diff --git a/examples/jsm/postprocessing/RenderPass.js b/examples/jsm/postprocessing/RenderPass.js
index 333b2fe7e549b3..a6c3804ec67b90 100644
--- a/examples/jsm/postprocessing/RenderPass.js
+++ b/examples/jsm/postprocessing/RenderPass.js
@@ -5,7 +5,7 @@ import { Pass } from './Pass.js';
 
 class RenderPass extends Pass {
 
-	constructor( scene, camera, overrideMaterial, clearColor, clearAlpha ) {
+	constructor( scene, camera, overrideMaterial = null, clearColor = null, clearAlpha = null ) {
 
 		super();
 
@@ -15,7 +15,7 @@ class RenderPass extends Pass {
 		this.overrideMaterial = overrideMaterial;
 
 		this.clearColor = clearColor;
-		this.clearAlpha = ( clearAlpha !== undefined ) ? clearAlpha : 0;
+		this.clearAlpha = clearAlpha;
 
 		this.clear = true;
 		this.clearDepth = false;
@@ -31,7 +31,7 @@ class RenderPass extends Pass {
 
 		let oldClearAlpha, oldOverrideMaterial;
 
-		if ( this.overrideMaterial !== undefined ) {
+		if ( this.overrideMaterial !== null ) {
 
 			oldOverrideMaterial = this.scene.overrideMaterial;
 
@@ -39,16 +39,21 @@ class RenderPass extends Pass {
 
 		}
 
-		if ( this.clearColor ) {
+		if ( this.clearColor !== null ) {
 
 			renderer.getClearColor( this._oldClearColor );
-			oldClearAlpha = renderer.getClearAlpha();
+			renderer.setClearColor( this.clearColor );
+
+		}
 
-			renderer.setClearColor( this.clearColor, this.clearAlpha );
+		if ( this.clearAlpha !== null ) {
+
+			oldClearAlpha = renderer.getClearAlpha();
+			renderer.setClearAlpha( this.clearAlpha );
 
 		}
 
-		if ( this.clearDepth ) {
+		if ( this.clearDepth == true ) {
 
 			renderer.clearDepth();
 
@@ -56,17 +61,30 @@ class RenderPass extends Pass {
 
 		renderer.setRenderTarget( this.renderToScreen ? null : readBuffer );
 
-		// TODO: Avoid using autoClear properties, see https://github.com/mrdoob/three.js/pull/15571#issuecomment-465669600
-		if ( this.clear ) renderer.clear( renderer.autoClearColor, renderer.autoClearDepth, renderer.autoClearStencil );
+		if ( this.clear === true ) {
+
+			// TODO: Avoid using autoClear properties, see https://github.com/mrdoob/three.js/pull/15571#issuecomment-465669600
+			renderer.clear( renderer.autoClearColor, renderer.autoClearDepth, renderer.autoClearStencil );
+
+		}
+
 		renderer.render( this.scene, this.camera );
 
-		if ( this.clearColor ) {
+		// restore
+
+		if ( this.clearColor !== null ) {
+
+			renderer.setClearColor( this._oldClearColor );
+
+		}
+
+		if ( this.clearAlpha !== null ) {
 
-			renderer.setClearColor( this._oldClearColor, oldClearAlpha );
+			renderer.setClearAlpha( oldClearAlpha );
 
 		}
 
-		if ( this.overrideMaterial !== undefined ) {
+		if ( this.overrideMaterial !== null ) {
 
 			this.scene.overrideMaterial = oldOverrideMaterial;