A height field displays data values as colors for a 2D grid, a 2D orthogonal slice of a uniform 3D grid, or along a 2D curvilinear lattice. The data magnitude is also depicted by the amount of displacement above or below the slice. The displacement is perpendicular to the plane or curvilinear lattice and is adjusted by the scale factor. 

The height field displays data values from an orthogonal slice 
through a 3D grid. The height field opacity is set to be partially 
transparent to view the underlying contours the slice.