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====== SetTerrainInRange ======
SetTerrainInRange(<-cellX <-cellZ <-minTerrainHeight <-maxTerrainHeight <-radius <-isSquare <-fillRatio)

===== Description =====
Sets the heights of the terrain within the radius of specified integer map coordinates.  A value of 0 for terrainHeight means "void" or no terrain.
If the min and max heights are different, a random height will be chosen in the range from [min,max].
The isSquare parameter is a boolean indicating where to fill terrain in a square (true) or a circle (false) from the specified coordinates.
The fillRatio is a float in the range [0,1]. A value of 1 means to change the height of every cell in range.  A value of 0 means to
do nothing.  Values in between will affect a partial amount of terrain cells in range.

Note: Changing the terrain will cause the terrain to redraw and nearby units to recalculate line of sight and other data.

===== Examples =====
<code 4rpl>
SetTerrainInRange(42 23 5 7 20 false 0.5)
</code>
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