Following in Section II.b is a
alphabetic list of the LaGriT commands. Conventions that apply to all commands
1. Lines are a maximum
of 80 characters long, identifiers are a maximum of 32 characters long.
Blanks on either side of other
delimiters are ignored. Leading blanks are ignored. Commas are usually
used for parameters that belong to the same logical set such as first point,
last point, stride. Slashes are usually used to separate sets of parameters.
4. The three parameters:
first point, last point, stride can have integer values which refer to
actual sequential point numbers or they can have the character- string
name where name has been defined by a previous pset
2. Continuation lines
are signaled by an "&" as the last character of a line to be continued.
A command can be up to 1024 characters long.
3. Delimiters are comma,
slash, equal sign, or blank. (',' '/' '='' ').
The triplet: 1, 0, 0 refers to all
The triplet: 0, 0, 0 refers to the
set of points defined in the last geometry command.
5. Commands should be typed in lower
case, however names are case sensitive.
In the command description that
follows certain symbols have special meaning.
surround optional parameters
signifies alternate choices
, or /
underline specifies default
Courier font is used for variable
names such as ifirst.
bold is used for literal
keywords such as xyz.
7. Comments are identified by * in the
first column. Comments are parsed; avoid using special characters especially
`&' in comments.
8. All names ( surface, region,
pset,...) should be limited to 32 characters.
9. The right hand rule is used to
determine normals to planes and to sheet surfaces. The first two points
determin the first vector and the first and third point determine the second
vector. By curling the fingers of the right hand from the first vector
toward the second vector, the right thumb will point in the direction of
10. To separate commands on the same
line use a semicolon (;).
xyz refers to the standard
Cartesian coordinate system
11. Three coordinate systems are
rtz refers to a cylindrical
coordinate system aligned along the z-axis, where r is the radius
measured from the zaxis, t (theta) is the angle measured in the
xy-plane from the positive x-axis toward the positive y-axis and z
is the height measured from the xy-plane.
rtp refers to a spherical
coordinate system, where r is the radius measured from the origin,
(phi) is the angle in the xy-plane measured from the positive x-axis toward
the positive y-axis, t (theta) is the angle measured from the positive
z-axis to the positive y axis.