Hi guys, I’ve run into a problem while exporting an animation that I motion-tracked to imported footage. The basic idea is to export all the elements created in Blender (all objects, shadows, ambient occlusion) on an alpha channel so that I can composite them onto footage in After Effects. I’ll be compositing them onto the same footage I took the track from using Blender, but would rather do the compositing in After Effects for a few different reasons.
However, I can’t work out a way to export the animation with a transparent background. All my attempts end with the either a solid white background or the original movie clip in the background. Is there a way to replace the movie clip background or white space with solid transparency, so that I can overlay the other elements later?
Sorry if that doesn’t make a lot of sense, it’s a little tricky to explain. Here’s the blend file, and here’s a screencap of my compositor in Blender.
The compositor pictured here is untouched since I started working on the scene.
I’d really appreciate some help on this, I’m planning on using Blender a lot more for filmmaking if I can get this right. Is there something obvious I’m missing?