Finally, it was driver problems. With the last version of drivers unistalled and the new installed, now Outerra run perfectly as in the previous version, with the right bright and constrast.
Very nice improvement. Thank you guys.
I think that now having trees system (it will be improving for sure from here), now we need a system of little bushes because in the places where no trees, the ground is too empty, and the green is not enough.
In this system we can have some diferent bushes for diferent colours of terrain. So in the same area, green for example, we can have 2 or 3 diferent bushes who change also size.
And in red terrains like gran canyon another types. Same with yellow desertic terrains, etc.
Those bushes can cover some part of the terrain strategically placed and diversified. And if the system is good made, it will be the thing which will add the total real aspect to the engine.