Adding 3D Elements Over 2D AutoCAD
Add 3D Walls to a 2D Underlay - Exercise
As I have mentioned several times, there is no actual 2D to 3D conversion. Rather, we use the information in the underlay, be it CAD, PDF, or scanned images, as a guide to build our BIM model.
To start modeling walls on top of a CAD link, use the following steps:
- Open your Revit project, if not already open.
- Go to your Level 1 CAD Background view.
- Zoom in to the area around the B/1 grid intersection.
- Toggle on Thin Lines (through the Quick Access toolbar or using the TL keyboard shortcut).
- Dimension the two AutoCAD lines that represent a wall, as shown below. It is a 10" wall.
- In the Architecture tab>Build panel, click Wall.
- In the Type Selector, select the Generic - 8" wall and click Edit Type.
- In the Type Properties dialog box, click Duplicate…. Change the name to Exterior - Generic 10" and click OK.
- Click the Edit… button for the Structure, and in the Edit Assembly dialog box, change the Thickness to 10", as shown below.
- Click OK to close the Edit Assembly dialog box.
- Review the properties of the newly created wall type, as shown below, then click OK.
- In the Options Bar, change the Location Line to Finish Face: Exterior.
- Trace the exterior walls, starting in the direction shown below.
- Keep checking the wall widths as you go. If the width changes, change the wall type to suit the width. First check to see if a wall type exists; if not, create one as done previously.
- When the endpoints of the walls are not obvious, project beyond the walls and start another wall, then you can clean up the intersections/corners later with the Trim and Extend commands.
- In order to see the CAD lines underneath the Revit walls, change the visual style to Wireframe, as shown below.
- If unsure what a CAD line represents, use the Query tool to see what layer it is on, as shown below.
- Move on to the interior walls. Select the Interior – 4 7/8" Partition wall type, as shown below.
- Change the Location Line to Finish Face: Interior.
- Create the interior walls.
- If your wall is being created on the wrong side, press <Space bar> to toggle which side the wall is on.
- Repeat this for the entire floor plan, adding walls as you go. Once you finish, you can start building the wall types and add doors and windows.
- Flip to a 3D view to check your progress, as shown below.