What is the “blueprint” editor? It’s a simple editor that allows to create triangles meshes in 2D and extrude them (in the future) to a full 3D mesh or feed it to some procedural functions to create a more complex mesh.
This way it’s fairly easy to create a simple 3D model for complex usages. For example, you could extrude a 2D model over a spline and create some organic-shaped forms. At least, that’s what the idea is. So far the 2D stuff works, the splines also work, but it still needs some work before I will post screen shot.