flow like the river

VISUALIZACION/node_modules/three/examples/jsm/shaders/SepiaShader.js

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+/**
+ * Sepia tone shader
+ * based on glfx.js sepia shader
+ * https://github.com/evanw/glfx.js
+ */
+
+const SepiaShader = {
+
+	name: 'SepiaShader',
+
+	uniforms: {
+
+		'tDiffuse': { value: null },
+		'amount': { value: 1.0 }
+
+	},
+
+	vertexShader: /* glsl */`
+
+		varying vec2 vUv;
+
+		void main() {
+
+			vUv = uv;
+			gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
+
+		}`,
+
+	fragmentShader: /* glsl */`
+
+		uniform float amount;
+
+		uniform sampler2D tDiffuse;
+
+		varying vec2 vUv;
+
+		void main() {
+
+			vec4 color = texture2D( tDiffuse, vUv );
+			vec3 c = color.rgb;
+
+			color.r = dot( c, vec3( 1.0 - 0.607 * amount, 0.769 * amount, 0.189 * amount ) );
+			color.g = dot( c, vec3( 0.349 * amount, 1.0 - 0.314 * amount, 0.168 * amount ) );
+			color.b = dot( c, vec3( 0.272 * amount, 0.534 * amount, 1.0 - 0.869 * amount ) );
+
+			gl_FragColor = vec4( min( vec3( 1.0 ), color.rgb ), color.a );
+
+		}`
+
+};
+
+export { SepiaShader };