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. Volumetric
lighting effects, such as light rays and glows, are susceptible to
two common problems: They can look too synthetic, and they are prone
to banding when compressed for DVDs and the web. In Motion: Natural
Light Effects, Chris Meyer shows how to make light look more realistic
by adding dust or swirling smoke, creating natural imperfections that
help with compression. He demonstrates how to do this using stock
footage of this natural phenomenon or Motion's Particle Emitters.

http://www.lynda.com/home/DisplayCourse.aspx?lpk2=46820

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