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352 | ChApter 9 ConCeptual Design anD Design analysis

Figure 9.38
Default perimeter
zones

Let’s create a slightly more accurate representation of our building core with a quick exercise.
We will continue to use the c09-Analysis-Start or c09-Analysis-Start-Metric file. To get
started, follow these steps:
1. From the Analyze tab in the ribbon, click to deselect the Enable Energy Model setting.
You should see the massing form as you did at the beginning of the exercises in this
chapter.
2. Switch to the Massing & Site tab and click In-Place Mass. Name the new mass Building
Core and then click OK to continue.

3. Orient the default 3D view to a plan view. You can do this by clicking Top on the
ViewCube. In the Create tab of the ribbon, choose Reference, the Rectangle draw tool,
and the Draw on Work Plane setting. Make sure that Level 1 is specified as the Placement
Plane in the Options bar.
4. Draw a rectangle next to the tower massing form, as shown in Figure 9.39. The exact size
is not important for the purpose of this exercise. We just want it to fit completely inside
the tower massing form after we extrude the shape.
5. Orbit the 3D view back to an orthogonal projection. Click the Modify button in the ribbon
(or press the Esc key), and select the rectangular sketch. From the contextual tab in the
ribbon, click Create Form ➢ Solid Form and then choose the In Context option to generate
a solid extrusion.

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