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emitter        = scene.get_PB_Emitter("Circle01")
particles      = emitter.getParticles()
unfreezeObject = scene.getObject("Sphere01")
distThreshold  = 0.75
 
for particle in particles:
	particlePosition = particle.getPosition()
	objectPosition = unfreezeObject.getParameter("Position")
	particleObjectDistance = particlePosition.distance(objectPosition)
 
	if (particleObjectDistance <= 0.75distThreshold): particle.unfreeze()