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BRepAlgoAPI_Common fails on 2 shapes loaded from files

Dima's picture


I'm new with OCC. Actually I'm faced a strange problem when creating shape intersection.

The code is as following:

IGESControl_Reader reader;
IFSelect_ReturnStatus status =
reader.ReadFile( "D:/work/data/shape.igs" );
TopoDS_Shape first_shape = reader.OneShape( );

IGESControl_Reader reader2;
IFSelect_ReturnStatus status2 = reader2.ReadFile( "D:/work/data/prism.igs" );
TopoDS_Shape second_shape = reader2.OneShape( );

TopoDS_Shape common;
try {
common = BRepAlgoAPI_Common(first_shape, second_shape);
} catch (Standard_Transient& e) {


IGESControl_Writer wr;

Actually OCC drops assertion on "wr.AddShape(common);" and common is not empty but not and intersection.

Guys, any suggestions on this?

Dima's picture

Btw, if try to find Fuse of these 2 shapes, then I get valid union of 2 shapes.

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