In this section we will explore some techniques for visualizing volume data as a 3D object.

• To begin, restart ParaView or select Edit→Reset Session and change the Display setting for Coloring to be "Solid Color".
• Using File→Open, import the regular grid data set for this tutorial, RectGrid2.vtk.
• Click "Apply" in the Properties panel and make the data source node visible.

The data set extents are shown.

The data source file's ".vtk" ending indicates that it is formatted for the Visualization Toolkit, a C++ library that provides the underlying functionality of ParaView. You can see from the File→Open dialog box that ParaView also reads many other data formats.