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1. Re: Mask Out Multiple Layers in 3D?
Mylenium Jun 9, 2014 10:34 PM (in response to NickBoston)Dolly/ slide shots change the parallax and the 3D tracker is trying to pin the shot to a fixed plane, hence it shifts around as the camera moves. That's really not easy to resolve, especially since you can't calibrate the 3D tracker in AE and use manual reference points. Rather than doing this in 3D, you might try a "simple" planar 2D track in mocha with rotation and scaling or a corner pin.
Mylenium
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2. Re: Mask Out Multiple Layers in 3D?
NickBoston Jun 9, 2014 10:45 PM (in response to Mylenium)Thanks for the reply Mylenium,
But I'm not having issues with tracking. The tracking is coming out fantastic. Nothing is slipping or anything even with slider and glidecam etc. Essentially, I can't mask out multiple layers as one unit. The mask doesn't "stick" in the 3D space. BUT, it does just perfectly when I use just one photo.
My hope is to find a way to treat all those PSD layers I used for the projection like one of the single 3D tracked photo that I've been doing for the rest of the project and mask it out like the others. Pre-comping did nothing along with a pre-comp with the 3D button ticked.
A 2D Mocha track is an idea. But, my fear is unless it's not a 3D solve then it might not be enough in just 2D with the amount of parallax in the shot.
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3. Re: Mask Out Multiple Layers in 3D?
Rick Gerard Jun 9, 2014 11:11 PM (in response to NickBoston)Here's what you have to do. First, make sure that you do not have the Ray-traced renderer turned on. Second, pre-compose your multiple layers. Third Collapse transformations. Fourth, add a new 3D layer using a red or blue solid with the blend mode set to screen and position this layer so that it will cover the entire pre-comp. Now, and this is the reason for the screen blend mode, use the pen tool to draw your mask on the layer then set the layer as a track matte for the pre-comp. Animate the matte and you're done.
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5. Re: Mask Out Multiple Layers in 3D?
Rick Gerard Jun 10, 2014 12:00 AM (in response to NickBoston)No, do not include the 3D camera. You need to keep the 3D camera in the shot so the Mask layer will move with the camera. The mask layer should be just in front of the projection layer you have that is closest to the camera. You are only pre-composing the 'projection' layers to group them so you can use one track matte for all layers. Without the camera left in the original comp you are essentially replacing the camera created with the camera tracker with the default Active Camera so none of your tracking info is being used.
I wouldn't call this projection mapping. It is more like matte painting because you are painting an element in a shot that wasn't there. Calling it projection mapping confused me for a bit.
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6. Re: Mask Out Multiple Layers in 3D?
NickBoston Jun 13, 2014 11:12 PM (in response to Rick Gerard)Hey Rick, it took me a bit to figure out how to achieve what you're saying. It works I'm happy to report. And I definitely learned something new here as I have never really worked with track mattes before! But, why is it so cumbersome to mask out multiple layers as one?
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7. Re: Mask Out Multiple Layers in 3D?
NickBoston Jun 14, 2014 10:20 AM (in response to NickBoston)And, does using a solid of either red or blue make a difference when using mattes?
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8. Re: Mask Out Multiple Layers in 3D?
Rick Gerard Jun 14, 2014 12:16 PM (in response to NickBoston)I just pick a color that I can see through and that contrasts with the background I'm trying to mask when the solid is set to screen. On some footage I use multiply. It all depends on the footage.











