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Sometimes, you need to draw temporary lines while you model. These temporary lines, or guides, are useful for lining up things, making things the right size, and generally adding precision and accuracy to what you’re building.

Guides are special entities that you create when and where you need them. They aren’t part of your model because they’re not edges or faces, so you can choose to hide them or delete them; like other annotations, they don’t affect the rest of your geometry.

Figure 3-26 shows an example of guides in action. The guides are positioned 12 inches from the wall and 36 inches apart to draw the sides of a doorway. Another guide (6 feet, 8 inches from the floor) indicates the top. With these guides in place, you can easily draw a rectangle, bounded by your guides, that you know is exactly the right size and in the correct location.

FIGURE 3-25: Define a custom axis of rotation by click-dragging.