Spawns sand particles from the player's sand inventory. Used by Duster.

Arguments

zerog_xoffset (int)

X offset in map pixels of pixel spawn zone used when sand gravity is 0

zerog_yoffset (int)

Y offset in map pixels of pixel spawn zone used when sand gravity is 0

zerog_width (int)

Width in map pixels of pixel spawn zone used when sand gravity is 0

zerog_height (int)

Height in map pixels of pixel spawn zone used when sand gravity is 0