■ Using the Topology Tools 241Figure 7.35 The reprojected head
Importing Topology: Three Methods
Topology does not have to be built in ZBrush. You can import a low-polygon mesh generated
in another application into ZBrush.
When you elect to create new topology in a program outside ZBrush, the typical workflow
is to export the highest resolution of the ZTool that your modeling application can open. Using
the high-res as a template on a layer, build a low-resolution envelope mesh on top (Figure 7.36).
This is an ordered mesh where each point sits just outside the surface of the high-res.
Figure 7.36 Building an envelope mesh in Maya
There are five methods of changing your topology in ZBrush:
• You can import a subtool of the new topology and use the Project All feature to
transfer the details.
• You can import new topology directly into the level 1 of the ZTool, to add new
shapes like horns or other protrusions or to change the underlying mesh flow
entirely. ZBrush will automatically transfer your subdivision levels to the newly
imported tool.
• You can draw new topology directly on the Z Tool, as you saw in the previous example.
• You can import topology into the Retopology tool that has been built outside of ZBrush.
• You can use GoZ to transfer your model to another supported 3D application.
Topology changes can be made here, and then transferred back to ZBrush where
the original subdivision levels will be transferred to the new mesh.