ZBrush Tip: Splitting Meshes into Independent SubTools in ZBrush

Splitting a mesh into separate SubTools is an efficient way to isolate accessories, clothing panels, armor pieces, teeth, or any region that needs independent sculpting, transformation, visibility, or export. The key is to prepare the separation carefully so the resulting SubTools remain clean and easy to manage.

Before splitting, duplicate the original SubTool as a safety copy:

• Open Tool > SubTool.
• Choose Duplicate.
• Rename the duplicate clearly, such as Character_SplitBackup.
• Hide the backup to prevent accidental editing.

For precise control, mask the geometry you want to separate. You can paint a mask manually by holding Ctrl, create one from Polygroups, or isolate polygons using Ctrl+Shift selection. Once the desired area is identified, expand or contract the mask if necessary to avoid an uneven boundary.

Navigate to Tool > SubTool > Split and select the command that matches your preparation:

• Split Masked Points separates the masked region into a new SubTool.
• Split Unmasked Points separates the visible unmasked region instead.
• Split Hidden converts hidden geometry into a separate SubTool, making it ideal when visibility selection is faster than masking.
• Groups Split creates a separate SubTool from each Polygroup. Use it when a mesh already contains logically organized components.
• Split to Parts is useful for disconnected polygon islands that need to become independent SubTools.

Be deliberate with Groups Split. A model containing dozens of small Polygroups can instantly produce an equally large SubTool list. Before running the command, merge unnecessary groups with Group Visible or reorganize them through the Tool > Polygroups controls.

After splitting, inspect the boundary at close range. Depending on the source geometry, the operation may expose open borders or reveal a seam that was previously hidden. Useful cleanup steps include:

• Use Close Holes only when a capped border is appropriate.
• Run Mesh Integrity > Check Mesh to identify geometry problems.
• Use Move Topological to adjust one separated piece without pulling nearby surfaces.
• Rename every new SubTool immediately to prevent confusion later.
• Use Gizmo 3D to verify that the new component moves independently as expected.

Subdivision levels require extra care. Some split workflows can remove or alter subdivision history, depending on the mesh and ZBrush version. Preserve the original, save an incremental project file, and confirm the result before continuing with detailed sculpting. If subdivision history is essential, consider duplicating the model and projecting details back onto cleanly separated geometry.

A strong production habit is to split by function rather than appearance. Keep objects separate when they need different materials, topology, deformation, export settings, or sculpting resolutions. This produces a more manageable file and reduces the chance of editing neighboring geometry accidentally.

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