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ray problem

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i need to rotate a rays vector so that it points to a certain point. i already know how to rotate a vector by a certain amount of degrees. i thought about calculating a vector from the rays origin and the certain point using vector subtraction and then using the dotproduct to get the angle between this vector and the rays vector. then i rotate the rays vector by this angle. but i saw that this only works in 2D. in 3D i have to rotate the vector by two angles around the X and the Y axis. can somebody help me ?

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Actually it''s very simple:

you have
- a ray=(origin,direction)
- a point P

just fill in normalized(P-origin) for direction

There''s no need for a rotation

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