This blender add-on provides a brush tool for flow map painting.  It supports 2D Image Editor – Paint Mode and also the 3D Viewport – Texture Paint Mode and 3D Viewport – Vertex Paint Mode.  Installation  Option 1: Install the flow_map_painter.zip directly in blender.  Option 2: Extract the flow_map_painter.zip and put the folder in your scripts directory.  Option 3: Clone the github repository into your scripts directory.