To trace the building shape and create an overall building space

Click

(Trace Room).

Activates the Trace space . Trace space is similar to Trace Room in that it is used to draw a shape to define a space, but does not have the room creation options as for Trace Room.

Keep the Trace space default tool settings, and follow the prompt Trace space > Enter point (on the Status bar prompt area).

Snap to the corner of the mass model coincident with the origin marker (coordinate 0,0,0 in the AccuDraw window), and enter a data point. This establishes the first point on the floor plan.

Continue tracing the building floor plan. Snap to the edges of the mass model, and add data points.

Tip: You can snap to curved shapes more accurately by overriding the default key point divisor (set to 2) setting by keying in ky=8 for instance dividing elements into 8 equal snappable segments as opposed to the 2 using the default.

After defining the last point on the floor shape, right click to Reset out of the Trace Space mode.

A 3D space is modeled with the traced space as its perimeter, and is divided into floors per the Floor Data settings.