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NIL operation

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    Syntax

    • NIL

    Description

    The NIL operation deletes the current shape from the shape tree. It can be used, for example, to create holes in split operations or to terminate recursive rules.

    Related

    • pop / push operation

    Examples

    Using NIL to create holes

    Lot-->
   extrude(10) 
   split(x){ { ~1 : X 
             | ~1 : NIL }* 
           | ~1 : X }
    		NIL creates holes

    Using NIL to stop a recursion

    Lot-->
   extrude(10)
   X
   comp(f) { all : Erker }
	
Erker-->
   case(scope.sx > ErkerStop) :
      s('ErkerFact, 'ErkerFact, 0)
      center(xy)
      alignScopeToGeometry(yUp, 0)
      extrude(ErkerDepth)
      X
      comp(f){top : Erker}
   else:
      NIL
    		NIL stops recursion

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