*geomvectorcreate
From input nodes and geometries, create vectors tangent to lines or normal to surfaces.
Syntax
*geomvectorcreate geom_type geom_mark_id node_mark_id node_tol magnitude parlen reverse
Type
HyperMesh Tcl Modify Command
Description
This command creates vectors on input set of nodes in such a way that vector direction coincides with line tangent or surface normal at closest to the node point on geometry.
Inputs
- geom_type
- The input geometry type. Valid values are:
- lines - If specified, then tangent at selected line is used for created vector direction.
- surfs - If specified, then normal at selected surface is used for created vector direction.
- geom_mark_id
- The mark of input lines or surfaces.
- node_mark_id
- The mark of input nodes. The nodes are used as a base for created vector and to find closest point on geometry to calculate vector direction.
- node_tol
- If positive, then use as proximity tolerance for geometry points. This means that vector is not created unless closest point of selected geometry is found within the distance specified by node_tol.
- magnitude
- Parameter that specifies the length of resulted vector (except for the case when parameter parlen is not zero).
- parlen
- Parameter that specifies the method to calculate resulted vector length. Valid values are:
- 0 - The value specified by magnitude parameter is used.
- 1 - Parametric value is used. For curve tangent this is the value of parametric curve derivative. For surface normal the value is defined by the length of cross product of surface parametric derivatives. Parameterization of curves and surfaces is normalized from 0 to 1.
- reverse
- Parameter that specifies direction of resulted vector. Valid values are:
- 0 - Direction coincides with parametric direction of curve or surface normal.
- 1 - Direction is opposite to parametric direction of curve of surface normal.
Example
*createmark nodes 1 1
*createmark lines 1 4
*geomvectorcreate lines 1 1 -1.0 1.0 0 0
Errors
if { [ catch {command_name...} ] } {
# Handle error
}
Version History
10.0