public Vector3f getClosestPoint(Vector3f point) {
        return getClosestPoint(point, new Vector3f());
    }
Find the point in this plane that's nearest to the specified point.

@param point location vector of the input point (not null, unaffected)
@return a new location vector in this plane
jme3-core/src/main/java/com/jme3/math/Plane.java