public void fromAngleNormalAxis(float angle, Vector3f axis) {
public Quaternion fromAngleNormalAxis(float angle, Vector3f axis) {
    public void fromAngleNormalAxis(float angle, Vector3f axis) {        float halfAngle = 0.5f * angle;        float sin = FastMath.sin(halfAngle);        w = FastMath.cos(halfAngle);        x = sin * axis.x;        y = sin * axis.y;        z = sin * axis.z;    }