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- http://weixin.niurenqushi.com/article/2017-05-15/4850259.html
- http://bbs.cgwell.com/forum.php?mod=viewthread&tid=10078
- https://zhuanlan.zhihu.com/pixelife/26409746
- http://blog.csdn.net/candycat1992/article/details/50167285
//Copyright 2017 Beijing ShengYing Film Animation Co.Ltd
//Holding and Maintaining by Kevin Tsui
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.