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I know there are a bunch of good compound for doing extrusion of the curves already (I'm using a Power Extrude add-on, check it out), but here I have a few ones that solves some specific type of problems - first one is simply extrudes one side mesh that always faces to camera and second one is defines where is left and right. Also no repeat or while nodes is using, just ice logic, nothing fancy. Hope you find them useful, if not that's ok too