Math Is Fun Forum

safra

Member

Registered: 2005-12-03

Posts: 41

Change the direction of a vector by another vector

Hi,

I have a Vector A (xyz) and another vector B (xyz). Let's say A becomes a "child" of B and inherits the B direction as the origin. How can I get the new direction of A based on its old direction and the direction B is pointing at?

Sorry for the poor explanation, I don't know the right wording for this which also makes it hard to search for the solution. I have read about matrices etc. but no luck so far.

Thanks!

safra

Member

Registered: 2005-12-03

Posts: 41

Re: Change the direction of a vector by another vector

I guess I meant how to rotate an existing vector according another vector?

I have been reading about quaternions, cross products, eulerAngles etc, still confused on how to do this?

Anyone who knows how to do this?

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Change the direction of a vector by another vector

Hi safra;

Any of this useful to you? It is horribly formatted but...

http://steve.hollasch.net/cgindex/math/rotvec.html

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