Volume visualization of electron density for PDB 1okyVolume panel for the 1oky volume example. It has the iso-levels on the x-axis and the opacity (1.0 - transparency) on the y-axis.
Volume creates a new volume object from a map object. The data (3D scalar fields) are shown as a true 3D object using coloring and transparencies defined by the user to illustrate the data values.
This technique supports single and multiple isosurfaces.