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Method: a "run once" script and a TimeSensor
#VRML V2.0 utf8 Group { children [ DEF enterWorldTimeSensor TimeSensor { cycleInterval 1 enabled TRUE loop TRUE startTime 1 stopTime 0 } DEF enterWorldScript Script { eventOut SFTime startTime eventOut SFBool firstTime eventIn SFTime triggerIn url "vrmlscript:function triggerIn(value, time) { // fires exactly once by shutting off TimeSensor startTime = value; firstTime = FALSE; }" } ] } # firstTime gets set to FALSE which disables TimeSensor ROUTE enterWorldScript.firstTime TO enterWorldTimeSensor.set_enabled ROUTE enterWorldTimeSensor.time TO enterWorldScript.triggerIn