tzoref.com


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Lan Lan Liu
Re: Alpha add does not work to close unwanted seam
on Apr 18, 2018 at 4:41:48 pm

Hi Roei,

Thank you for the great tip! Layer style is indeed more elegant and is easier to copy/paste/delete too. I noticed that it seems to render just a little bit slower probably because my computer is a bit old. I'm so happy to be learning so many tips. Thank you!


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Roland R. Kahlenberg
Re: Alpha add does not work to close unwanted seam
on Apr 18, 2018 at 12:30:17 am

I'm surprised Minimax didn't work. Did you try increasing the Radius value? Also, other than placing an Adjustment Layer and applying a Layer Style to break 3D interactions, a 2D Null Layer will do the same trick with less compute requirements.

PathSlicer - Advanced AE Shape Layer Effect
http://www.broadcastgems.com/pathSlicer
- create highly customizable custom animated typefaces
- create amazing transitions
- create cool lower 3rds and panels
- create burst effects
Do it all on a single Shape layer with minimal keyframes.

TypeGEMs - The Most Complete Type Tool Effect for AE
http://www.broadcastgems.com/typegems/

Intensive mocha & AE Training in Singapore and Other Dangerous Locations
Adobe After Effects CC ACE/ACI
BorisFX mocha Certified Instructor



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Lan Lan Liu
Re: Alpha add does not work to close unwanted seam
on Apr 18, 2018 at 4:49:07 pm

Hi Ronald,

Yes, I tried Minimax again on just one of the layers, and on all of the layers, and turning up the radius. It seems like somehow my problem has nothing to do with the alpha channel. I'm still trying to figure out why.

Thank you for the 2d Null layer suggestion! Yes I did notice slight slower rendering with layer style. Wow so many choices and great suggestions. Thank you!


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