09-02-2006, 07:15 PM I would stick with Collada. It's an open standard, supported by many tools, and it's extensible. X files are binary, difficult to work with and not as widely supported. OBJ is a decent alternative, but it doesn't support animation or other extended features.
Stick with Collada, and you can always convert to other formats if you need to.
09-02-2006, 08:23 PM If you're building a game engine for use with the Unreal Engine, then you may want to consider using the Unreal Engine's own file format. This format is called the Unreal Package format, and it's used to store all kinds of data in the Unreal Engine.
The Unreal Package format is a binary format, and it's optimized for fast loading and efficient use of memory. It's also extensible, so you can add your own data types to it if you need to.
If you're not building a game engine specifically for use with the Unreal Engine, then you may want to stick with Collada, since it's an open standard and widely supported.
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