anchor.diff:  
   //do not use, use queue_smooth(atom)
   /proc/smooth_icon(atom/A)
  -	if(!A || !A.smooth || !A.z)
  +	if(!A || !A.smooth)
  +		return
  +	A.smooth &= ~SMOOTH_QUEUED
  +	if (!A.z)
   		return
   	if(QDELETED(A))
   		return
  
positive.code: 
  //SSicon_smooth
  /proc/queue_smooth(atom/A)
  	if(SSicon_smooth)
  		SSicon_smooth.smooth_queue[A] = A
  		SSicon_smooth.can_fire = 1
  	else
  		smooth_icon(A)
  
  //Example smooth wall
  /turf/closed/wall/smooth
  
negative.code: #define N_SOUTHEAST	64
  #define N_SOUTHWEST	1024
  
  #define SMOOTH_FALSE	0	//not smooth
  #define SMOOTH_TRUE		1	//smooths with exact specified types or just itself
  #define SMOOTH_MORE		2	//smooths with all subtypes of specified types or just itself (this value can replace SMOOTH_TRUE)
  #define SMOOTH_DIAGONAL	4	//if atom should smooth diagonally, this should be present in 'smooth' var
  #define SMOOTH_BORDER	8	//atom will smooth with the borders of the map
  #define SMOOTH_QUEUED	16	//atom is currently queued to smooth.
  
  #define NULLTURF_BORDER 123456789
  
  