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출처 : http://gpac.sourceforge.net/tutorial/bifs_part2.htmWe will now introduce animation to bring some life in the scene. BIFS offers two ways of animating a scene: using value interpolators and events generators as in VRML, or using live modifications by adding, removing or updating nodes in the tree through command or animation frames (encoded in a file, sent by a server).Interpolator based ani..

http://gpac.sourceforge.net/tutorial/bifs_part1.htmIn this first part, we will explain the MPEG-4 Scene structure and show how to create very simple scenes with basic geometric shapes such as rectangles, circles.Empty Initial Scene:Here is an empty MPEG4 document (vide.xmt, vide.bt) where you will have to, throughout the tutorial:change pixelWidth and pixelHeight values to modify the scene size ..