The trend in visual effects today is an ever-closer integration of digital compositing with the CGI production pipeline. Compositing software is continuously evolving in the direction of more and more support for CGI issues, so the modern digital compositor needs not only to understand how to composite CGI, but a good understanding of CGI itself. In this chapter we will start by taking a look at the composite of a CGI element with its background to introduce the concepts of the foreground layer, the matte (or alpha), the background, and how they go together to create a basic CGI composite. In subsequent sections we build on this to introduce the ...
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