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AIS_Trihedron can't be displayed with OCC6.5.1

fatmice's picture
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AIS_Trihedron can't be displayed with OCC6.5.1

I want to display Trihedron,and the selection mode setting is 3:

Handle_AIS_Trihedron aTrihedron;
Handle_Geom_Axis2Placement aTrihedronAxis=new Geom_Axis2Placement(gp::XOY());
aTrihedron=new AIS_Trihedron(aTrihedronAxis);
aTrihedron->SetSelectionMode(3);
myAISContext->Display(aTrihedron);
but aTrihedron can't be displayed.
please help me,thank you!