`blended_yaw_axis`

Vector3 blended_yaw_axis(const Quaternion &rotation, const Vector3 &up_reference, Scalar levelling_weight) noexcept

Parameters

Name	Type	Description
`rotation`	`const Quaternion &`
`up_reference`	`const Vector3 &`	The local vertical; unit length.
`levelling_weight`	`Scalar`

Vector3

A unit axis; up_reference itself at weight one, bit for bit.

Returns the axis mouse X turns about for a given levelling weight.