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web-app/node_modules/three/examples/jsm/shaders/LuminosityShader.js

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+/**
+ * Luminosity
+ * http://en.wikipedia.org/wiki/Luminosity
+ */
+
+const LuminosityShader = {
+
+	name: 'LuminosityShader',
+
+	uniforms: {
+
+		'tDiffuse': { value: null }
+
+	},
+
+	vertexShader: /* glsl */`
+
+		varying vec2 vUv;
+
+		void main() {
+
+			vUv = uv;
+
+			gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
+
+		}`,
+
+	fragmentShader: /* glsl */`
+
+		#include <common>
+
+		uniform sampler2D tDiffuse;
+
+		varying vec2 vUv;
+
+		void main() {
+
+			vec4 texel = texture2D( tDiffuse, vUv );
+
+			float l = luminance( texel.rgb );
+
+			gl_FragColor = vec4( l, l, l, texel.w );
+
+		}`
+
+};
+
+export { LuminosityShader };