![]() ![]() Create a floor plan view (I am going to assume the architect knows how to do this part) and hide all categories not essential to representing the building footprint.Ģ. Establishing Shared Coordinates in Site Model (Just one Method) The Architectġ. If, however, the architect is not going to create a realistic topography of the site, then the following steps may be carried out in the Building Model. Ideally, the architect should create a Site Model separate from the Building Model, especially if the intent is to build accurate topography for rendering purposes. This information exchange requires some back-and-forth in data sharing that should start with the architect. To best coordinate the Architectural Building Model with the Civil Site Plan, Revit and Civil 3D need to share some information with each other. The Survey Point (when used correctly) orients the building geometry in another coordinate system, such as Civil 3D and established “True North” of a Revit project (see Figure 2).įigure 2 What Revit and Civil 3D Need from Each Other Although the Survey Point can represent something like a geodetic survey marker, it can also represent any known physical location on or adjacent to the physical site. ![]() The Survey Point represents a known point in the real world. The PBP also establishes the “Project North” for laying out the building plans on sheets. Spot Coordinates and Spot Elevations that reference the project coordinate systems are displayed relative to this point. The PBP is often used to define the location of the building on the site. The Project Base Point (PBP) defines the origin of the project coordinate system, which may (or may not be) the same as the Startup Location (see Figure 1). Spot Coordinates and Spot Elevations set to Relative reference this location. However, because civil engineers use State Plane Coordinates (or something similar) to establish the project location, linking a Civil 3D plan in Revit by the 0,0 point is less than helpful. This is analogous to the 0,0 point in AutoCAD®. The Startup Location is the original position of the Project Base Point of a new project. Let’s start with some basic Revit terminology. In other words, to use a common phrase among Revit users: You have to know “What Revit wants” before it can do what you want. When Revit interpolates the elevation points acquired from a DWG, it undergoes a triangulation process with the two nearest adjacent points and extrapolates the topography.Īssigning “real-world” coordinates to a Revit project requires some input and an understanding of how Revit “sees” its location. These data types include applying rules in how the data is connected, no control lines, feature elements, breaklines, etc. It is crucial to understand that while Revit can link and import DWG files into the project environment, and can extrapolate topography based on connecting a series of points derived from a CAD file, Revit is not able to incorporate certain types of data that Civil 3D takes for granted. Some Limitations of Autodesk RevitĪutodesk Revit is… well… Revit. However, the strengths and limitations of both Revit and Civil 3D cause miscommunication and misinterpretation that can result in the above conversation. Everyone wants to get along and create a well-coordinated site plan. Back September 23rd, 2016 Better Site Coordination and Topography: An AutoCAD Civil 3D and Revit WorkflowĬivil Engineer: Why doesn’t Revit have a project base point?Īrchitect: Revit has a project base point.Ĭivil Engineer: Then why doesn’t it reference the “Real-World” base point from our survey?Īrchitect: Well, why does your DWG come in way out of left field when I insert your file into my project?Ĭivil Engineer: Because you’re using the wrong 0,0 point.Īrchitect: Why can’t you just relocate the corner of my building to the 0,0 point?Ĭivil Engineer: Why can’t you move your project base point to reflect where the building actually sits in the real world?Ĭoordinating the Autodesk® Revit® building model with the AutoCAD® Civil 3D® site plan has been a thorn in the side of many project teams.
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