Dot-Product
www.mathworld.com
All you ever wanted to know and more -
search for Dot Product and you should get a good 1st hit.
-Michael
[edited by - thr33d on December 16, 2003 4:23:55 PM]
All you ever wanted to know and more -
search for Dot Product and you should get a good 1st hit.
-Michael
[edited by - thr33d on December 16, 2003 4:23:55 PM]
Hmm, not very many "straight" answers there though.
As I understand it, the DP returns how similar two vectors are.
0 being perpendicular
|u|*|v| being completely orthogonal
(DP is also equal to |u|*|v|*cos(angle between u and v) fyi)
it''s calculated as the sum of the product of each ... element/part? of the vector:
DP = u.x*v.x + u.y*v.y + u.z*v.z
for a 3d vector
-Michael
As I understand it, the DP returns how similar two vectors are.
0 being perpendicular
|u|*|v| being completely orthogonal
(DP is also equal to |u|*|v|*cos(angle between u and v) fyi)
it''s calculated as the sum of the product of each ... element/part? of the vector:
DP = u.x*v.x + u.y*v.y + u.z*v.z
for a 3d vector
-Michael
The easiest way to think about it is to think of a dop-product as the size of the angle between two vectors.
Have a look at Chapter 61 in Abrash''s "Game Programming Black Book". The entire text of the book is available online at http://public.planetmirror.com/pub/gpbb.
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