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| There are multiple ways of probing a data set for point or cell values. The simplest
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| is the Probe Location filter. Additionally, there are a variety of filters
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| to plot data with respect to time, location, or grid object Id.
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| === Probe Filter ===
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| The probe filter can be used to query a data set for point or cell data.
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| Options for the probe filter are:
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| * Show point button is used to show where the center of the sphere is for generating the probe points.
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| * Center on bounds will place the sphere center at the center of the data set's bounds.
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| * The sphere center can either be set in the properties tab of the object inspector or in the 3d view with the mouse cursor. To choose a new point in the 3d view window, press P and then click on the desired point. Note that the Show Point option must be selected in order to activate the point widget.
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| The output for this filter is a single cell comprised of a set of points in a vtkPolyData.
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| == Line Plots ==
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| The line plots have similar control functionality for displaying the results.
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| These options are in the Display tab of the Object Inspector and include selecting
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| which point and/or cell data to include in the plot, what should be used as the
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| x axis values (e.g. point/cell index or a specified point or cell data array),
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| and plot preferences such as line thickness and marker style.
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| === Plot Data / Scatter Plot ===
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| The Plot Data filter and Scatter Plot filter are very similar in functionality
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| with the Scatter Plot filter being a deprecated version of the Plot Data filter.
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| The main difference is that the Scatter Plot filter's output is a 1D rectilinear
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| grid while the Plot Data filter's output is the same type as the input.
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| The Plot Data filter plots point or cell data over the entire data set. By default
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| the x axis values are determined with respect to their point or cell index.
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| === Plot Over Line ===
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| The Plot Over Line filter is used to plot point data over a specified straight line.
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| The Plot Over Line filter will not display cell data over the line so the user can use the
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| Cell Data to Point Data filter to convert cell data to point data in order to use this filter
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| for viewing desired cell data.
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| The line geometry can specified either by setting the points in the Properties tab
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| of the Object Inspector or by pressing P and selecting the beginning and ending points
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| of the line. Note that the Show Line option must be selected to activate the line widget.
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| The resolution option is used to specify at how many evenly spaced points on the line to query
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| the data set for information the point data to plot with respect to.
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| === Plot on Sorted Lines ===
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| The Plot on Sorted Lines filter is used when polydata with line cell types have been extracted from
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| a data set and the user wants to see how point data varies over the line. This filter orders the
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| lines by their connectivity instead of their point index. The output of the filter is a multiblock
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| with a block for each contiguous line.
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| === Plot on Intersection Curves ===
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| The Plot on Intersection Curves filter is used to plot point data where the data set
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| intersects the given polygonal slice object. The results is a multiblock of
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| polydatas where each block represents a contiguous set of cells. Note that the
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| polydatas will only have 1D cell types. Thus if the slice type object intersection
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| with the data set has 2D geometry the filter will take the boundary of the slice
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| type object in order to reduce down to 1D geometry. If the slice type is a sphere which
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| is wholly contained in a volumetric data set then the filter parameters are invalid
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| and no lines will be output.
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| === Plot Selection Over Time ===
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| The Plot Selection Over Time filter can be used to visualize the variation of
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| point or cell data from a selection with respect to time.
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| The selection should be made on the data set of the filter that
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| precedes the Plot Selection Over Time filter in the pipeline in order
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| to ensure that the proper points or cells are selected.
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| Note that information for only a single point or cell can be plotted at a time.
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| === Plot Global Variables Over Time ===
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