ZBrush Tip: Mask-to-Polygroup Workflow for Rapid Segmentation

Core workflow

• Mask the region:
  • Hold Ctrl to paint a mask; Ctrl+Alt to subtract.
  • Ctrl+Click on empty canvas to invert the mask.
  • Ctrl+Drag on empty canvas to clear the mask.
  • Blur/Sharpen mask: Ctrl+Click once on the model to blur, Ctrl+Alt+Click to sharpen.
• Convert the mask to a Polygroup:
  • Tool > Polygroups > Group From Mask (or Group From Mask Clear to instantly clear the mask after grouping).
  • Shortcut: Ctrl+W assigns a new Polygroup to the masked area (or to all visible faces if no mask is present).
• Validate and manage:
  • Toggle PolyFrame (Shift+F) to visualize group boundaries.
  • Ctrl+Shift+Click a group to isolate it; Ctrl+Shift+Click canvas to show all.
  • Tool > Polygroups > Group Visible to consolidate visible faces into a single Polygroup.

Why it matters

• Selection speed: Instantly isolate complex regions without re-masking.
• Topology control: Use ZRemesher with Keep Groups to preserve panel borders and loops.
• Edge fidelity: Geometry > Crease > Crease PG adds creases along Polygroup borders for crisp subdivision.
• Paneling: Tool > Geometry > EdgeLoop > Panel Loops can generate clean, beveled panels from each Polygroup.
• UV strategy: UV Master can leverage Polygroups to create logical UV islands.

Pro tips

• Combine with visibility:
  • Hide what you don’t need (Ctrl+Shift selection), then use Group Visible for instant segmentation.
  • Split groups to separate SubTools: SubTool > Split > Split by Groups.
• Hard-surface flow:
  • Mask clean shapes with Lasso/Rect strokes and Polish by Features to refine boundaries before grouping.
  • After grouping, run ZRemesher with Keep Groups + low Smooth to maintain sharp edges.
• Organic workflows:
  • Block muscle groups or garment zones via masks, convert to Polygroups, and Extract or Panel Loop for layered builds.
  • Mask By PolyGroup (Brush > Auto Masking) to sculpt within a single region without spillover.
• Dynamesh awareness:
  • With Dynamesh, enable Groups to respect Polygroup borders as separate shells. Disable it to merge.

Troubleshooting

• Jagged borders: Blur mask once, then sharpen once for clean, predictable edges before grouping.
• Unexpected regrouping: Check visibility—Ctrl+W without a mask affects visible faces.
• Lost groups after remesh: Ensure ZRemesher > Keep Groups is on; increase Detect Edges for sharper preservation.
• Thin parts deforming: Use Backface Masking in Brush > Auto Masking while masking/painting borders.

Keep learning and outfitting your pipeline

• Explore ZBrush licenses, upgrades, and expert guidance from NOVEDGE: https://novedge.com/search?q=ZBrush.
• For broader Maxon ecosystem tools and bundles, visit NOVEDGE’s Maxon collection: https://novedge.com/collections/maxon.