public void setDynamic() {
        for (VertexBuffer vb : buffersList.getArray()) {
            vb.setUsage(Usage.Dynamic);
        }
    }
Indicates to the GPU that this mesh will be modified occasionally (a hint).
Sets the usage mode to {@link Usage#Dynamic}
for all {@link VertexBuffer vertex buffers} on this Mesh.
jme3-core/src/main/java/com/jme3/scene/Mesh.java