Add a Filter () node from the Datasets menu to create a dataset that filters data from another dataset using a lower or upper bound or both a lower and an upper bound. You also specify the expression that specify what part of the data that you want to filter. It is also possible to use a Filter dataset as the source for a mesh import (see Import). It is then the result of the evaluation of the Filter dataset that is used.

Click the Plot button () to visualize the filter dataset in a plot.

From the Dataset list, select a dataset that contains the data that you want to filter.

Enter or choose an expression for the quantity for which you want to apply a filter. See Common Results Node Settings for links to more information about the Expression section.

From the Bounds list, choose the bounds for the filtering of the expression: Lower (the default), Upper, or Lower and upper. Depending on the chosen bounds, enter values for the bounds in the Lower bound and Upper bound fields.

Select a Geometry level: Taken from dataset (the default), Volume, Surface, Line, or Point. The default means the highest geometry dimension for the data in the dataset: typically volumes in 3D, surfaces in 2D, and lines in 1D. Select the Propagate to lower dimensions check box to make a geometry level of volumes, for example, also include their adjacent surfaces, lines, and points.

Select a data Smoothing method — None, Inside material domains (the default, for smoothing within domains shared by the same material but not across material boundaries), Inside geometry domains (for smoothing within each geometry domain but not across interior boundaries), Everywhere, or Expression. If you choose Expression, enter an expression in the Expression field such that smoothing occurs where the expression is continuous. The default expression is dom, the domain variable, which is equivalent to the Internal smoothing. You can also — in a surface plot, for example — use material.domain, which is an indicator variable for domains that share the same material (see Material Group Indicator Variables) and is equivalent to the Inside material domains setting. For all Smoothing methods except None, you can also choose smoothing threshold, if needed. From the Smoothing threshold list, select None (the default), or select Manual to enter a relative smoothing threshold value (default: 0.1) in the Threshold field. The Use derivatives check box controls whether cubic (Hermite) interpolation is used when applying the filter and is selected by default.