I updated Oskar’s implementation of Tonal Art Maps, based on this paper. I ported it to URP and rewrote the rendering and tone value checks to use shaders.
The biggest thing missing comared to the source paper is they used 6 tone blending. I did not have time to implement that part of Emil Praun, et al.’s research. I compensated by generating a large number of tone values, though that still does not have quite the desired pencil blending effect.
The project includes both a generator that generates the tonal art map as well as a shader that can render it. The generator can be accessed as an editor window in unity. (Generators>Tonal Art Map Generator)
The generated art maps are not included.