Added noise to coloration passes, removed film grain pass. Added ImageOverlayPass option; effect can be specified in URL variables.

js/ImageOverlayPass.js

@@ -0,0 +1,41 @@
+/**
+ * @author rezmason
+ */
+
+THREE.ImageOverlayPass = function (texture) {
+  this.texture = texture;
+  this.shader = {
+    uniforms: {
+      tDiffuse: { value: null },
+      map: { value: this.texture },
+    },
+
+    vertexShader: `
+      varying vec2 vUv;
+      void main() {
+        vUv = uv;
+        gl_Position = vec4( position, 1.0 );
+      }
+    `,
+
+    fragmentShader: `
+      uniform sampler2D tDiffuse;
+      uniform sampler2D map;
+      varying vec2 vUv;
+
+      void main() {
+        gl_FragColor = vec4(texture2D(map, vUv).rgb * (pow(texture2D(tDiffuse, vUv).r, 1.5) * 0.995 + 0.005), 1.0);
+      }
+    `
+  };
+
+  THREE.ShaderPass.call(this, this.shader);
+};
+
+THREE.ImageOverlayPass.prototype = Object.assign( Object.create( THREE.Pass.prototype ), {
+  constructor: THREE.ImageOverlayPass,
+  render: function() {
+    this.uniforms[ "map" ].value = this.texture;
+    THREE.ShaderPass.prototype.render.call(this, ...arguments);
+  }
+});