@Override
    public void write(JmeExporter ex) throws IOException {
        OutputCapsule oc = ex.getCapsule(this);
        oc.write(start, "start", 0);
        oc.write(end, "end", 0);
        oc.write(dirty, "dirty", false);
    }
Returns true if this region includes the entire buffer. Can be used for
optimization.

@return
jme3-core/src/main/java/com/jme3/shader/bufferobject/BufferRegion.java