https://github.com/WWBN/AVideo/issues/8713

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

@@ -0,0 +1,58 @@
+/**
+ * Afterimage shader
+ * I created this effect inspired by a demo on codepen:
+ * https://codepen.io/brunoimbrizi/pen/MoRJaN?page=1&
+ */
+
+THREE.AfterimageShader = {
+
+	uniforms: {
+
+		'damp': { value: 0.96 },
+		'tOld': { value: null },
+		'tNew': { value: null }
+
+	},
+
+	vertexShader: [
+
+		'varying vec2 vUv;',
+
+		'void main() {',
+
+		'	vUv = uv;',
+		'	gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );',
+
+		'}'
+
+	].join( '\n' ),
+
+	fragmentShader: [
+
+		'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);',
+
+		'}'
+
+	].join( '\n' )
+
+};