Creates dust effects.

Required parameters:

- none

Optional parameters:

- pos = x_pos, y_pos (int)
  Specifies the position that the dust should be drawn at, relative to the player's axis. Defaults to 0,0.
- pos2 = x_pos, y_pos (int)
  Specifies the position to simultaneously draw a second dust cloud at. If omitted, the second dust cloud is not drawn.
- spacing = value (int)
  Determines the number of frames to wait between drawing dust clouds. For instance, spacing = 3 (the default) will draw a new cloud of dust every third frame. spacing should be 1 or greater.

Example:

`none`