private void cleanProbes() {
        if (probes.size() != probeMapping.size()) {
            for (LightProbe probe : probeMapping.keySet()) {
                if (!probes.contains(probe)) {
                    garbage.add(probe);
                }
            }
            for (LightProbe probe : garbage) {
                probeMapping.remove(probe);
            }
            garbage.clear();
            probes.clear();
        }
    }
Set the scenes for which to render light gizmos.

@param scene the root of the desired scene (alias created)
jme3-core/src/main/java/com/jme3/environment/util/LightsDebugState.java