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Forums >> Revit Building >> Technical Support >> How do I set an equality anchor?
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Joined: Mon, Oct 9, 2006
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I am working on a roof-based generic model (some sloped roofing insulation) and I am having trouble making my primary (center LR and center FB) reference planes stay put. No matter what I seem to do, the right and left or front and back reference planes that I have set up become the anchored planes in my equality constraint. I tried dragging the anchor symbol to the center, but it didn't maintain the position, and when I clicked on one of the reference planes to re-set the anchor to center, it showed the anchor in a different spot than I had placed it.
I checked the help files in Revit, and it stated that the anchor symbol designates which item stays stationary (which it didn't do) and at the end of the help file, it has this unlinked "note" with no further explaination:
"If you select a different element, this has the effect of switching the position of the anchor too."
Does anyone know how to set the enchor so that it stays? And if anyone who programs Revit is reading this, what is the point of having the anchor change all the time?
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Joined: Mon, Oct 23, 2006
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You may have to reconstruct your reference planes from the default planes associated with the family editor. I would recommend pinning the default plane and working out from there.
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Joined: Sun, Apr 25, 2004
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Reference planes in families will move around when you set the equility constraint unless the L and R reference planes an exact distance apart that is equal to begin with.
The best practice for creating a family is to place all the reference planes and labels before any geometry is added to the family. Then FLEX-FLEX-FLEX to make sure everything works. Try really large numbers for yur parameters and then really small. See what breaks then fix it.
If you follow this practice then it matters not if when initially setting equality that the CL reference planes move.
HTH
Tom
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Joined: Mon, Oct 9, 2006
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I thought that I had done that (setting up reference planes, flexing, placing solids). The problem is that some of my parameters, such as some of my slopes, etc., affect the geometry directly, rather than affecting reference planes that the geometry is locked to. The result is that some of my parameters can't be flexed until the solids are in place.
I can see where flexing more often could help, although it will be difficult to do that on the current family without re-building it entirely. Flexing more often does let people see my awesome pecs and biceps, so there is reason to flex more, as well.
I would like some method of pinning something in place and having the dimensions base off of that. Unfortunately, if I pin the reference planes, it all ends up breaking. What would also be nice is if the error messages actually told me something other than "doesn't work, can't be ignored, error number 8848478, line id #809233290." Perhaps if it said, "reference plane A cannot remained pinned because of distance constraint to reference plane B which is also pinned." I can work from something like that for solving the problem.
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I just re-built the entire thing with the same parameters in the same places but I flexed the reference planes as I went. It worked this time. I don't know why it worked this time. I wish that there was some way to troubleshoot a family rather than having to re-build the entire thing. If anyone has an idea of how to better troubleshoot, it would be much appreciated. There are a number of families that I have no re-built 5 or 6 times because some constraint broke the whole thing and I was unable to find it.
One of the powers that I see in this software is the ability to make complex families with modelled or embedded details. When one does that, the families, by nature, become rather complex. Rebuilding the entire thing (and/or rebuilding nested families and detail components) isn't really a viable answer in the long run.
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Joined: Mon, Jan 12, 2004
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Brakware,
This comes with experience. The more families you make the quicker you'll identify whats causing the family to break. In my first few months of using revit I'd often scrap families and start from scratch, thinking what was I thinking when i made that...
Now, I pretty much get it right the first time every time and if I don't it only takes a moment to realise i've missed something obvious.
All I can say is hang in there.
-----------------------------------
Regards,
Chris.
Co-Founder | BIM Consultant | Software Designer  B. Arch)
Xrev Revit API Addins | Revit Rants |
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