public Vector3f mult(Vector3f vec) {
        return mult(vec, null);
    }
Applies the linear transformation to the vector argument and returns the
result as a new vector. The matrix is unaffected.

<p>This can also be described as multiplying the matrix by a column
vector.

@param vec the coordinates to transform (not null, unaffected)
@return a new Vector3f
jme3-core/src/main/java/com/jme3/math/Matrix3f.java