I played a bit with near & far clip OB3D attributes.
We can use them on .. each visual object and on the camera too.
Used on the camera, it is more global.
In my system, I have to evaluate all distances relative to cam, so I can (and I have to) activate/inactivate OB3D visual objects depending on distance. This improves performances
But what are the benefits of near & far if they "only" provide a way to visually hide & show things between 2 distances values without having any impact over activation & inactivations of visual object in the context ?