# apply_quat

Multiplies a point by a quaternion.

## Description

Multiplies the point (x, y, z) by the quaternion q, storing the result in
(*xout, *yout, *zout). This is quite a bit slower than apply_matrix_f(),
so only use it to translate a few points. If you have many points, it is
much more efficient to call quat_to_matrix() and then use
apply_matrix_f().

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