Vector Length
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The length of a vector 
![mag = \sqrt[]{x^{2} + y^{2} + z^{2}}](http://s0.wp.com/latex.php?latex=mag+%3D+%5Csqrt%5B%5D%7Bx%5E%7B2%7D+%2B+y%5E%7B2%7D+%2B+z%5E%7B2%7D%7D&bg=ffffff&fg=000000&s=0 "mag = \sqrt[]{x^{2} + y^{2} + z^{2}}")
In CG, we normally need a vector which is unit length, aka a normalized vector. To obtain a normalized vector just divide its components by the vector’s magnitude.
i.e., the components of vector 
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