The Sphere Tool plugin created by Jim on the SketchUp [Plugins] Blog is the missing tool in SketchUp’s tool palette and should come with the program originally. This tool allows you to simply make a sphere. All you need to do is go to the “Draw” menu and click “Sphere”, then pick your center point and describe the radius and its done. The tool creates the shape as a group. If only this tool came with a toolbar icon it would be perfect. But a good alternative is to create a keyboard shortcut key. Note: if you have Sketchy Physics then you already have a sphere tool plus other shapes such as a cone and cube.
Overall, the Sphere Tool plugin on the SketchUp [Plugins] Blog is a simple and essential tool. At the time of this review this plugin is free and is available at sketchuptips.blogspot.com. I give this plugin 4 out 5 stars.