By Jordan Mussett, IMAGINiT Building Solutions
When exploding to convert details from AutoCAD to Revit, what have you heard people say? Wait! Don’t!
Whoever said this knows about the four demons. When you explode AutoCAD files in Revit Projects, several things happen.
#1 The text from AutoCAD is normally converted to new Revit Text Styles but the name and scale probably won’t be right, especially if the text in the AutoCAD file wasn’t annotative.
#2 All AutoCAD layers become a new Line Style. This doesn’t sound so bad but those Line Styles will be the same color as the layers if you preserved the colors when you imported. Additionally, those line styles will most likely carry a weight of 1. These will need to be tracked down and removed.
#3 All Line Patterns from AutoCAD come over into Revit. Revit already has its own Line Patterns, utilizing a different system, so these don’t compute. These will need to be tracked down and removed.
#4 All visible hatches from the exploded AutoCAD file become new Revit Filled Region types. Again, this doesn’t mean quite as much as the others but these will need to be tracked down and removed.
It might not seem like a problem but it normally does become a problem. Revit projects are just like other projects in that one of the main goals is for the entire drawing set to have a consistent look, like one person drafted the entire project. The more illegitimate Text Styles, Line Styles, Line Patterns, and Filled Regions you have to choose from, the better the chances that user 1 is utilizing a certain combination of those four categories and user 2 is utilizing a different combination. This will easily and quickly conquer the effort to create a cohesive, concise set of Construction Documents.
Practical Advice: Convert AutoCAD details etc. in a separate file. Then utilize “Insert Views from File” to bring that converted detail to the working project. This way, all of the demons stay behind in a file that you will eventually delete. One extra step saves the model manager time and headaches.
As a side note, if you want to explode a line segment that is very small, Revit might not convert it. This dimension is somewhere under 1/32”. This is normally rasterized objects or splines and curves.