# SST_1802 – Creating A Site Model

A site model is a 2D and 3D representation of a mathematical model that is based on 3D data. In simple terms, a site model is a 3D digital version of your site. You can use it for visualization, solar studies, cut and fill calculations, and much more.

## What Is A Site Model And What Can You Use it For

A Site Model is a way of looking at 3D data (spot levels or contours) in a way that allows you to see complex information as a simple 3D model. You can only make a Site Model if you have Vectorworks Architect, Landmark or Designer.

When you create a Site Model, Vectorworks will make an object that can show one type of information in a 2D view (2D contours) and a different type of information if you are in a 3D view (3D contours or extruded contours, etc.). Using this hybrid object is a good way of combining the 2D contours and the 3D Site Model into one object. If you are used to earlier versions of Vectorworks, then this will be a very different way of working.

Contours. If you put in a series of 3D spot levels, you can use your Site Model to show the contours, setting the height between the major and minor contours.

Visualization. You can create a 3D model of the site to help you see the building sitting on the site. Then you can use this to place your building, tree and landscaping. Or, you could use the model to show the client how the site looks from different angles.

Height In Relation To Boundary. You can use the model to analyze the height to boundary (recession) planes to see how close to the boundary you can build by cutting a section through the site, or you can place the building model on the 3D mesh and create your height-to-boundary planes to see if the building passes through these plans. If it does, you can see by how much.

Cut and fill calculations show the difference between an existing Site Model and a proposed Site Model. Solar studies can show the difference in the sun between summer and winter.

## How Is A Site Model Made?

Vectorworks uses the 3D information to create a 3D representation of the data. The way it does this is to look at adjacent 3D data and create a 3D polygon between the nearest three points.

Then it looks at the next adjacent points and makes a 3D polygon between the loci.

Vectorworks carries out this process for all the loci.

The 3D polygons are combined into a site model. The extent of the polygons forms the extent of the site model.

When the site model is created, Vectorworks will create the 2D representation of the site model, the 3D model, and a mathematical model that includes all the data and allows you to create modifiers, cut and fill calculations, and the surface heights of the Site Model.

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