NAME
     AddSurface - add surface

SYNOPSIS
     AddSurface expr ( vdw | solvent | contact ) expr
	 ( dots | shaded ) ( 0 | 1 )

DESCRIPTION
     Add a surface for the selected atoms. The precision
     (density of the dots) depends on DrawPrec.

     The first argument is the radius of the atoms, you
     will normally not change the default value 'vdw'.

     The second argument gives the type of surface:

	 vdw: van der Waals surface

	 solvent: surface given by the center
	     of spheres (solvent) touching the atoms

	 contact: contact surface (Richards)

     The third argument gives the solvent radius for
     solvent and contact surfaces.

     The fourth argument gives the type of surface,
     dots or a solid, shaded surface can be selected.

     The final option selects whether a report with the
     approximate areas and volumes of all surface parts
     is desired. The volumes are mainly interesting for
     cavities. Note that the numbers are not highly
     precise.

     Depending on the precision, shaded surfaces can use
     a lot of memory. If the machine runs out of memory,
     the program may crash occasionally.

     This command supports groups for shaded surfaces,
     the resulting surface will belong to the first
     group member.

EXAMPLE
     AddSurface vdw contact 1.4 dots 0

SEE ALSO
     SelectAtom, RadiusAtom, DrawPrec, Group,
     ColorPrim, RemovePrim, CalcSurface

DATE
     970723
