public RenderState getAdditionalRenderState() {
        if (additionalState == null) {
            additionalState = RenderState.ADDITIONAL.clone();
        }
        return additionalState;
    }
Acquire the additional {@link RenderState render state} to apply
for this material.

<p>The first call to this method will create an additional render
state which can be modified by the user to apply any render
states in addition to the ones used by the renderer. Only render
states which are modified in the additional render state will be applied.

@return The additional render state.
jme3-core/src/main/java/com/jme3/material/Material.java