How to: (3d) line with line intersection?

1. Looking for a quick 3D line to line intersection routine.

A simple request...
I'm trying to implement a processes of drawing wide lines in 3D
and am in search of a fast 3D line intersection routine.  Any pointers
or C implementations are appreciated.

Thanks
Philip

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+----------------------+-------------------------------------------+
| Philip R. Thompson   | Computer Resource Laboratory , Rm 9-532   |
|                      | School of Architecture and Urban Planning |

| (617) 253-3535       | 105 Massachusetts Avenue                  |
|                      | Cambridge, MA  02139                      |
+======================+===========================================+

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