public boolean isInstanceRendering() {
        return instanceRendering;
    }
Get if this filter is using instance rendering.
@return <code>true</code> if this filter is using instance rendering and <code>false</code> otherwise.
@see #setInstanceRendering(boolean)
jme3-vr/src/main/java/com/jme3/shadow/InstancedDirectionalShadowFilter.java