How to Draw Roads with Slopes on Terrain in Revit
Revit offers a tool called Subregion that allows you to define specific areas within a terrain surface. You can apply different attribute sets, such as materials, to these subregions to create roads. Importantly, creating subregions does not generate separate surfaces. If you need independently editable surfaces, you should use the Split Surface tool instead.
Before creating a subregion, you must first have a terrain model. Since subregions are based on the terrain, they inherit its slopes. However, placing components on these sloped subregions can be challenging. For host-based family components, make sure to check the option Based on Work Plane in the Family Category and Parameters dialog box. When you select a subregion as the host, the component will automatically align parallel to the subregion’s slope.
If you want to place family components that rely on lines or faces—such as road markings—you may find that you cannot select subregions directly. In this case, you should draw roads differently by using the Building Floor tool. You can find this tool under the Volume and Site Modeling tab in the Building Floor panel.
Use the Building Floor tool to draw the road boundary lines, but don’t click ‘Finish’ immediately. Instead, use the Slope Arrow tool next to the Finish button to apply a slope that matches the terrain’s incline. After setting the slope, click Finish.
Now you can easily place family components based on lines or faces on the building floor without any issues.
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