how can I make basin area(river...swamp....lake)in terrain

Questions & Answers
1

I can make basin area if I hold down SHIF Ican lower but I can not make basin aria

http://img21.imageshack.us/img21/8792/mapunity.jpg

2

Under the Terrain options, you'll want to first set your default Height to something Higher than the Default "0". Then Raise the height over the entire level (something like 40 or 50 isn't bad, depending on how low you want the river or basin)

Then, when you use the Shift+Click, it'll lower the terrain into a river or lake or whatever shape you want. Then you can just lower the entire terrain down into the water, or raise the water up to the desired depth in the river.

So, in order to lower the terrain height (opposite of making mountains) you have to have a higher base terrain height.

4

Use the RaiseHeightmap script on the wiki to raise the entire heightmap, so that you have space to dig down.

3

The lowest possible point in your terrain will always be referenced as 0 internally. So you need to raise the rest of your terrain accordingly, so that your "ground level" has an internal height larger than 0, and the lowest point of your lake will have 0.