To model a building in Aurora, click on Site Model in the left side toolbar. Next, click on the Draw Roof button in the right toolbar. Then, define the roof structure by placing nodes and edges in the CAD interface, making sure to place a node wherever two or more edges meet. You can double-click on a node to extend a new edge from it, and click on a node, whilst drawing an edge, to connect the current edge to it. Right-clicking while drawing will cancel the current edge.
Once you have defined the roof structure, click on Analyze Roof Structure in the top center of the screen(or hit x), to have Aurora automatically analyze the roof structure. This will automatically populate an azimuth arrow for each roof face and any saved jurisdiction setbacks. If Aurora didn't detect the roof structure well, this is often because you missed an edge, or incorrectly modeled the interior roof structure. In this case, correct your mistake and run Analyze Roof Structure again. If the azimuth arrows are still incorrect, you can click and drag to swivel them until they face the right direction. If you want to make a roof face flat (so it has no slope), click on the azimuth arrow. The yellow arrow will turn into a yellow circle, indicating a flat roof. Click on it to make it a tilted roof face again.
Check out more about 2D modeling here.
Once you have defined the roof structure in 2D, you can further refine it in 3D. Toggle between each view by clicking in the top left corner.
In 3D mode, you will see a 3D model of your building that Aurora has created for you. If you now click on Lift Roofs button in the right hand toolbar, Aurora will try to automatically set the pitch of the roof faces to about 20°. Clicking Flatten Roofs in the right toolbar will make all roof faces flat again (i.e., set the tilt back to 0°). Alternatively, you can also select a roof face and specify it's tilt (in degrees) or slope (rise over run). Note that any changes in tilt will automatically propagate across the roof. Often, setting the tilt of one roof is sufficient, because it implicitly defines the tilt of the other roof faces.
If you'd like to learn more, check out this article demonstrating additional tips on 3D modeling here.
While modeling the roofs of most buildings is quick and easy, once in a while you may come across a complex roof. If you are struggling to model this correctly in Aurora, drop us a line at firstname.lastname@example.org and we'd be happy to help.