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.
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