Examples: Remove pixel ratio from sobel

examples/webgl_postprocessing_edgedetection.html

@@ -60,8 +60,6 @@
 				enable: true
 			};
 
-			var pixelRatio = window.devicePixelRatio;
-
 			init();
 			animate();
 
@@ -95,7 +93,7 @@
 				//
 
 				renderer = new THREE.WebGLRenderer();
-				renderer.setPixelRatio( pixelRatio );
+				renderer.setPixelRatio( window.devicePixelRatio );
 				renderer.setSize( window.innerWidth, window.innerHeight );
 				document.body.appendChild( renderer.domElement );
 
@@ -117,8 +115,8 @@
 
 				effectSobel = new THREE.ShaderPass( THREE.SobelOperatorShader );
 				effectSobel.renderToScreen = true;
-				effectSobel.uniforms.resolution.value.x = window.innerWidth * pixelRatio;
-				effectSobel.uniforms.resolution.value.y = window.innerHeight * pixelRatio;
+				effectSobel.uniforms.resolution.value.x = window.innerWidth;
+				effectSobel.uniforms.resolution.value.y = window.innerHeight;
 				composer.addPass( effectSobel );
 
 				var controls = new THREE.OrbitControls( camera );
@@ -144,8 +142,8 @@
 				renderer.setSize( window.innerWidth, window.innerHeight );
 				composer.setSize( window.innerWidth, window.innerHeight );
 
-				effectSobel.uniforms.resolution.value.x = window.innerWidth * pixelRatio;
-				effectSobel.uniforms.resolution.value.y = window.innerHeight * pixelRatio;
+				effectSobel.uniforms.resolution.value.x = window.innerWidth;
+				effectSobel.uniforms.resolution.value.y = window.innerHeight;
 
 			}