Toonkit For Cycles is Cogumelo Softworks' in-house solution for rendering NPR, PSR, and stylish images with Cycles. It implements new OSL shader nodes that integrate into the Cycles node system and Blender's viewport, and the shaders stay fully interactive as you work. Most converge to noiseless production-quality images in roughly 4 to 32 samples.
In Toonkit, every node output is a color — including shadings, shadows, and specular — so you can mix and operate them without the usual mix restrictions. A Face Paint system uses vertex colors in Edit Mode to speed up painting for cartoon styles. Two raytrace-based line rendering nodes handle outlines, with controls over the influence of Normal, Depth, Object Id, Silhouette, and Vertex Color.
The add-on suits anime, technical, arch viz, engineering, and expressive art work. Version 1.7 added support for Blender 4.x, reworked the Face Paint tools around Blender Color Attributes, and made the downloaded file act as its own installer, alongside a code redesign. Earlier versions extended support to Blender 3.x and 2.93.