Dotted surfaces

This is DDT.

Jmol has the ability to show two types of 'dots' surfaces. The first is a van der Waals dots surface, where the dots are shown at the van der Waals radius for all atoms. The second type of dots surface you can display is a Connolly or Solvent Accessible Surface, formed when a probe sphere (representing the solvent) is rolled over the surface.

dots surface: