Brush in the air.
In this video I show you how to create a "brush in the air" effect. All you have to do is create a landscape object (or object with a lot of polygons), add "spline wrap" deformer as a child and then create a spline. This spline is gonna be our shape created with the brush effect.
The inspiration to create this tutorial comes from the awesome work of "Velvet spectrum": behance.net/velvetspectrum