GEOMETRY LINE CIRCLE pnam radius [plane]
or: ... pnam1 pnam2 pnam3

      

This command is used to create circles. In one form four 90 degree arcs of given radius with a centre at the specified point are created; the second form creates a circle formed of arcs connected to the three points.

pnam = name of a point which defines the centre of the circle.

radius = radius of circle.

plane = plane in which the circle is to be created

pnam1 = name of first point through which the circle passes.

pnam2 = name of second point through which the circle passes.

pnam3 = name of third point through which the circle passes.

Where 'plane' can be any of the following:

plane description

none The circle will be in a plane parallel to the global XY plane

SCREEN The circle will be in a plane parallel to the screen

XY ['csname'] The circle will be in a plane parallel to the plane

YZ ['csname'] specified; if a coordinate system name is given the plane will

ZX ['csname'] be in that local system, otherwise the plane will be global

'shape' The name of an existing FEMGEN plane shape

'normal_dir' 'split_dir' The definition of the normal to the circle and the location of a point defining the arcs

By default each arc that is created will have four divisions (ie five nodes). The default number of divisions can be reset using the command MESHING DIVISION DEFAULT.

Return Level: GEOMETRY LINE

Examples:

1.

GEOMETRY LINE CIRCLE P51 1.23

Creates four 90 degree arcs in a plane parallel to the global XY plane centred on p51 with a radius of 1.23

2.

GEOMETRY LINE CIRCLE P51 1.23 ZX LOCAL1

Creates four 90 degree arcs centred on P51 with a radius of 1.23 in a plane parallel to the ZX plane of the local coordinate system 'LOCAL1'.

3.

GEOMETRY LINE CIRCLE PCENTRE .5534 0 1 0 .707 0 .707

Creates four 90 degree arcs centred on PCENTRE with a radius of .5534 in a plane normal to the (0 1 0) direction, ie y-direction, with the end points of the arcs being created at 90 degrees from the starting position defined by the vector (.707 0 .707) ie at 45 degrees to the X axis.

4.

GEOMETRY LINE CIRCLE P23 P36 P110

Creates a series of arcs from a circle passing through the specified points. The points given are used in the arc definitions an additional point may also be generated as any arc over 170 degrees will be split into two.

See also the following commands

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