Is it possible to create Procedural Foliage Blocking Volume as a spline?
No.
But it is possible to prevent the foliage to spawn on a specific landscape layer when using the procedural foliage tool that utilizes the blocking volumes.
So generally you make your spline as an object, add a blueptility function to paint the landacape with it, and then set the procedural generator not to generate stuff on that specific layer, and you end up with roads and such.
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