Up: Rendering methods
The `Orbital' representation draws a molecular orbital isosurface
corresponding to a user-defined wavefunction amplitude computed on a
regularly spaced grid, resulting from the selected wavefunction type,
spin, excitation, and orbital index. The size parameter controls the
thickness of points and line isosurface representations, and the grid
spacing parameter controls the density of the regular grid upon which
the wavefunction amplitude is computed.