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Add the script to Simulation Flow (Ctrl/Cmd + F2) > StepsPre.

The script traces a particle's path by adding new particles. When a given particle limit has been reached the source particles will be deleted and no more trace particle will be added.

This script can only be used in conjunction with standard particle emitters, because the required "freeze()" command is not available for Dyverso and Hybrido.

Scene Preparation

  • Create a standard particle emitter of your choice ("Square", "Circle", "Triangle", "Sphere", "Cylinder", etc.) as the particle source.
  • Add a "Container" node to store the tracer particles.
  • Important: Use exactly the same "Resolution" for both emitters.
  • Set the emitter's "Type" to "Dumb".
  • Decrease "MAX substeps" to 20 under → Simulation options > General.
  • For better results add a "Noise Field" daemon and set its "Strength" to values around 3.
  • Display the "Container" node's particles as spheres: Container01 > Node Params > Display type > Sphere, and change "Size" to 0.015.

 

particleLimit  = 100000
sourceEmitter  = scene.get_PB_Emitter("Sphere01") # Change the name to the actual emitter's name, e.g. "Circle01" or "Bitmap01".
tracerEmitter  = scene.get_PB_Emitter("Container01")
nullVelocity   = Vector.new(0,0,0)
 
sourceParticles = sourceEmitter.getParticles()
tracerParticles = tracerEmitter.getParticles()
 
if (len(tracerParticles) <= particleLimit):
	for particle in sourceParticles:
	newParticle = tracerEmitter.addParticle(particle.getPosition(), particle.getVelocity())
	newParticle.freeze()
 
else:
	sourceEmitter.removeAllParticles()

 

 

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