Rotate a vector relative to itself

Question

I have a plane defined by transform.forward and transform.right, with 0 degrees corresponding to the forward vector and positive 90 degrees to the right vector.

How can I create a third vector rotated in this plane. A rotation of 0 degrees would mean the vector is identical to transform.forward, a rotation of 30 degrees would mean it forms a 30 degree angle with the forward vector.

In other words, I want to rotate the forward vector relative to itself, in the plane it defines with the right vector.

Answer 1

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Answer by whydoidoit · Jun 20, 2012 at 09:22 PM

You need to rotate it around the cross product vector - in this case it will be transform.up - which means this documentation has an almost exact example :)

    var newVector = Quaternion.AngleAxis(30, transform.up) * transform.forward;

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Rotate a vector relative to itself

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