ADOBE AFTER EFFECTS: Forum Expressions Tutorials Creative Cloud

Align 3D After Effects items with 3D render

COW Forums : Adobe After Effects

<< PREVIOUS   •   FAQ   •   VIEW ALL   •   PRINT   •   NEXT >>
Andrew HainenAlign 3D After Effects items with 3D render
by on Aug 14, 2012 at 2:56:28 pm

I'm not entirely sure what this would be called, or if I'm doing the right process and I'm just not good at it.

After I animate something in 3D (currently using Luxology Modo 601) and then I render out the flat PNG image sequences, there's certain 3D elements I'll animated alongside in After Effects. So, if I animate a camera panning past buildings in 3D, but the trees in the background are 2D (3D items in After Effects) and I try to make them align/map properly.

First off, I don't know what that's actually called, just compositing 2D and 3D elements? More importantly, it's complete guesswork trying to make a 2D item try and fit in with a 3D render, and I'm just going along trying to match it by guessing with Orientation/Position/Rotation.

So, lets say I render out a 3D rotating building, and I want like a 2D logo rotating around it the same (but the 3D on the logo has been done in After Effects, not Modo) is there a simpler way to do this? Is it guesswork, lots of time?

Similar to this video https://vimeo.com/27194571 (around 3-4 seconds in), there is a magazine spinning, and 2D elements around it. The 2D elements feel like they've been matched right with the magazine, but done in AfterEffects. Again, I'm wondering if there's a name for this or what not.

*I've read CreativeCow forums for years, but brand new member as of today, so I apologize if I've posted this in the wrong location.


Return to posts index

Walter SoykaRe: Align 3D After Effects items with 3D render
by on Aug 14, 2012 at 3:27:20 pm

The best way to do something like that is to get as much of the 3D data from your 3D app into After Effects as possible. Even though your renders will always been flat 2D layers, you want to bring over camera data and object position data so you can match Ae's 3D space to your Modo scene's 3D space. This way, you can position elements in Ae in 2.5D, it it will react to the same camera as is in your Modo scene, so you never have to guess about position, orientation, rotation, etc.

I'm not a Modo user, but a quick Google search turned up AfterFxIO by Frederik Stenson, available here:
http://www.modo.stenson.tv/

The only remaining challenge is dealing with correct depth overlapping during compositing; this is done somewhat manually in Ae using object buffers, which are per-object grayscale alpha mattes (perhaps via Surface IDs?), as luma mattes.

A lesser solution would be to run your renders through a 3D tracker -- a quick search on this forum about 3D tracking should be informative.

Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
RenderBreak Blog - What I'm thinking when my workstation's thinking
Creative Cow Forum Host: Live & Stage Events


Return to posts index

Andrew HainenRe: Align 3D After Effects items with 3D render
by on Aug 14, 2012 at 3:32:06 pm

Perfect, thanks so much for the response. I'm trying out both options, really appreciate it!


Return to posts index


Walter SoykaRe: Align 3D After Effects items with 3D render
by on Aug 14, 2012 at 6:08:42 pm

Good luck, Andrew.

I'd love to hear back if that script works out -- it could be useful for future Modo users who search this forum. Thanks!

Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
RenderBreak Blog - What I'm thinking when my workstation's thinking
Creative Cow Forum Host: Live & Stage Events


Return to posts index

Andrew HainenRe: Align 3D After Effects items with 3D render
by on Aug 14, 2012 at 6:19:35 pm

Alright, so just tried it with two different files, and it works pretty darn well. The only issue I had with it (and it could entirely be from me being a noob and not adjusting something proportionately) was getting the 2D item to be in same 3D position as the null object I exported from Modo. The item is aligne perfectly to the camera, but I had to mess around with the anchor point to get it to line up. Otherwise, it couldn't be simpler, and the guy has a video that walks right through the whole process.

In modo, it was giving me an error that the film back didn't match the frame size. Was simple enough to adjust (by changing the Film Back setting in Modo). I'm assuming you can get it to work with any frame size, but I'm not sure if me using a non-standard video size (it was like 1344x732 or something odd) was causing that to happen. I switched it to 720x480 frame and it went through fine.

I didn't get a chance to try out and 3D trackers, but after work I'll give that a shot too.


Return to posts index

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
© 2017 CreativeCOW.net All Rights Reserved
[TOP]