RetopoFlow is a suite of intuitive, sketch-based retopology tools for Blender developed by Orange Turbine. It allows you to draw directly onto the surface of high-poly models, automatically generating geometry that conforms to their shape.
The toolset has recently been updated with the release of RetopoFlow 4, a complete rewrite that introduces powerful new features. While still in beta, RetopoFlow 4 is available at a discounted price.
In RetopoFlow 4, the PolyPen tool offers precise control for building complex topology one vertex at a time, while the PolyStrips tool makes it easy to map out and refine key face loops on complex models. The Strokes tool is highly versatile, ideal for quickly sketching out quad patches or filling gaps in topology, and the Contours tool gives you a quick and easy way to retopologize cylindrical forms.
For interactive adjustments, the Tweak Brush lets you reposition vertices directly on the source mesh, and the Relax Brush helps smooth out vertex positions while keeping them constrained to the mesh surface.
