setting angle between two vector

[levan]

So I have some angle Alfa defined between two vectors AB and BC. I want to change this angle to some value but point A and B should not move only C is allowed to dislocate, kind of point B should rotate not around but along AB and BC axis and C should follow rotational pattern. Only thing I am thinking about how to implement it correctly is to create plane in Ogre out of these three points A, B, and C, then calculate norm vector to this plane and let point B rotate around this normal vector (with simple rotate method) with the value of the angle that we want to obtain and let C follow the rotational pattern of the point B, then both vectors will form desired angle. However if anybody has better ideas or may be in Ogre there is some functions that are doing it easily I will highly appreciate.


Many thanks

levan

[Transporter]

http://www.ogre3d.org/forums/viewtopic.php?f=1&t=81951

Calculate angle: dot product -> Ogre::Vector3::angleBetween
Rotate: rotation matrix -> Ogre::Matrix3 or Ogre::Quaternion