GEOMETRY SURFACE 3SIDES [snam] [+mid1] lnam1 [+mid2] lnam2 [+mid3] lnam3 [elt]

            

This command is used to create a 3-sided surface from 3 lines. An extended form of the command allows the automatic creation of combined lines.

snam = name of the surface, used for later references to the surface.

+mid = names of lines defining new combined lines.

lnam = names of lines, or line combinations.

elt = element type on the surface. A default element type of TR3 will be assumed if `elt' is omitted. Refer to command MESHING TYPES for a detailed description.

In the case where no new combined lines are defined in the command, FEMGEN will create a surface based on the three lines specified. These lines may be a simple line or a combined line.

Where new combined lines are defined in the command, either cursor picking or keyboard input can be used to distinguish between `last lines' and `mid-side lines'. With the cursor, the left button is used to specify a last line and the middle button (or right button on a two button mouse) is used to specify a mid-side line. With the keyboard, a last line is typed normally while a mid-side line is immediately preceded by a `+' (plus sign).

Each side is identified by its last line which enables simple termination of the command. Thus the definition of a surface is completed by specifying the last line of the last side.

Return Level: GEOMETRY SURFACE

Examples:

1.

GEOMETRY SURFACE 3SIDES S1 L1 L2 L3

Create a three-sided surface S1 with edges L1, L2, and L3 with the default element type TR3.

2.

GEOMETRY SURFACE 3SIDES S1 L1 L2 L3 TR6

Create a three-sided surface S1 with edges L1, L2, and L3 with element type TR6.

3.

GEOMETRY SURFACE 3SIDES S1 +L1 +L2 L3 L4 +L5 L6

Create a surface S1 with 3 sides, the first of which is a combined line comprising the lines L1, L2 and L3; the second side is the line L4 and the third side a combined line comprising the lines L5 and L6.

See also the following commands

'LABEL GEOMETRY SURFACES'
'UTILITY DELETE SURFACES'
'UTILITY TABULATE GEOMETRY SURFACES'
'VIEW GEOMETRY'