Thanks Klonan, i found out how, heh, cheers

i went with

/c local surface = game.player.surface
local force = game.player.force
for chunk in surface.get_chunks() do
force.unchart_chunk({x = chunk.x, y = chunk.y}, surface)
end


yours sounds much cleaner
hope i used the right one

It's an ugly planet, a Bug planet! A planet hostile to life as we know- Starship Troopers

You're surounded, crash landed on a hostile planet deep in biter territory, fight off swarms of biters as you try to take a foot hold in this dangerous world, can you escape? can you survive..?

...
I consider ...

I've created a custom map, all done and ready to share, but when i go to play it it always starts fully revealed, how do i put the fog of war back in?

Thanks