GET_NORMAL
THE BOX'S MAIN HELP:
This returns the normal in the MAP file at the location (X,Y). MAP is the filename of the map file. X is the x coordinate of the location into the map. Y is the y coordinate of the location into the map.
MAP (input):
This must be the path of a vector image file. Default is empty.
X (input):
This must be a scalar. Default is state->raster_x. This is the x coordinate of the location into the map.
Y (input):
This must be a scalar. Default is state->raster_y. This is the y coordinate of the location into the map.
N (output):
This is the normal returned.