# Vector Collectors and Vectors

## Vector Collectors

Vector collectors collect and organize vectors.

### Nastran Cards

Vectors can be used to define orientation directions for some 1D elements and forces, or to
define the SNORM card. For orientation vectors, it is not necessary to load any card image data onto the vector collector. For SNORM vectors, you must load
the SNORM card image onto the vector collector. Once this is done,
all vectors organized into that vector collector will write out as SNORM vectors to the
Nastran bulk data file.

Card | Description |
---|---|

SNORM | Defines a surface normal vector at a grid point for CQUAD4, CQUADR, CTRIA3,
and CTRIAR shell elements. Note: There is no card image
associated with the collector. In order to view the actual SNORM cards, each
vector must be individually card edited. Loading the SNORM card image onto the
collector assigns the SNORM type onto all of the vectors contained in that
collector. |

### PAM-CRASH Cards

Card | Description |
---|---|

ADAPT / | |

PICK / | |

SUBDF / | Substructure definition |

## Vectors

Vector entities allow for the definition of a vector in 3D space. Vectors can be created using the following methods: base & magnitude, two nodes, cross-product, line tangent, or surface normal.

### LS-DYNA Cards

Card | Description |
---|---|

*DEFINE_SD_ORIENTATION | Define orientation vectors for discrete springs and dampers. |

*DEFINE_VECTOR | Define a vector by defining the coordinates of two points. |