ProBuilder joins Unity! You can now create level design directly in the Unity Editor faster and easier.
What is Probuilder?
ProBuilder is a unique hybrid of 3D modeling and level design tools, optimized for building simple geometry but capable of detailed editing and UV unwrapping as needed.
ProBuilder lets you quickly prototype structures, complex terrain features, vehicles and weapons, or to make custom collision geometry, trigger zones, or nav meshes.
You can extrude and inset your meshes. Create procedural shapes like stairs. Change UV. Create editable shapes. All in Unity editor!
On top of Probuilder, Unity has added Polybrush and Progrids.
Polybrush lets you to blend textures and colors, sculpt meshes directly in the Unity editor. Note that Polybrush is still in beta. ( February 2018)
Next, we have ProGrids! It gives you both a visual and functional grid, which snaps on all 3 axis. This helps developers to make level construction incredibly fast, easy, and precise. It is especially useful for modular or tile-based environments.
Combine ProBuilder, Polybrush and ProGrid together, you get a complete in-editor level design solution for faster and more precise geometry construction.