[Radiance-general] points 'n vectors

[Rob Guglielmetti]

I have an autocad block consisting of a line and an attribute.

I'm looking to write a program (using AutoLISP, since I'm using ACAD for 
my Radiance models) that snags the start and endpoints of the line, 
determines the vector, and saves the xyz of the start point, the vector, 
and the block attribute to a text file.  This text file would be used as 
a data file for rtrace, to keep this somewhat on topic.

Wondering if anyone had any code snippets or references for such an 
adventure?  Sorry for the off-topic question.  Email me privately if you 
want to.

----
RPG