In this section of our course, we'll construct the four elevations for our Small House project. Before diving into the construction process, let's examine two fundamental workflows for organizing elevation files in AutoCAD that will significantly impact your project efficiency and file management.
AutoCAD offers two distinct approaches for setting up elevation files that reference a plan XREF to generate elevation data. Unlike modern BIM software such as Revit, which automatically generates elevation views when you modify the plan, AutoCAD requires manual construction of each drawing file. This fundamental difference means that choosing the right workflow from the start becomes critical for project success and long-term maintainability.
On screen, you'll notice two elevation setup configurations. Both reference identical plan data, and I've clearly labeled the plan XREF for visual clarity. You can also identify elevations A, B, C, and D in each setup. The key difference lies in how these elevations are organized and accessed. Let's examine the first approach in detail.
The first method arranges four elevation files horizontally in sequence: A, B, C, and D. Each elevation references the same XREF, but utilizes four separate copies of the plan data. The plan file appears at the top, then gets copied and rotated so each building face points downward toward its corresponding elevation. This arrangement creates an intuitive workflow where you can project geometry directly downward from the building to establish your elevation framework.
This linear approach offers significant advantages for drafting efficiency. Once you establish horizontal datums—whether from plan dimensions or reference PDFs—you can carry those measurements across from one elevation to the next seamlessly. The workflow becomes particularly smooth when coordinating elements like window heads, floor lines, and roof datums that need to align across multiple building faces.
However, this method comes with substantial drawbacks that become more pronounced in complex projects. Loading four versions of an XREF into a single drawing dramatically increases file size, even though these are referenced files. AutoCAD must still load and manage each reference individually, which can impact performance significantly on larger residential or commercial projects. Additionally, buildings with more than four sides—such as contemporary designs with eight or ten faces—make this rotating process increasingly unwieldy. You'll need to calculate precise wall directions, execute multiple rotations, and potentially use XREF trimming to maintain clean, organized elevations side by side.
The second method takes a radial approach that addresses many of these limitations while introducing its own sophisticated requirements. In this configuration, a single XREF sits at the center of your drawing, with each elevation positioned away from its corresponding building face. Elevation A projects downward from its wall, B extends rightward from the right side, and so forth. The ground line always appears furthest from the floor plan, creating a logical spatial relationship.
At first glance, this approach might seem impractical—how could you possibly draw elevation C upside down or elevations B and D on their sides? The answer lies in leveraging two powerful AutoCAD features that work in tandem: the ViewCube and User Coordinate Systems (UCS).
The ViewCube enables you to rotate your 3D view, and its directional arrows allow you to rotate your 2D drawing view to different orientations. However, simply rotating the view isn't sufficient for practical drafting. Notice in the coordinate display that X and Y coordinates maintain their original values even after ViewCube rotation. The text appears upside down, positive X points left, and positive Y points downward—clear indicators that we haven't properly aligned our coordinate system with the new view orientation.
This is where User Coordinate Systems become essential. To access UCS settings, navigate to the View tab, right-click in the gray ribbon space, select Show Panels, then choose Coordinates. The Coordinates panel reveals multiple methods for changing coordinate systems, typically used in 3D modeling applications. For our elevation work, we're primarily adjusting X and Y values while leaving Z unchanged (Z remains perpendicular to our drawing plane and isn't utilized in this course).
The real power emerges when you combine view orientations with custom User Coordinate Systems and save them as named views. Let me demonstrate with pre-configured examples. When I select the "A" view, AutoCAD automatically adjusts to the proper view orientation and assigns the appropriate UCS—in this case, the World Coordinate System (WCS), as shown on the ViewCube.
Switching to view "B" reveals the full potential of this system. Not only does the view orientation change automatically, but the User Coordinate System updates to match. I've created a custom UCS where positive X runs along the ground line to the right, positive Y extends up the elevation, and saved it with the name "B." Similar named UCS configurations exist for views C and D, allowing you to navigate around your drawing while maintaining proper coordinate alignment for drafting and data projection from your floor plan.
When should you choose one system over the other? The decision depends heavily on project complexity, office CAD standards, and team workflow preferences. Many established firms have standardized on one approach, and consistency often trumps individual preference. For this course, we'll implement the radial system with User Coordinate Systems because it represents the more technically challenging approach and provides valuable skills for complex projects.
While I encourage you to experiment with both methods, please reserve that exploration for your own practice time rather than during our structured lessons. After completing this course, redrawing these elevations using the linear system would provide excellent reinforcement of the concepts we're covering.
Before we proceed, ensure your Coordinates panel is visible by going to View, right-clicking to Show Panels, and verifying that Coordinates is checked. This panel will be essential for the elevation work ahead. In our next video, we'll begin constructing our first elevation file using these principles.
See you there.