Landscape

[luzi82]

oh my god~
is it a must to modify default grf in order to change the landscape?

[Storwin]

oh my god~
is it a must to modify default grf in order to change the landscape?

no, in fact it's a must no to, as any work based on the original grf's would be derogative works, and thus, copyright violations

[Archonix]

The phrase you're looking for is "derivative" works. Derogative means something very different.

[Korenn]

in other words, luzi,

in the past you had to, but not anymore. Nowadays the newgrf support for simple replacement graphics works fine, which means you don't have to alter the default graphics at all to change something.

[luzi82]

but it seems that I can change the buildings, the vehicle, but not the tile.
there are no "Action" in newgrf for me to change the sea, green land, etc...

[EDIT]
oh, it seems that action A can do, thx