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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.
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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.
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