Source SDK Game Development Essentials
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Summary

Navigating in all the viewports is simple once you get the hang of it, and it's vital to be comfortable with your mapping environment if you want to create spectacular maps. In the 3D view, you can use only the mouse, the mouse and Space bar, or the left mouse button and W, S, A, and D controls to get around. The 2D viewports can be easily navigated using a combination of mouse wheel zoom, Space bar and the left mouse button panning. Selecting objects is as simple as clicking on them in either view, and if you want to keep your map organized, VisGroups are the way to do it! The next chapter puts these tools to use. So now that you know how to get around, let's start creating!