parametric association constraint lost

 I was playing around with constraint and notice a bug

Draw a simple slab

draw a  block shape constrain the corners using the coincident constraint

Test the constraint  by changing the size of the slab and it works

Take that shape and project it to a new solid.

Test the constraint again and it works.

Modify the is a slab in any way and the coincident constraint is lost. Sometimes on all points and sometimes a couple.

This is just like the annoying associating dimensioning with solids. You modify the solid and all dimensions lose association.

 I suppose there is not a quick way to fix the broken constraint.

It would be nice to select the solids with a fence or the select tool and either use auto constraint or choose the constraint that was lost. 

  • Might be worth providing details of the software and version being used as this can make a difference in relation to Parametrics.

    MicroStation Forum best practices

    Regards
    Andrew Bell
    Technical Support
    Bentley Systems

  • Watch the message center like a hawk when doing any parametric modeling.  3D constraints will drop very randomly when the software thinks it's over constrained.  Sadly I've yet to see any really good training out of Bentley for this lots of pre-canned sales like video's but nothing that represents what the users deal with.  My best results come from basically watching the message center with every new thing i do.  When i see the message that a constraint has been lost i undo a few steps and try to wrap my head around why the software doesn't like what i did.

    It's hard to believe but the feature modeling in v8i was actually better then the parametric modeling we have now.

    This has been my experience from launch through U13.1 in Connect.

    Good luck!

    -Grant

  • Thanks for the warning. Thats really not productive. trial and error... oh no lets try this. Crap that didnt work like I thought it would. 

    Kirk

    I Wish Cadland was Reality

  • I find it honestly embarrassing how many hours (50-60) i have into this freaking stair and it still only works a little bit correctly.  It has multiple logical statements so the user only has to type in the over-all rise and it builds a OSHA legal industrial stair and lets you adjust the number of steps if desired inside of a range which keeps itself legal.

    It chugs for 2+ minutes whenever i change a value.  Worse yet half the time you rotate the finished cell as a still complete parametric it explodes into something Picasso  would admire.  Worse yet is if I drop status on it the constraints on the stringers rotate at an angle i still cannot wrap my head around and the end up around 90 degrees wrong.  I can rotate them back and it sorta fixes itself but it's honestly more trouble then it's worth to use.

    -Grant

  • I love the Picasso comment

    Bentley this is no way to keep your customers happy. 

    I being forced to update to windows 10 and Microstation Connect. I don't like either

    Kirk

    I Wish Cadland was Reality