doc.arcgis.com/en/cityengine/2025.0/cga/cga-isnull-function.htm

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      isNull function—ArcGIS CityEngine Resources | Documentation
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      isNull function Syntaxbool isNull(value)bool[] isNull(values)Parametersvalue—floatvalues—float[]Returnstrue if value is set to the internal special float or string value which represent NULL or "missing value"; false otherwise.For floats, NULL is encoded as nan. For strings, NULL is encoded as "\ue000". For an array values a new array is returned containing the result of each element.RelatedExamples isNull("CityEngine") # result = false isNull("\ue000") # result = true isNull(ln(-1)) # result = true isNull(["CityEngine", "\ue000"]) # result = [false, true]

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