How to set axis in STEP

I suppose that I can get the minimal coordinates of all my shapes (but I don't know how) and set axis at this point (may be it is somewhere in Context in viewer?)

Hi, qaqa!

I already use axis-aligned box and can add it to my model.

But problem is I want to know coordinates of the most left and the most down shape from my model to set these coordinates as a new point of origin.

Now I can add a box related to standard point of origin and I don't know how to change it

In the picture you can see a model (very small room - I only load it it is standard loading) and then I add a box with coordinates (-3500, 8500, 0) these coordinates are related the global (0,0,,0) but I want to change (0,0,0) on some coordinates at the left down corner of my room

I use class BRepPrimAPI_MakeBox  : public BRepBuilderAPI_MakeShape from MFC example

I know how to use it:

//! Make a box with a corner at 0,0,0 and the other dx,dy,dz
  Standard_EXPORT BRepPrimAPI_MakeBox(const Standard_Real dx, const Standard_Real dy, const Standard_Real dz);
  
  //! Make a box with a corner at P and size dx, dy, dz.
  Standard_EXPORT BRepPrimAPI_MakeBox(const gp_Pnt& P, const Standard_Real dx, const Standard_Real dy, const Standard_Real dz);
  
  //! Make a box with corners P1,P2.
  Standard_EXPORT BRepPrimAPI_MakeBox(const gp_Pnt& P1, const gp_Pnt& P2);
  
  //! Ax2 is the left corner and the axis.
  //! Constructs a box such that its sides are parallel to the axes of
  //! -   the global coordinate system, or
  //! -   the local coordinate system Axis. and
  //! -   with a corner at (0, 0, 0) and of size (dx, dy, dz), or
  //! -   with a corner at point P and of size (dx, dy, dz), or
  //! -   with corners at points P1 and P2.
  //! Exceptions
  //! Standard_DomainError if: dx, dy, dz are less than or equal to
  //! Precision::Confusion(), or
  //! -   the vector joining the points P1 and P2 has a
  //! component projected onto the global coordinate
  //! system less than or equal to Precision::Confusion().
  //! In these cases, the box would be flat.
  Standard_EXPORT BRepPrimAPI_MakeBox(const gp_Ax2& Axes, const Standard_Real dx, const Standard_Real dy, const Standard_Real dz);

 but I need to change the origin point for my model because I want to give coordinates related to left down corner of my room.

I try to do next thing

auto axis = myAISContext->CurrentViewer()->PrivilegedPlane();

axis.SetLocation(gp_Pnt(-3600., 8500., 0.));

myAISContext->CurrentViewer()->SetPrivilegedPlane(axis);

but nothing happend

I use class BRepPrimAPI_MakeBox  : public BRepBuilderAPI_MakeShape from MFC example

I know how to use it:

//! Make a box with a corner at 0,0,0 and the other dx,dy,dz
  Standard_EXPORT BRepPrimAPI_MakeBox(const Standard_Real dx, const Standard_Real dy, const Standard_Real dz);
  
  //! Make a box with a corner at P and size dx, dy, dz.
  Standard_EXPORT BRepPrimAPI_MakeBox(const gp_Pnt& P, const Standard_Real dx, const Standard_Real dy, const Standard_Real dz);
  
  //! Make a box with corners P1,P2.
  Standard_EXPORT BRepPrimAPI_MakeBox(const gp_Pnt& P1, const gp_Pnt& P2);
  
  //! Ax2 is the left corner and the axis.
  //! Constructs a box such that its sides are parallel to the axes of
  //! -   the global coordinate system, or
  //! -   the local coordinate system Axis. and
  //! -   with a corner at (0, 0, 0) and of size (dx, dy, dz), or
  //! -   with a corner at point P and of size (dx, dy, dz), or
  //! -   with corners at points P1 and P2.
  //! Exceptions
  //! Standard_DomainError if: dx, dy, dz are less than or equal to
  //! Precision::Confusion(), or
  //! -   the vector joining the points P1 and P2 has a
  //! component projected onto the global coordinate
  //! system less than or equal to Precision::Confusion().
  //! In these cases, the box would be flat.
  Standard_EXPORT BRepPrimAPI_MakeBox(const gp_Ax2& Axes, const Standard_Real dx, const Standard_Real dy, const Standard_Real dz);

 but I need to change the origin point for my model because I want to give coordinates related to left down corner of my room.

I try to do next thing

auto axis = myAISContext->CurrentViewer()->PrivilegedPlane();

axis.SetLocation(gp_Pnt(-3600., 8500., 0.));

myAISContext->CurrentViewer()->SetPrivilegedPlane(axis);

but nothing happend

I want to change the position of origin for all model, because I need to add boxes on given coordinates and coordinates will be calculated from left down origin

But as I understood  AIS_InteractiveContext::SetLocation()  is for special object, but I don't know which object at the left down corner

Кирилл, я импортирую степ файл, а затем добавляю коробочку. Начальные координаты коробочки и её размеры я задаю. Но начальные координаты (её угол) отсчитываются откуда-то из середины - видимо там начало координат. Так вот я хочу сменить это начало координат в левый нижний угол комнаты. Чтобы пользователь знал, откуда отсчитывать положение коробочки. 

Oh, ok, qaqa, I see. Thanks I'll think about it