Fix issue #3584: CylinderGeometry was using uv.u instead of uv.x

src/extras/geometries/CylinderGeometry.js

@@ -113,7 +113,7 @@ THREE.CylinderGeometry = function ( radiusTop, radiusBottom, height, radialSegme
 
 			var uv1 = uvs[ 0 ][ x ].clone();
 			var uv2 = uvs[ 0 ][ x + 1 ].clone();
-			var uv3 = new THREE.Vector2( uv2.u, 0 );
+			var uv3 = new THREE.Vector2( uv2.x, 0 );
 
 			this.faces.push( new THREE.Face3( v1, v2, v3, [ n1, n2, n3 ] ) );
 			this.faceVertexUvs[ 0 ].push( [ uv1, uv2, uv3 ] );
@@ -140,7 +140,7 @@ THREE.CylinderGeometry = function ( radiusTop, radiusBottom, height, radialSegme
 
 			var uv1 = uvs[ y ][ x + 1 ].clone();
 			var uv2 = uvs[ y ][ x ].clone();
-			var uv3 = new THREE.Vector2( uv2.u, 1 );
+			var uv3 = new THREE.Vector2( uv2.x, 1 );
 
 			this.faces.push( new THREE.Face3( v1, v2, v3, [ n1, n2, n3 ] ) );
 			this.faceVertexUvs[ 0 ].push( [ uv1, uv2, uv3 ] );