GEOMETRY LINE SPLINE [lnam] pnam1 pnam2 senm [divn]

          

This command is used to define a spline curve line from a set of points.

lnam = name of the line, used for later references to the line, for example when a surface is defined.

pnam1 = name of the start point of the line in the set.

pnam2 = name of the end point of the line in the set.

senm = name of a set containing the start and end points, plus mid points and any other points that are to be used in the evaluation of the spline.

divn = integer which specifies how many nodes are to be placed along the line. If omitted the default as set with MESHING DIVISION DEFAULT is used.

The points are used in the order that they appear in the set. The start and end points must belong to the set, but need not be the first and last points in the set. The order in which points are stored in the set may be found using the command UTILITY TABULATE GEOMETRY POINTS senm. All the points in the set are used in the calculation of the spline parameters. It is recommended that a separate set containing points is created for each spline that is to be defined (unless two adjacent splines are required to have continuity of slope). The maximum number of points allowed in a set which is used in the definition of a spline is 99. Exceeding this limit will cause the message E0014 : Too many points in spline *** to be issued (even though the spline itself may not directly refer to the maximum number of points). The line referred to in the message will then be seen as a straight line from the start point to the end point.

 

Figure 2.80: Definition of a spline line

Return Level: GEOMETRY LINE

Examples:

1.

GEOMETRY LINE SPLINE LS1 P1 P6 SE1

Creates a spline line LS1 starting at point P1, ending at point P6, where start, mid and end points are defined in set SE1.

See also the following commands

'LABEL GEOMETRY LINES'
'UTILITY DELETE LINES'
'UTILITY TABULATE GEOMETRY LINES'
'VIEW GEOMETRY'