Surface Rig is an add-on that enables the quick placement of armature bones directly onto the surfaces of objects. It provides shortcuts for placing bones, starting new bone chains, removing points, and confirming or canceling the operation. While standard Blender snapping modes can achieve similar results for 3D meshes, this tool is designed to speed up the initial sketching phase of an armature.

The tool is particularly useful for rigging Grease Pencil objects, as Blender lacks built-in tools for snapping bones to the Grease Pencil canvas. It was originally developed to streamline the rigging process for tessellated texture planes.