COMSOL Multiphysics™

geomcsg
Out specifies the output arguments from geomcsg. The outputs stx, ftx, ctx, and
ptx correspond to st, ft, ct, and pt but contain more detailed information about
the geometric entity relations.
stx is a cell array of matrices similar to st. Each matrix contains the relation
between subdomains in each solid object in the inputs, and the final subdomains in
the output g.
ftx is a cell array of matrices similar to ft. Each matrix contains the relation
between face segments in each solid object and face object in the inputs, and the
final face segments in the output g.
ctx is a cell array of matrices similar to ct. Each matrix contains the relation
between edge segments in each solid object and curve object in the inputs, and the
final edge segments in the output g.
ptx is a cell array of matrices similar to pt. Each matrix contains the relation
between vertices in each solid object, face object, curve object, and point object in
the inputs, and the final vertices in the output g.
Sf represents a set formula with variables names from ns. The operators +, ∗, and
− correspond to the set operations union, intersection, and set difference,
respectively. The precedence of the operators + and − are the same. ∗ has higher
precedence. You can control the precedence with parentheses.
Ns is a cell array of variable names that relates the elements in sl to variable names
in sf. Each element in ns contains a variable name. Each such variable assigns a
name to the corresponding solid object in sl. This way you can refer to a solid
object in sl in the set formula sf.
Geometry Model
The geometry model fem.draw contains the following fields:
TABLE 1-57: GEOMETRY MODEL OR DRAW STRUCTURE
FIELD 1D 2D 3D DESCRIPTION
s.objs ♦ ♦ ♦ Cell array of solid objects
s.name ♦ ♦ ♦ Cell array of names (default for the
property ns)
s.sf ♦ ♦ ♦ String with Boolean expression (default
for the property sf)
f.objs ♦ Cell array of face objects
208 | CHAPTER 1: COMMAND REFERENCE