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Conceptual Grading
ChaPter 13
SketchUp Conceptual Grading
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SketchUp models should realistically portray architecture, surfaces, and objects. An important part of the built and natural environment is terrain: the slopes, grades, and elevations that define peaks and valleys. When it comes to 3D modeling, creating representations of terrain tends to be difficult. However, terrain can be realistically represented, and it does add important definition to a model.
Traditionally, terrain is included in 3D models using a Digital Elevation Model (DEM). A DEM is a 3D representation of terrain constructed from contour lines or elevation points; in most cases, it represents existing conditions that have been physically surveyed and inputted into a computer.
Because working with DEMs can sometimes be challenging, this chapter explores an alternative to working with DEMs, SketchUp Conceptual Grading.
Conceptual Grading
Most SketchUp models represent 3D volumes and details on a flat site. They do not typically include terrain or grade. Any vertical relief in a site plan is accomplished with Push/Pulled volumes of elevated areas, typically steps leading to another flat surface.
However, SketchUp can create simulated terrain without a DEM by using the Sandbox tools. With the Sandbox tools, elevations can be sculpted to create identifiable landforms and slopes to achieve a specific look, feel, and scale. The basic approach is no different than adding volume to traditional SketchUp geometry using the Draw and Modification tools. From Contour is the
