Occlusion culling error

I have tried the occlusion culling in a really simple scene and it works, but into a bigger scene it doesn’t.
Have you any idear about what it mean ?

your far view range is total out of scale I fear.
at such view ranges ie heavy outdoor occlusion culling is worthless and it will be hard to impossible to calculate due to the massive amount of RAM required to calc it, if it does not fail, as it happens here

So how much do you think i should change the Far Clip Plane ? I have just took the parameters from the bootcamp demo.

You need to set the far clip plane so that it is as near as possible while allowing the most distant objects in the scene to be visible. You can check the shape of the camera’s viewing volume by selecting it in the scene view. You will probably be able to make a good first guess like this but you may also need to tweak the distance if you find objects are not being rendered while playing the game.