*splinesurface

Creates a 3D or planar surface defined by a set of lines, and optionally, prepares it for immediate use within the automesher. It can also identify a region in the shape of a Coons patch surface for the automesher to use under the mesh without surface option.

Syntax

*splinesurface entities mark plane_flag plane options

Type

HyperMesh Tcl Modify

Description

Creates a 3D or planar surface defined by a set of lines, and optionally, prepares it for immediate use within the automesher. It can also identify a region in the shape of a Coons patch surface for the automesher to use under the mesh without surface option.

Inputs

entity_type
The type of entities to use as input. Valid values are nodes, points and lines.
mark_id
The ID of the mark containing the input entities. Valid values are 1 and 2.
plane_flag
A flag indicating if the lines are planar.
1 - A plane is calculated from the lines.
2 - Lines are projected onto the plane defined by plane.
0 - Lines are not on a plane, and a 3D surface is created.
plane
The plane used to project lines if plane_flag is set to 2.
options
Specifies options for creating the surface. Bit values are used and the value is calculated as (Bit0 + 2*Bit1 + 8*Bit3 + 1024*Bit10).
Bit0
Component mode. Used to determine which component will be used to place created surfaces.
  • 0 - Current component is used.
  • 1 - Component of input lines is used. If different components are used as input, the component to which the majority of the lines belong is used.
Bit1
Line ends usage mode. Used to control creation of vertices on the constructed spline. Currently works only for planar surfaces.
  • 0 - Vertices are created automatically on constructed surface.
  • 1 - Vertices are created at input line ends.
Bit3
Surface stitching option. Used to override the default stitching algorithm.
  • 0 - Default stitching algorithm as defined by *geomstitching command.
  • 1 - Created surface is not stitched to any of model surfaces.
Bit10
Mesh stitching option. Used to control the connectivity of the mesh created on the new spline surface in simultaneous meshing modes set by *surfacemode command.
  • 0 - New mesh is not connected.
  • 1 - In *surfacemode 1, existing mesh nodes on input lines are used if new spline edges are stitched to those lines. In *surfacemode 2, existing mesh nodes on input lines are used to create the mesh on the new spline surface.

Example

To create a surface from lines 65, 66, 67 and 69, with no elements: 

*surfacemode(4)
*createmark(lines,1) 65 66 67 68
*createplane(1,1.0000,0.0000,0.0000,0.0000,0.0000,0.0000)
*splinesurface(lines,1,0,1,1)

The *surfacemode(4) directive tells HyperMesh not to generate any elements. This command is used for creating both 3D spline surfaces and trimmed planar surfaces. The plane_flag arguments controls this option. *createmark() and *createplane() are required for this command.

Errors

None.