@Override
                public Thread newThread(final Runnable task) {
                    final Thread thread = new Thread(task);
                    thread.setName("jME3 Terrain Thread [" + counter.incrementAndGet() + "]");
                    thread.setDaemon(true);
                    return thread;
                }
The constructor of the terrain executor service.
jme3-terrain/src/main/java/com/jme3/terrain/executor/TerrainExecutorService.java