Revit Source Best Practices

Questions about the drawing mapping dialogs, drawing mapping process, and about best practices in generalizing source drawing layers / blocks / annotation attributes to DraftLogic Electrical destinations.

Revit Source Best Practices

Postby forumadmin » Fri Aug 03, 2012 1:17 pm

Properly exported from Revit and then prepped in DraftLogic Electrical, Revit 2D floor plan DWG exports can be one of the highest quality source drawings seen for DraftLogic Electrical. This forums entry compiles the best practices for making a Revit export all it can be and then utilizing that good source in DraftLogic Electrical.

Thanks go to Chris for pointing out a very important checkbox on the Revit 2D floor plan DWG exports-- 'Export rooms and areas as polylines'. See the attached screen cap for the exact location of this checkbox in the Revit 'Export CAD Formats - Views / Settings' dialog. With this checkbox on for an export, the DWG files that result from a Revit export should include an A-AREA layer with closed polylines on it (layer name may differ since it can be selected by whomever does the export). After checking the polylines to ensure they are all desireable room inner boundaries, just rename the layer to the DraftLogic Electrical room boundary layer or copy the desired closed polylines from A-AREA to the DraftLogic Electrical room boundary layer, i.e. zDL_ROOM_BDRY. If you are going to run Drawing Mapping, WBLOCK the A-AREA layer out to reinsert it after Drawing Mapping. This needs to be done since as of this writing we don't have destination categories in Drawing Mapping for 'ready to use' room and floor boundaries--watch for that on a future release.

If you are lucky, you may also end up with closed polyline area lines showing the outer perimeter of each floor that you can move to the zDL_FLOOR_OUTLINE layer and save you from drawing the floor boundaries. If this is the case, remember you still need to use the 'Edit Floor ID' tool to assign the floor number to each and every floor boundary (happens as part of the process when using the DraftLogic Electrical floor boundary tool, but you are skipping that tool if you are using closed polylines created in another manner).

If you desire, you can also leverage off the walls, windows, doors, and room annotation provided in a Revit export to DWG by doing Drawing Mapping and then renaming some layers instead of running Automated Room Creation. Specifically, perform Drawing Mapping as you usually would and then instead of running Automated Room Creation rename as follows:
Any Tbar and room annotation in the source will end up on the DraftLogic Electrical layers you need them on as part of the Drawing Mapping, so no change for them after Drawing Mapping completes (i.e. zDL_T-BAR and zDL_ROOM_ID).

Once you have renamed the layers above & the room boundary layer, place a single room ID in any room. After you have at least one Room ID block in the drawing, execute the 'Complete Room Review' process in Drawing Discovery to have DraftLogic Electrical place Room IDs in all remaining rooms, during which time it will take what it can from the room annotation you placed on zDL_ROOM_ID and use the room type search string matching to make best efforts at automatically selecting room types for you. FYI, we'll be removing the 'need at least one Room ID' to start constraint on the 'Complete Room Review' process soon.

Alternatively, run Drawing Mapping + Automated Room Creation as you normally would and then delete the Automated Room Creation room boundary layer and replace it with the A-AREA layer polylines.

If it is you or someone in your company performing the Revit export to DWG for you, you can make almost all of the above happen as part of the Revit export process & save that customized script! This means that all you would need to do for such a Revit export is quickly review for errant lines (in a drawing we reviewed, there were a few stray lines on the A-AREA layer), perform the 'Complete Room Review' process detailed above, and then jump right into the Systems Placement phase of work. That's right, you can basically entirely skip the Drawing Discovery phase of work with a well scripted Revit export to DWG! We hope to be able to provide you with this dream script sometime in the future...let us know if you make one you are willing to share.

We may not have 'seen it all', but we certainly have 'seen most of it' in regards to source data for a building electrical design job. Please send us your source drawings before you start for us to provide a quick review and recommendation of what the best process you could follow to prepare that particular drawing for use in DraftLogic Electrical.

Red box shows the all-important checkbox to get those valuable area lines!
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