Revit Nested Family Statistics Quantity
When loading two components with identical appearances into a project, you might want to extract the volume of parts such as support towers, box beams, abutments, and pile foundations. In Revit, detailed schedule features naturally come to mind for this task.
BIM technicians have explored creating components separately and then assembling them into new families through nesting within the family editor environment. Once everything is set up, you can navigate to Load Project → View → Detailed Schedule → Conventional Model → Available Fields. However, the resulting table below shows that the volume of each component was not counted as expected.
Here, the editor offers two methods for your reference:
- Using the detailed schedule with material extraction: By selecting the available fields, you obtain the results shown below. The total volume represents the overall volume of the component, the material volume reflects the volume of the subcomponents making up the component, and the quantity indicates the number of those components.
From this table, you can see that even though the support tower consists of two support towers, they are merged into one during material extraction. To count them separately, materials of the support towers must be named individually.
- Using family sharing before nested assembly: This method eliminates the need for material extraction. By creating a standard detailed schedule, you can calculate the volume of each component separately and list each one in detail, since each family shares the nested assembly.
Material extraction can also calculate component volumes, but there are clear differences if the target is not shared nesting. These differences appear in categories such as ethnicity, type, and volume. The shared family name in the schedule lists all the family names of shared components, while the volume represents the volume of the shared family.
For example, the shared family named Bridge Pier Model consists of two parts: the adapter bearing platform and the pile foundation. This structure makes the composition very clear.
Another advantage of shared families is that they can be split and selected independently within the project, which aligns with the needs of construction simulation. In Navisworks (NW), both methods of creating families allow components to be decomposed separately, but changing materials requires selecting the component for type editing.
Instead of using shared families, materials can be consolidated and modified through type parameters.
Below is an illustration of setting up family sharing. It is important to note that once families have been shared and nested, avoid sharing and nesting the assembled families again. Otherwise, the initially shared families will be counted multiple times.
Two models with seemingly identical appearances can affect their future expansion and application. Therefore, the editor recommends that models should not just be judged by their appearance—what matters more is how they function and how well they can be used.
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