Append Geometry (AppendPolyData)
Takes an input of multiple poly data parts and output has only one part.
The Append Geometry filter operates on multiple polygonal data sets. It merges their geometry into a single data set. Only the point and cell attributes that all of the input data sets have in common will appear in the output.

PropertyDescriptionDefault Value(s)Restrictions
Input
(Input)
Set the input to the Append Geometry 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): vtkPolyData.