Introducing ZSpheres
ZSpheres are accessed like any other tool in ZBrush: from the Tool menu. The ZSphere icon 
is located under the Startup 3D Meshes section of the Tool menu (Figure 6-2). Clicking the ZSphere icon allows you to draw a ZSphere on the canvas.
When a ZSphere is drawn on the canvas, you must enter Edit mode as with any other ZTool. Doing so establishes this first sphere as the root of your ZSphere chain. Any other spheres you draw will have to connect to this first sphere. As you work, you can move this sphere but you can never delete it—you can delete other ZSpheres at will, however. The chain created with a ZSphere will be converted ...
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