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Background Object & AAE Compositing
Hi everyone,
I have a scene that has one of those almost white limbo looks to it. It consists of a plane for the floor with a compositing tag and compositing background checked. The plane also has a material with a white to gray gradient that is 2D circular. The material tag on the plane is set to frontal for the projection.
My scene also has a background object with the same material that I used for the plane. No compositing tags are added to the background object.
I also have some text and a Poser figure in my scene. I gave my Poser figure an object buffer so I can add a little color to him when I do my After Effects work.
My problem is that when I do a multipass render with a compositing project file for After Effects my background object is all black in After Effects. My multipass consists of all image layers along with my object buffer and RGBA.
How can I get my background object to show up in After Effects? I’ve tried giving my background object a compositing tag and checked compositing background but that didn’t help.
The strange thing is that when I watch it render in the picture viewer I can see my background object. But when I look at the background layer in the picture viewer it’s not there.
Thanks,
Eric -
5 Replies
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You should have a pass called “background”. If you render an alpha (render settings>save>alpha) you can use it as a luma matte to knock out everything but the background.
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Adam, thank you for the reply and taking the time to help me.
I looked in my render settings for a Multi-pass called “background” and I don’t have it. I looked in every single setting for “background” or any reference to background and I didn’t see anything.
When I look in the layer tab in the picture viewer I do see a layer called “background” but the eye is always closed when I render and it never renders out a layer called background.
I did a render with an alpha channel but I’m not really understanding what I need to do as far as render settings go.
In the “save” settings I have save to file unchecked. Alpha channel and Straight Alpha checked. In multi-pass I have Straight Alpha checked and I’m also saving to a compositing project file for After Effects.
I’m totally not understanding what I need to do to get my background object to show up in After Effects.
Thanks again Adam,
Eric -
I guess what you need to do is save out the full render and then use the alpha (inverted) as a luma matte to bring in the background.
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Thanks for the quick reply Adam!
I saved out the full render as a TIFF file with alpha channel checked and straight alpha checked. I saved my multi-pass as a PSD with alpha channel check.
Now when I open up my compositing file in After Effects I drop my RGBA file to the bottom of the layer stack and then drop my full render below that. I then turn on Alpha Inverted Matte on the full render. My background does show up but I have a white line where the plane meets the background object. And anything in front of the background object (like my text and Poser figure) is ruff looking like it doesn’t have any anti-aliasing. I tried to use a simple choker but it only made things look worse.
I’ve only been using multi-pass and luma matte’s for a couple of weeks now so I’m still learning 🙂
Thanks,
Eric -
Im having this same issue as this guy? Seeing the white line? What is the way to do this and not get the white line?
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