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This is the upper half of a building. The red rectangular shape, which
consists of four red lines is the 3D cursor. On the right side, there are
two rectangles already created. They are rendered in translucent grey.
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The left side of the 3D cursor is dragged so that it fits to the edge
of the wall. A rectangle is created there as shown in the next figure.
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The 3D cursor is rotated around the left side. It is rotated 90 degree
by default.
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A side of the 3D cursor is dragged again to the left edge of building.to
create another rectangle...
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