Corrected calculation of reflection vector

src/renderers/shaders/ShaderChunk.js

@@ -91,13 +91,18 @@ THREE.ShaderChunk = {
 
 		"		vec3 cameraToVertex = normalize( vWorldPosition - cameraPosition );",
 
+				// http://en.wikibooks.org/wiki/GLSL_Programming/Applying_Matrix_Transformations
+				// "Transforming Normal Vectors with the Inverse Transformation"
+
+		"		vec3 worldNormal = normalize( vec3( vec4( normal, 0.0 ) * viewMatrix ) );",
+
 		"		if ( useRefract ) {",
 
-		"			reflectVec = refract( cameraToVertex, normal, refractionRatio );",
+		"			reflectVec = refract( cameraToVertex, worldNormal, refractionRatio );",
 
 		"		} else { ",
 
-		"			reflectVec = reflect( cameraToVertex, normal );",
+		"			reflectVec = reflect( cameraToVertex, worldNormal );",
 
 		"		}",