What is the difference between Driving Dimensions and some built-in SketchUp tools that can be used to resize my model to satisfy a given dimension?
You can use some built-in SketchUp tools (like Scale or Tape Measure) to set the desired length dimension for an edge (see the SketchUp Reference Guide for details). However, using these tools you can set not more than one dimension at a time. If you set other dimensions previously, they can be broken when you set a new one. In contrast, all Driving Dimensions set to your model are stored and satisfied simultaneously. Even if you change your model by moving or resizing some of its entities, you can use the Update Geometry command (available with the Driving Dimensions toolbar) to satisfy automatically all driving dimensions you set previously to your model. Moreover, Driving Dimensions allow you to control not only the length, but also arbitrary distances, radii and angles in your model.
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