Mask Points (MaskPoints)
Reduce the number of points. This filter is often used before glyphing. Generating vertices is an option.
The Mask Points filter reduces the number of points in the dataset. It operates on any type of dataset, but produces only points / vertices as output. This filter is often used before the Glyph filter, but the basic point-masking functionality is also available on the Properties page for the Glyph filter.

PropertyDescriptionDefault Value(s)Restrictions
Generate Vertices
(GenerateVertices)
This property specifies whether to generate vertex cells as the topography of the output. If set to 1, the geometry (vertices) will be displayed in the rendering window; otherwise no geometry will be displayed. 0

Only the values 0 and 1 are accepted.

 
Input
(Input)
This property specifies the input to the Mask Points filter.  

The selected object must be the result of the following: sources (includes readers), filters.

The selected dataset must be one of the following types (or a subclass of one of them): vtkDataSet.

 
Maximum Number of Points
(MaximumNumberOfPoints)
The value of this property indicates the maximum number of points in the output dataset. 5000

The value must be greater than or equal to 0.

 
Offset
(Offset)
The value of this property indicates the point in the input dataset from which to start masking. 0

The value must be greater than or equal to 0.

 
On Ratio
(OnRatio)
The value of this property specifies the ratio of points to retain in the output. (For example, if the on ratio is 3, then the output will contain 1/3 as many points -- up to the value of the MaximumNumberOfPoints property -- as the input.) 2

The value must be greater than or equal to 1.

 
Random
(RandomMode)
If the value of this property is set to 0, then the points in the output will be randomly selected from the input; otherwise this filter will subsample regularly. Selecting points at random is helpful to avoid striping when masking the points of a structured dataset. 0

Only the values 0 and 1 are accepted.