Filter for Particle Trajectories
You can right-click a Particle Trajectories plot node to add a Filter subnode (), which controls the particle types to include and whether to render all particles or a subset of the particles. The Filter node has the following section:
Particle Selection
From the Particles to include list, select the particle types or subset to include in the particle trajectories plot:
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All (the default) to include all particles.
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Primary to include primary particles only.
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Secondary to include secondary particles only.
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Logical expression to include a subset of particles that fulfill the logical expression that you enter in the Logical expression for inclusion field. For example, pt.V>1 only includes particles with a velocity larger than 1, and x>0 only includes particles in areas where the x coordinate is positive.
From the Particles to render list, select an option for controlling how many particles to render:
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All (the default) to render all particles in the particle tracing simulation.
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Fraction to only render a fraction of the particles. You specify the fraction as a number between 0 and 1 in the Fraction of particles field. The default fraction is 1; that is, to render all particles.
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Number to only render a certain number of particles, which you specify in the Number of particles field. The default is to render 100 particles.