diff --git a/src/extras/geometries/CylinderGeometry.js b/src/extras/geometries/CylinderGeometry.js
index 9fda0b4d193586ea824aa6dabf2eaddab317563c..054b73cfec68ab9a3b9ca0ed167ad6c3a73eb0ec 100644
--- a/src/extras/geometries/CylinderGeometry.js
+++ b/src/extras/geometries/CylinderGeometry.js
@@ -130,7 +130,7 @@ THREE.CylinderGeometry = function ( radiusTop, radiusBottom, height, radialSegme
 			var uv2 = uvs[ 0 ][ x + 1 ].clone();
 			var uv3 = new THREE.Vector2( uv2.x, 0 );
 
-			this.faces.push( new THREE.Face3( v1, v2, v3, [ n1, n2, n3 ] ) );
+			this.faces.push( new THREE.Face3( v1, v2, v3, [ n1, n2, n3 ], undefined, 1 ) );
 			this.faceVertexUvs[ 0 ].push( [ uv1, uv2, uv3 ] );
 
 		}
@@ -157,7 +157,7 @@ THREE.CylinderGeometry = function ( radiusTop, radiusBottom, height, radialSegme
 			var uv2 = uvs[ heightSegments ][ x ].clone();
 			var uv3 = new THREE.Vector2( uv2.x, 1 );
 
-			this.faces.push( new THREE.Face3( v1, v2, v3, [ n1, n2, n3 ] ) );
+			this.faces.push( new THREE.Face3( v1, v2, v3, [ n1, n2, n3 ], undefined, 2 ) );
 			this.faceVertexUvs[ 0 ].push( [ uv1, uv2, uv3 ] );
 
 		}
diff --git a/src/extras/geometries/PolyhedronGeometry.js b/src/extras/geometries/PolyhedronGeometry.js
index c2d6ba07aaa8dd85caa7badd09515fb51f97392f..b7dff9890b898b7f277b687a472f22945ccccaaa 100644
--- a/src/extras/geometries/PolyhedronGeometry.js
+++ b/src/extras/geometries/PolyhedronGeometry.js
@@ -38,7 +38,7 @@ THREE.PolyhedronGeometry = function ( vertices, indices, radius, detail ) {
 		var v2 = p[ indices[ i + 1 ] ];
 		var v3 = p[ indices[ i + 2 ] ];
 
-		faces[ j ] = new THREE.Face3( v1.index, v2.index, v3.index, [ v1.clone(), v2.clone(), v3.clone() ] );
+		faces[ j ] = new THREE.Face3( v1.index, v2.index, v3.index, [ v1.clone(), v2.clone(), v3.clone() ], undefined, j );
 
 	}
 
@@ -115,9 +115,9 @@ THREE.PolyhedronGeometry = function ( vertices, indices, radius, detail ) {
 
 	// Approximate a curved face with recursively sub-divided triangles.
 
-	function make( v1, v2, v3 ) {
+	function make( v1, v2, v3, materialIndex ) {
 
-		var face = new THREE.Face3( v1.index, v2.index, v3.index, [ v1.clone(), v2.clone(), v3.clone() ] );
+		var face = new THREE.Face3( v1.index, v2.index, v3.index, [ v1.clone(), v2.clone(), v3.clone() ], undefined, materialIndex );
 		that.faces.push( face );
 
 		centroid.copy( v1 ).add( v2 ).add( v3 ).divideScalar( 3 );
@@ -143,6 +143,8 @@ THREE.PolyhedronGeometry = function ( vertices, indices, radius, detail ) {
 		var c = prepare( that.vertices[ face.c ] );
 		var v = [];
 
+		var materialIndex = face.materialIndex;
+
 		// Construct all of the vertices for this subdivision.
 
 		for ( var i = 0 ; i <= cols; i ++ ) {
@@ -182,7 +184,8 @@ THREE.PolyhedronGeometry = function ( vertices, indices, radius, detail ) {
 					make(
 						v[ i ][ k + 1 ],
 						v[ i + 1 ][ k ],
-						v[ i ][ k ]
+						v[ i ][ k ],
+						materialIndex
 					);
 
 				} else {
@@ -190,7 +193,8 @@ THREE.PolyhedronGeometry = function ( vertices, indices, radius, detail ) {
 					make(
 						v[ i ][ k + 1 ],
 						v[ i + 1 ][ k + 1 ],
-						v[ i + 1 ][ k ]
+						v[ i + 1 ][ k ],
+						materialIndex
 					);
 
 				}