Hello!
The title sums it! A simple and fast 2 color toon shader with a bit of silhouette. Inspired by the old school GLSL basic toon shader.
shader Toon(
float Specular = 0.5,
float Thickness = 0.2,
output closure color CL = holdout()
){
float Intensity = sqrt(dot(abs(P+I),abs(N)))*Specular;
float Line = dot(I,N);
color Clr = color(0);
(Intensity > 0.95/Specular) ? Clr = color(1.0,0.0,0.0) : Clr = color(0.5,0,0.0);
Line > 0.002 && Line < Thickness ? Clr = color(1) : Clr = Clr;
CL = diffuse(N)*Clr*Intensity;
return;
}