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HTML/ThreeJS/node_modules/three/examples/js/shaders/AfterimageShader.js

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+( function () {
+
+	/**
+ * Afterimage shader
+ * I created this effect inspired by a demo on codepen:
+ * https://codepen.io/brunoimbrizi/pen/MoRJaN?page=1&
+ */
+	const AfterimageShader = {
+		uniforms: {
+			'damp': {
+				value: 0.96
+			},
+			'tOld': {
+				value: null
+			},
+			'tNew': {
+				value: null
+			}
+		},
+		vertexShader:
+  /* glsl */
+  `
+
+		varying vec2 vUv;
+
+		void main() {
+
+			vUv = uv;
+			gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
+
+		}`,
+		fragmentShader:
+  /* glsl */
+  `
+
+		uniform float damp;
+
+		uniform sampler2D tOld;
+		uniform sampler2D tNew;
+
+		varying vec2 vUv;
+
+		vec4 when_gt( vec4 x, float y ) {
+
+			return max( sign( x - y ), 0.0 );
+
+		}
+
+		void main() {
+
+			vec4 texelOld = texture2D( tOld, vUv );
+			vec4 texelNew = texture2D( tNew, vUv );
+
+			texelOld *= damp * when_gt( texelOld, 0.1 );
+
+			gl_FragColor = max(texelNew, texelOld);
+
+		}`
+	};
+
+	THREE.AfterimageShader = AfterimageShader;
+
+} )();