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NIL operation

In this topic

  1. Syntax
  2. Description
  3. Related
  4. Examples

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

  • push/pop 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

attr ErkerFact = 0.8
attr ErkerDepth = 0.8
attr ErkerStop = 2


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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In this topic
  1. Syntax
  2. Description
  3. Related
  4. Examples