@Override
    public void getRandomPoint(Vector3f store) {
        super.getRandomPoint(store);
        // now move the point from the mesh's face toward the center of the mesh
        // the center is in (0, 0, 0) in the local coordinates
        store.multLocal(FastMath.nextRandomFloat());
    }
Randomly selects a point inside the convex hull
of a randomly selected mesh.

@param store
       storage for the coordinates of the selected point
jme3-core/src/main/java/com/jme3/effect/shapes/EmitterMeshConvexHullShape.java