다음은 api 를 간략하게나마 설명한 블로그이다.
http://www.cnblogs.com/radium/archive/2013/06/13/3134152.html
beam으로 좌표계
TransformationPlane myPlane = new TransformationPlane(myBeam.GetCoordinateSystem());
bool result = myModel.GetWorkPlaneHandler().SetCurrentTransformationPlane(myPlane);
global으로 좌표계
TransformationPlane myPlane = new TransformationPlane();
bool result = myModel.GetWorkPlaneHandler().SetCurrentTransformationPlane(myPlane);