Creating Curves in Flowlines
If your image contains cylindrical or curved objects, you can use several techniques to curve the Flowline Mesh to match the shape of the object.
You can make some vertexes sharp or curved, and you can adjust the flowline tension.
In the following example, this simple square Flowline Mesh as folded over itself. The loose or tight setting determines the amount of curve in the fold:
When a flowline is tight, it is more angular. When it is loose, it curves more.