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Forums >> Revit Building >> Technical Support >> Creating Families - bugs, limitations or my ignorance?

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Tue, Apr 5, 2005 at 1:01:06 AM | Creating Families - bugs, limitations or my ignorance?

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ant


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I always seem to have enormous problems creating family parts. Once they get to a reasonable degree of complexity they don't seem to behave in a logical manner. As an example I've attached a fireplace/chimney part. Not that complex, but pretty much all dimensions are instant parameters. One parameter, chimney offset, doesn't do anything when you first change it. Then change the chimney height and bingo! it displays correctly. From then on chimney offset works. Why??? Chimney height is complete unrealted to chimney offset. Is anyone else having problems creating families? I'm not sure if Revit is buggy, or the editor is just not capable of adequately showing the various constraints to the user once the model gets a bit complex, or I am dumb as dog curse. Good revit families are surprising rare. Is it because they are too difficult to make?

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Tue, Apr 5, 2005 at 4:49:48 AM | RE: Creating Families - bugs, limitations or my ignorance?

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I really don't thing good revit families are rare. I found people tend to do a lot of sharing of families when they are just starting out in family creation in order to get good faith and hope someone will help them out. When people start to become fluent in creating families and there custom library becomes advanced a lot of people no longer visit these sites and prefer to make there own families within the guidelines of there office standards. So as to the revit family editor being buggy, i strongly disagree. With regards to your fireplace i can see numerous problems. Here are a couple of guidelines to abide by: Never dimension to objects outside of there sketch. Use reference planes to create an invisible framework to control the family. Always dimension off reference planes. Constrain solids/voids from within the sketch where appropriate, then in the third dimesion control by locking to reference planes. When drawing a sketch it is not always the best idea to just click all the locks as sometimes it isn't clear which elements these locks are actually associating themselves to. You are better off drawing the shape, then aliging those lines with reference planes and control lines that aren't on reference planes by dimension from reference planes to the lines. HTH.

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Sun, Apr 10, 2005 at 6:23:51 AM | RE: Creating Families - bugs, limitations or my ignorance?

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Mr Spot, Your latest offering is a heaven-sent; being new to Revit I find creating families the most difficult part of the program - so far anyway, and need to find out as much as I can. I logged in to commend you on your tutorial on the louvres and also to ask what happens when I use your louvres or any other families downloaded in respect to copyright. Would you be posting anymore tutorials on family creation? If so could you please put a few little side notes as to why certain things are being done - for novices like me (and I'm sure there a lots out there). Thanks.

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Mon, Apr 11, 2005 at 2:58:38 AM | RE: Creating Families - bugs, limitations or my ignorance?

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Always appreciate feedback. I typically create tutorials at first for my office and then share these. So I tend to create tutorials if i'm getting a lot of questions about how to do a certain thing. It is a bit hard sometimes to do know what to explain and what not to, as to much explanation and i'd imagine it would make it more confusing. As for copyright, my personal opinion is (irrespective of any legal issues) that people supply families to sites like this with the intent to help others as well as eventually promoting them into sharing their creations. As such I'd don't have any problems with people using my families in commercial projects, however i would be upset to find people selling families that i'd put a lot of work into and making a direct profit from them by passing them off as there own. Which i don't expect anyone would. Given that families are so easily created when you get the hang of it. Don't worry about having problems with family creation as beginner. This is IMHO the most difficult and hardest to master part of Revit. That said though i find this part of the program much easier to do than other CAD packages on the market. Cheers.

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