is it possible to check whether the cell instance from the same cell?

Hi experts,

   I have a question about the Cell instances, I have a model created with Microstation CE,   from the Cell Library, I place a Cell( for example, Cell1) three times, then i have three Cell instances in the model,

those 3 instances are from the same Cell library, so they have the same shapes(lines, arcs.. mesh....) , the question is that is there any way i can check those 3 cell instances are from the same Cell defined in the cell library?

thanks,

Rick

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  • Is there any way I can check those 3 cell instances are from the same Cell defined in the cell library?

    You need to distinguish between MicroStation normal cells and MicroStation shared cells.

    Normal Cells

    Normal cells are created as models in a cell library.  When a MicroStation user places an instance of a normal cell, the model is copied from the cell library to the active DGN model.  There is subsequently no connection between the cell instance and the library.

    Usually cell instances are placed at different coordinates.  They may be scaled.  They may be rotated.  A user might assign a new name to the cell, using the Element Information dialog.  Consequently, it could be simple or quite hard to determine whether two normal cell instances are identical or from the same cell library.

    Shared Cells

    When a user places a shared cell instance, the first thing that MicroStation creates is a shared cell definition element in the active DGN file.  The definition is created from the cell chosen from a cell library.  There is subsequently no connection between the shared cell definition and the library.  As the user continues to place cell instances, MicroStation creates a reference to that shared cell definition for each shared cell instance.  Each shared cell instance is quite small, and references its definition in the same DGN file. 

    Each shared cell instance in a DGN model refers to the shared cell definition having the same name.  Usually shared cell instances are placed at different coordinates.  They may be scaled.  They may be rotated.  But they all refer to the same shared cell definition.

     
    Regards, Jon Summers
    LA Solutions

Reply
  • Is there any way I can check those 3 cell instances are from the same Cell defined in the cell library?

    You need to distinguish between MicroStation normal cells and MicroStation shared cells.

    Normal Cells

    Normal cells are created as models in a cell library.  When a MicroStation user places an instance of a normal cell, the model is copied from the cell library to the active DGN model.  There is subsequently no connection between the cell instance and the library.

    Usually cell instances are placed at different coordinates.  They may be scaled.  They may be rotated.  A user might assign a new name to the cell, using the Element Information dialog.  Consequently, it could be simple or quite hard to determine whether two normal cell instances are identical or from the same cell library.

    Shared Cells

    When a user places a shared cell instance, the first thing that MicroStation creates is a shared cell definition element in the active DGN file.  The definition is created from the cell chosen from a cell library.  There is subsequently no connection between the shared cell definition and the library.  As the user continues to place cell instances, MicroStation creates a reference to that shared cell definition for each shared cell instance.  Each shared cell instance is quite small, and references its definition in the same DGN file. 

    Each shared cell instance in a DGN model refers to the shared cell definition having the same name.  Usually shared cell instances are placed at different coordinates.  They may be scaled.  They may be rotated.  But they all refer to the same shared cell definition.

     
    Regards, Jon Summers
    LA Solutions

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