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In Katana 2.0 and 2.1, Light Filters can be created with the PrmanLightFilterCreate macro. You can either create a light filter that is shared between lights or a light filter that is the child of a light. Some light filters are more suited to one mode or another. For example, a Rod can easily be shared between lights, but it generally makes sense for a Barn or a Cookie to be attached to one specific light.