Filter for Point Trajectories
You can right-click a Point Trajectories plot node to add a Filter subnode (), which controls the points to include and whether to render all points or a subset of the points. The Filter node has the following section:
Point Selection
From the Points to include list, select the points or subset to include in the point trajectories plot:
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All (the default) to include all points.
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Logical expression to include a subset of points that fulfill the logical expression that you enter in the Logical expression for inclusion field. For example, x>0 only includes points 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 points in the point trajectories plot.
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Fraction to only render a fraction of the points. You specify the fraction as a number between 0 and 1 in the Fraction of points field. The default fraction is 1; that is, to render all points.
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Number to only render a certain number of points, which you specify in the Number of points field. The default is to render 100 points.