On 24 Apr 2000 05:54:13 -0400, Warp wrote:
>pk <thi### [at] videotronca> wrote:
>: BTW, what does "L: a*x + b*y + c*z + offset = 0" mean?? i don't
>: understand the offset thing 8(
>
>a*x + b*y + c*z = 0  would be a line that passes through the origin.

Actually, it's a plane passing through the origin with a normal vector
of <a, b, c>. The offset in the equation above is the distance from the
origin multiplied by the length of the normal vector.

As others have already recommended, you (pk) should read some
introductory text on analytical geometry (many books on computer
graphics cover this), and to tie in to another recent thread, in Austria
this is covered in 5th or 6th grade "Gymnasium" (14 or 15 year old
pupils) IIRC.

	hp

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