I would like to know if there's some kind of information that assures me if the. Some modelings are too complex for Revit to handle. I don't know what happens for some models works and some don't. Then I tried to subtract using cut, but didn't worked, as you can see at "SAMA 06". On image "SAMA 05", I transformed it into void. I tried to import another section of the model, see image "SAMA 04". But when I partially explode the model, it disappear, as you can see at image "SAMA 03". As you can see at images "SAMA 01" and "SAMA 02", one section of the model where imported correctly. But, when I imported and partial exploded, it disappeared. The blue one, on image "Caixa Espiral 02", has the same properties and was modeled as the same way as the green one. On image "Caixa Espiral 01" I modeled at ACAD the green one using lofts and transformed it into void on Revit, this one worked perfectly. I have two different models, attached you'll see a zip file with all images. Well, let me try to explain more clearly. I'm new on community and I'm learning how the things work here. There seems to be other limits as well and it would be really nice if someone from Revit would come out say what the limitations are so we would know how to avoid did asked in another topic. Certain surfaces are just too complex for Revit to handle, and the mysterious rounding off/ precision limit that one encounters all over in Revit (though one hears virtually no official comment aboout this) seems to apply here as well - for example radii or surfaces too tight will cause your polysurface to disappear upon being exploded. However Revit can be extremely finicky about these entities - the must be well formed solids or closed polysurfaces, but that is just the start. In any case however, Revit will now (in general) allow one to import Nurb bodies and 3d Solids which you can then explode and treat almost like Revit entities - assign them materials even stretch them etc. Sometimes edges can be hidden in ACAD which makes meshes a little more palatable. You can import Meshes, but they will look awful in your model and consume a lot of memory. Yes, if you can model things in Revit you will be better off, but there are a lot of 3d modelling operations (edge filleting e.g.) which is tedious or even impossible in Revit, moreover sometime you are inheriting a model from somewhere else and you just need to get it in your project quickly. Unfortunately there is a lot of mis-information and non-information on this topic.
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