public <T> void setClonedValue(T original, T clone) {
        index.put(original, clone);
    }
Forces an object to be added to the indexing cache such that attempts
 to clone the 'original' will always result in the 'clone' being returned.
 This can be used to stub out specific values from being cloned or to
 force global shared instances to be used even if the object is cloneable
 normally.

@param <T> the type of object to be detected and returned
@param original the instance to be detected (alias created)
@param clone the instance to be returned (alias created)
jme3-core/src/main/java/com/jme3/util/clone/Cloner.java