public void clearMatParamOverrides() {
        if (!localOverrides.isEmpty()) {
            setMatParamOverrideRefresh();
        }
        localOverrides.clear();
    }
Remove all local material parameter overrides.

@see #addMatParamOverride(com.jme3.material.MatParamOverride)
jme3-core/src/main/java/com/jme3/scene/Spatial.java