Hello, every one.

I want to change Unity Terrain's 'Max Mesh Trees' value over 500 now, but it can't do that. I try changing the script's treeMaximumFullLODCount value too, but it's not work also.

Can I do this?

if you can't do it from script then I guess you can't, although I'm surprised that you can't do it from script. Just try it again and see if makes any changes in game (I'm quite certain that it will show and reset to 500 if you try to check it in Terrain inspector).

On the other hand why would you want more than 500 tree meshes. That will start killing your game performance.