Graphics Reference
In-Depth Information
• Preparing live action imagery for integration with CG
• Replacing live action elements with CG
• Compositing
• 2D-to-3D Conversion
Regardless of the particular techniques used or if the work is creative or
corrective, the primary objective of 3D visual effects work is integrating
depth, geometry, color and other key attributes of the live action shot into
the CG world and vice versa. Whenever possible, visual effects teams should
have reference imagery already corrected and graded in terms of depth,
geometry and color. In some cases additional 3D metadata such as focus,
iris, zoom, IA and convergence angle may be available. Visual effects teams
need corrected imagery and metadata for reference so that they can do their
best work technically and creatively.
We include in the Visual Effects workl ow graphic elements such as main
title sequences, “lower-thirds, “bugs,” end credits and any graphics that
appear as part of the visual story. Just as teams need to create CG elements
that appear properly in Z-Space over time, 3D teams also need to position
graphics Z-space without interfering with live action footage (and vice
versa).
The problem is that the visual effects elements themselves can lead to
discomfort or discontinuity when combined with live action imagery. Some
of the most common 3D visual effects issues (i.e., situations that result in
viewer discomfort and/or discontinuity) include:
• interference between CG and native element in Z-Space
• perceived l atness of CG elements
• unrealistic motion of CG in Z-Space
“In terms of visual effects, you need to get in touch with them the
right way to see what they need from us to get their shots. We
need to consider capture formats of course. But we also need to
consider metadata. What metadata streams does the client want?
How fast do they want it? All of those logistical things which are
usually easy to address as long as you know about them in advance.”
—Ted Kenney
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