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Thus node is only available in a node editor context where raytracing is available. It will check the current (incoming) ray for specific properties and return true if they match.
This control is only available if the Boolean input is connected. If turned on, it will simply pass through the Boolean input to the output, completely bypassing the node.
These two columns are ray properties to check for. The first column depends on the type of ray, the second column covers additional properties.
This is the plugin of the month for November 2018, made possible by the finest patrons on Patreon.