1)创建三个点

2) 将点连成线

3) 通过三点创建一个参考平面，后面进行圆弧倒角时要用到该平面。
CATIGSMPlane3Points_var Supportplane = spGSMFactory->CreatePlane(spPoint1, spPoint2,spPoint3);
CATISpecObject_var spSupportplane = Supportplane;

4) 创建倒角半径的参数：
CATICkeParm_var Radius1 = NULL_var;
CATICkeMagnitude_var spRadMag = spParamDictionary->FindMagnitude("LENGTH");
CATUnicodeString name("Radius 1");
Radius1 = spParmFactory->CreateDimension(spRadMag,name, .01);

5) 创建倒角：
CATIGSMCorner_var Corner1 = spGSMFactory->CreateCorner(spLine1,
spLine2,
spSupportplane,
Radius1,
CATGSMSameOrientation,
CATGSMSameOrientation,
FALSE);
CATISpecObject_var spCorner1 = Corner1;

6) 裁剪去多余的线和点：
CATIGSMSplit_var Split1 = spGSMFactory->CreateSplit(spLine1,
spRadius1,
CATGSMSameOrientation);
CATISpecObject_var spSplit1 = Split1;