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NIL operation—ArcGIS CityEngine Resources | Documentation

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NIL operation SyntaxNILDescriptionThe 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.Relatedpush/pop operationExamplesUsing NIL to create holes Lot--> extrude(10) split(x){ { ~1 : X | ~1 : NIL }* | ~1 : X } NIL creates holesUsing 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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