allows ExtrudeGeometry to take in frames options for custom TNB (tangent, normal, binormals). #1810

src/extras/geometries/ExtrudeGeometry.js

@@ -16,7 +16,8 @@
  *  bevelSize:		<float>, 		// how far from text outline is bevel
  *  bevelSegments:	<int>, 			// number of bevel layers
  *
- *  extrudePath:	<THREE.CurvePath>	// 2d/3d spline path to extrude shape orthogonality to
+ *  extrudePath:	<THREE.CurvePath>	// 3d spline path to extrude shape along. (creates Frames if .frames aren't defined)
+ *  frames:			<THREE.TubeGeometry.FrenetFrames> // containing arrays of tangents, normals, binormals
  *  bendPath:		<THREE.CurvePath> 	// 2d path for bend the shape around x/y plane
  *
  *  material:		 <int>	// material index for front and back faces
@@ -109,7 +110,10 @@ THREE.ExtrudeGeometry.prototype.addShape = function( shape, options ) {
 
 		// Reuse TNB from TubeGeomtry for now.
 		// TODO1 - have a .isClosed in spline?
-		splineTube = new THREE.TubeGeometry.FrenetFrames(extrudePath, steps, false);
+
+		splineTube = options.frames !== undefined ?
+			options.frames :
+			new THREE.TubeGeometry.FrenetFrames(extrudePath, steps, false);
 
 		// console.log(splineTube, 'splineTube', splineTube.normals.length, 'steps', steps, 'extrudePts', extrudePts.length);