What is actually a "Graphic Group"?

Hi.

I see 2 ways to create a Group in MicroStation:

- Group

- Named Group.

Group is very limitated because I understand we cannot add/remove elements later. And it is basically a Cell.

I understand that "Graphic Group" is a Named Group...

Because tools such as "Add to Graphic Group" and "Remove From Graphic group" are only for "Named Groups".

http://www.mdlapps.com/microstation/ustnhelp286.html#F26021

There is also "Graphic Group Lock" (ON /OFF) for Named Groups.

Why Bentley differenciates between Graphic Group and Named Group? is not the same? Is the old name of Named Group?

Thanks.

Parents
  • Hi Joan,

    Why Bentley differenciates between Graphic Group and Named Group? is not the same? Is the old name of Named Group?

    As Jon explained, they are not the same. There were invented for different formats, internally implemented in very different way and offer different set of features.

    In MicroStation, you can find more features and tools with similar functionality. These duplicity exists because of long MicroStation history, when old features have to be maintained, even when replaced by new tools.

    I understand that "Graphic Group" is a Named Group...

    GG and NG are completely independent and separated. I think there is no overlap, so no settings can be used both for GG and NG. It's true that Add to GG tool allows to add element(s) to GG or NG, but technically they are two tools, represented by one icon.

    Group is very limitated because I understand we cannot add/remove elements later. And it is basically a Cell.

    Yes, they are limited (because of GG concept age), but you are not right in the rest of your statement.

    Graphic Group is the feature inherited from DGN V7 format. It's "a number only". All elements with the same value belong to the same graphic group. When GG lock is on, elements in the same GG are treated as one element. When the lock is off, GG information is ignored.

    It's possible to manipulate with GGs (there are Add to GG and Drop from GG tools), but it is not very user friendly.

    Named Group

    As Jon wrote, Named Group is modern variant (a successor) of GG. They were invented when DGN V8 format was introduced.

    NG offers plenty of new features:

    • They are "named", instead of "no information" number of GG
    • They can be hiearachical
    • An element can belong to more NGs at the same time (whereas element can belong only to one GG)
    • NG can contain elements from active model, from direct references and also nested references
    • Propagation rules can be set

    Some MicroStation tools still use GG to work as in the past, but for user, NG should be the first and the only choice.

    With regards,

      Jan

    Answer Verified By: Joan Martínez Serra 

Reply
  • Hi Joan,

    Why Bentley differenciates between Graphic Group and Named Group? is not the same? Is the old name of Named Group?

    As Jon explained, they are not the same. There were invented for different formats, internally implemented in very different way and offer different set of features.

    In MicroStation, you can find more features and tools with similar functionality. These duplicity exists because of long MicroStation history, when old features have to be maintained, even when replaced by new tools.

    I understand that "Graphic Group" is a Named Group...

    GG and NG are completely independent and separated. I think there is no overlap, so no settings can be used both for GG and NG. It's true that Add to GG tool allows to add element(s) to GG or NG, but technically they are two tools, represented by one icon.

    Group is very limitated because I understand we cannot add/remove elements later. And it is basically a Cell.

    Yes, they are limited (because of GG concept age), but you are not right in the rest of your statement.

    Graphic Group is the feature inherited from DGN V7 format. It's "a number only". All elements with the same value belong to the same graphic group. When GG lock is on, elements in the same GG are treated as one element. When the lock is off, GG information is ignored.

    It's possible to manipulate with GGs (there are Add to GG and Drop from GG tools), but it is not very user friendly.

    Named Group

    As Jon wrote, Named Group is modern variant (a successor) of GG. They were invented when DGN V8 format was introduced.

    NG offers plenty of new features:

    • They are "named", instead of "no information" number of GG
    • They can be hiearachical
    • An element can belong to more NGs at the same time (whereas element can belong only to one GG)
    • NG can contain elements from active model, from direct references and also nested references
    • Propagation rules can be set

    Some MicroStation tools still use GG to work as in the past, but for user, NG should be the first and the only choice.

    With regards,

      Jan

    Answer Verified By: Joan Martínez Serra 

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