切线空间(Tangent Space)
http://download.autodesk.com/global/docs/maya2012/zh-cn/index.html?url=files/Polygons_nodes_Tangent_Space.htm,topicNumber=d28e152588
http://azykise.blog.163.com/blog/static/1730802442010431113010224/
http://download.autodesk.com/global/docs/maya2012/zh-cn/index.html?url=files/Polygons_nodes_Tangent_Space.htm,topicNumber=d28e152588
http://azykise.blog.163.com/blog/static/1730802442010431113010224/