Ray structure

[Helper]

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On 09/08/2003 at 22:11, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   8.100 
Platform:   Windows  ;   
Language(s) :     C++  ;

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Hi,
can anybody explain what the values of the ray structure exactly mean, especially the ray position and the ray direction vector and in what kind of coordinates they are?
Thanks a lot
Cathleen