# PLINE

Geometric Properties ElementPLINE lets you specify the properties for an associated line spring element

## Format

<PLINE
id       = "integer"
k        = "real"
c        = "real"
dir      = "integer"
L1       = "real"
L2       = "real"
L3       = "real"
L4       = "real"
L5       = "real"
L6       = "real"
graph    = "integer"
/>

## Attributes

id
Unique beam property identification number.
k
Spring stiffness.
c
Damping coefficient, default = 0.
dir

This attribute specifies the direction of resistance for the spring element.

dir = -1 implies a compression only spring. That is, there is no resistance to tension.

dir = 1 implies a tension-only resisting spring. That is, there is no resistance to compression.

dir = 0 implies the spring can resist both tension and compression.

The default is dir = 0.

L1 - L6
Relaxed distance between nodes 1 and 2.
graph
A post-processing flag that determines how this element is represented in the animation H3D. Default is 0.

## Example

The example demonstrates the definition of a PLINE property element.

<PLINE id="2" k="5.0" c="0.01" dir="-1" />

4. L1, L2L6 is the relaxed distance between the element nodes; the default value is calculated from $|{r}_{i}-{r}_{j}|$ where ${r}_{i}$ is the nodal position of node i and ${r}_{j}$ is the nodal position of node j.