Join Chris Meyer for an in-depth discussion in this video Projecting Video, part of After Effects: Light Transmission.
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This movie demonstrates the core technique for how you project one layer onto…other layers inside After Effects. To do so, you'll have to learn how to cast…shadows and then use the Light Transmission parameter to project the image…rather then just a black shadow. In the previous movie we created the simple 3D…room with a wall and a floor and added to it a 3D layer of a video that we'd like…to project onto this back wall.…To do that, we're going to start playing up with lights. So I'm going to add…Layer > New > Light and then we'll set up a couple things in Light Settings…before I get going. First, I'll change my Name to projection light so I can…keep track of it. We'll play with different light types here in a minute.…
I'm going to start with a Spot. I'll use the default intensity of 100.…I am going to enable Casts Shadows, very important, because this process relies…on shadows. I'm going to keep these defaults of Shadow Darkness of 100% so that…I have a full screen projection and Shadow Diffusion of 0. We're going to play…
Projecting one 3D layer onto another is useful for creating film and video projections as well as stained glass effects. In After Effects: Light Transmission, instructor Chris Meyer demonstrates the required steps, including mastering shadows and the Light Transmission parameter. He teaches numerous tips and tricks for building 3D worlds (including using seamless tiles), grouping together layers and lights, softening or sharpening projections, and using "negative light" to remove unwanted light leaks from a scene.