Join Eric Wing for an in-depth discussion in this video 2D or not 2D: Do I fully model everything?, part of BIM Tools Weekly.
- [Instructor] Overmodeling. It's almost as bad as undermodeling. I see both happen quite a bit. I'm also from time to time guilty of both of these as well. So, where do we draw the line? Here's just a few things I like to look out for. The first thing is importing. This is actually the biggest culprit. Although it's tempting to import a plane or car from SketchUp or a giant conveyor system SAT file that has everything modeled, including all the motors, bolts, switches, and belts. It looks cool and it's usually dead-on accurate, but hold the phone here.
You just crushed the model. Use these things, but clean 'em up. For SketchUp stuff, try to bring it into Navisworks and not even bring it into Revit. You might not need to. Or what I do a lot is make a separate Revit model and then link it in. One other thing is when you're importing CAD to create a family, please delete the CAD when you're done. That's another huge culprit. And speaking of families, avoid the void. Yeah, I've found the overuse of voids can start hitting your performance.
I've had to teach myself to model differently. You can't avoid all voids, but just be mindful that they can cause degradation if overused. Do you really need it? Do you? Do you need the lamp on that desk? (laughs) My favorite story was once I had this slow, problematic model. It was a hospital, but not 600 meg worth of hospital. Come to find out, someone had modeled a bowl of M&M's. The M&M's were also modeled separately, complete with voids to get the shape. Then that bowl full of about 100 of these was copied around to every room in the joint.
Don't do that. But sometimes you have to. Sure, for rendering sometimes you need to get it exact and perfect. All I can say here is it might be best to do that stuff in a different model or dumb it down when you actually win the project. Crazy parameters. You know the ones. I love doing this stuff. Just watch out for overconstraining your families. It's not hard to do. Especially watch out for line-based families with array parameters in there. Man, they can cause trouble. (laughs) All the cool kids are doing it.
Yeah, and you should make your families and models awesome. We need to find fun in what we're doing somehow. Just try and use proper techniques. You can create awesome models, but do it with the health of the overall model in mind. So, what's the minimum? That's one's easy for me, 'cause I'm the laziest person around. Just make the family functional. Make it resemble what it is you're modeling. But mostly make it dimensionally accurate. So that's my take on 2D or not 2D. Let me know if you have any other good examples you'd like to share.
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