The INI value is the maximum radius in EAW points, of the model. Say a model is 400 long by 500 wide, and 50 high, it's INI value would be 500.
It's important though, to have this figure slightly larger than the exact value, because on the larger screens it's possible to things disappear before they leave the screen. So, I would allow a further 25%, the actual maximum radius, to cover these small annoyances.

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Ah that's much better!
Wings Over BytomAt home, with my great kids, Thomas, Jessica & little Nicola.