javascript - Camera not tracing the path properly -

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i followed this example in three.js . in example camera , curve mesh added object 3d .

in case not doing it,since need place mesh on dynamically created texture .

the issue facing here , curve made added scene, camera not tracing path properly. have copied code animating splinecamera in animate function , made changes . please have to
my code

a portion of code in animate function 

var time = date.now(); var looptime = 20 * 1000; var t = (time % looptime) / looptime; var pos = tube.parameters.path.getpointat(t);  pos.multiplyscalar(2); var segments = tube.tangents.length;  var pickt = t * segments;  var pick = math.floor(pickt);  var picknext = (pick + 1) % segments; binormal.subvectors(tube.binormals[picknext], tube.binormals[pick]); binormal.multiplyscalar(pickt - pick).add(tube.binormals[pick]); var dir = tube.parameters.path.gettangentat(t);   var offset = 15;   normal.copy(binormal).cross(dir);  pos.add(normal.clone().multiplyscalar(offset));   splinecamera.position.copy(pos);  var lookat = tube.parameters.path.getpointat((t + 30 /tube.parameters.path.getlength()) % 1).multiplyscalar(2);  if (!lookahead)   lookat.copy(pos).add(dir); splinecamera.matrix.lookat(splinecamera.position, lookat, normal); splinecamera.rotation.setfromrotationmatrix(splinecamera.matrix,splinecamera.rotation.order);  renderer.render(scene, splinecamera);

whether missing anything


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