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. Click the Replace Expression () button to select predefined expressions for the logical expression.
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.