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QuaternionRotate Method

Rotates a 3d vector. This operation is also called conjugation, because the result is the same as (q.Conjugate()*(0,x,y,x)*q/q.LengthSquared).Vector.

Namespace:  Rhino.Geometry
Assembly:  RhinoCommon (in RhinoCommon.dll)
Since: 5.0
Syntax
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public Vector3d Rotate(
	Vector3d v
)

Parameters

v
Type: Rhino.GeometryVector3d
The vector to be rotated.

Return Value

Type: Vector3d
R*v, where R is the rotation defined by the unit quaternion. This is mathematically the same as the values (Inverse(q)*(0,x,y,z)*q).Vector and (q.Conjugate()*(0,x,y,x)*q/q.LengthSquared).Vector.
Remarks
If you need to rotate more than a dozen or so vectors, it will be more efficient to calculate the rotation matrix once and use it repeatedly.
See Also