The Illustration Shader is a node-based tool designed to convert 3D models into painted illustrations. Operating through a single material setup, it utilizes both the Shader Editor and Geometry Nodes to generate painterly effects. The tool includes dedicated node groups for color filtering, brush alphas, and stroke distribution, allowing users to choose between random or line art styles. It features support for broken edges, stroke blending, light and color normalization, and full UV and texture compatibility. The setup works natively in both Cycles and EEVEE.