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====== CreateSandInAreaRand ======
CreateSandInAreaRand(<-area <-sandDef <-probability)

===== Description =====
Creates sand of sandDef type in the area. Area is a V4 that specifies the lower left and upper right coordinates of a region. Probability is a float in the range of 0 to 1 indicating the probability of any cell in the area being filled with sand.

===== Examples =====
<code 4rpl>

CreateSandInAreaRand(V4(0 0 512 512) 1 0.25)
#Replaces approximately one in four pixels of sand in the entire map with stone

</code>