public SafeArrayList<MatParamOverride> getWorldMatParamOverrides() {
        return worldOverrides;
    }
Get the world material parameter overrides.

Note that this list is only updated on a call to
{@link #updateGeometricState()}. After update, the world overrides list
will contain the {@link #getParent() parent's} world overrides combined
with this spatial's {@link #getLocalMatParamOverrides() local overrides}.

@return The list of world material parameter overrides.
jme3-core/src/main/java/com/jme3/scene/Spatial.java