Introducing Kampos examples :: duotone simplified

duotone.js

export default function () {
   return {
       fragment: {
           uniform: {
               u_light: 'vec3',
               u_dark: 'vec3'
           },
           main: `vec3 gray = vec3(dot(lumcoeff, color));
                      color = mix(u_dark, u_light, gray);`
      uniforms: [
           // Light tone
           {
               name: 'u_light',
               type: 'f',
               data: [1.0, 1.0, 1.0]
           },
           // Dark tone
           {
               name: 'u_dark',
               type: 'f',
               data: [0.0, 0.0, 0.0]
           }
       ]
   };
};