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Yes, provided that you want the normalized vector difference pointing from P2 to P1. 
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Yes, provided that you want the normalized vector difference pointing from P2 to P1.

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can you pleae explain more the formula? just a simple explanation. <br />
i didn't understand why they are substracting the vectors then dividing by the norm. is it just like u said to normilize?
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can you pleae explain more the formula? just a simple explanation.
i didn't understand why they are substracting the vectors then dividing by the norm. is it just like u said to normilize?

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A small typo - Missed trailing || <br />
<br />
P1-P2/||P1-P2|| vector is the solid line, i.e., a vector pointing in the same direction, but only 1 unit long.<br />
+ &lt;- - - - -&lt;-----+<br />
P1 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;P2
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A small typo - Missed trailing ||

P1-P2/||P1-P2|| vector is the solid line, i.e., a vector pointing in the same direction, but only 1 unit long.
+ <- - - - -<-----+
P1                    P2

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I have a problem with the following formula i don't know if it's correct:<br />
i have the following vectors: P1 = (x1,y1), P2 = (x2,y2).<br />
the formula is the &nbsp;following:<br />
P1 - P2 / || P1 - P2 || where ||.|| is the norm.<br />
i did the following. <br />
(x1-x2)/ sqrt[(x1-x2)^2 + (y1-y2)^2]<br />
&nbsp;(y1-y2)/ sqrt[(x1-x2)^2 + (y1-y2)^2]<br />
<br />
is that the right way to do it???
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I have a problem with the following formula i don't know if it's correct:
i have the following vectors: P1 = (x1,y1), P2 = (x2,y2).
the formula is the  following:
P1 - P2 / || P1 - P2 || where ||.|| is the norm.
i did the following. 
(x1-x2)/ sqrt[(x1-x2)^2 + (y1-y2)^2]
 (y1-y2)/ sqrt[(x1-x2)^2 + (y1-y2)^2]

is that the right way to do it???

Geometric direction vectors

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Game Programming

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