Doo-Sabin mesh subdivision based on a generalization of bi-quadratic uniform B-splines, as opposed to the more commonly used Catmull-Clark subdivision, which is based on generalized bi-cubic uniform B-splines. We can create a Doo-Sabin mesh subdivision using Blender Geometry Nodes with just two nodes.
Creating beautiful and impressive procedural shaders or geometric nodes in Blender requires building complex node trees consisting of a large number of nodes and many connections (links) between them. After some time it becomes difficult to track where this or that link, stretched across the entire node tree “on three screens”, begins and where exactly it ends. A simple trick can help to simplify the node tree a little and reduce the number of connections – using several copies of the Group Input node.