the best choice of data formats

[Terry]

I've a scene which was build by autodesk 3ds max9,the saving output file *.max size is 40MB,.obj file exported by max size is 400Mb+,I thought it's a little bigger.I would like to know which format is suggested by irrlicht group in all kinds of 3d format?

Thank you!

[pera]

models for games should have small triangle count.
render loop - FPS.

Making scenes in 3DMax for one time rendering is another story.

[3D Ace]

You should split all objects into individual meshes. Reuse meshes wereever possible without it looking obvious and reduce the poly count as much as possible without loosing visible quality.
That's a basic guide to creating meshes for 30fps+ realtime rendering.