ZBrush Tip: Hard-surface blocking with ZBrush Clip brushes

Today’s tip focuses on using the Clip brushes to create fast, crisp, hard edges in ZBrush while keeping your sculpting flow efficient and intentional.

Why use Clip brushes:

• They instantly flatten geometry to a plane or shape, perfect for hard-surface blocking and clean bevel foundations.
• They preserve polygon count (they project points instead of deleting), which makes them great for quick shape refinement.
• They’re predictable when used from orthographic, aligned views for industrial or mechanical details.

Core tools to know:

• ClipCurve: Draws a cutting curve to push geometry to a plane.
• ClipRect, ClipCircle: Constrain to rectangular or circular planes for rapid, clean trims.
• ClipLasso: Freeform boundary for more organic hard-surface decisions.

How to use them effectively:

• Access: Hold Ctrl+Shift and select ClipCurve/ClipRect/ClipCircle/ClipLasso from the selection brushes.
• Direction: While drawing the stroke, note the shaded/gradient side—this is the direction the surface will be pushed. Flip direction before releasing if needed.
• Corners and curves: Tap Alt as you draw ClipCurve to insert a sharp corner or change the curve’s tension, allowing stepped or faceted planes.
• Precision: Work in orthographic view and snap the camera (hold Shift while orbiting) to align clips to world axes for truly planar results.
• Scope control: Hide geometry (Ctrl+Shift to hide/show) you don’t want affected; Clip pushes all visible polygons along the clip plane.

Clean-up and refinement:

• If you see pinching or folded surfaces (a natural result of projection), run Deformation > Polish or Polish by Features to unify planes without erasing crisp edges.
• Need production-ready topology? ZRemesher with KeepGroups, then Crease PG and apply Dynamic Subdivision to preview hold lines.
• For watertight cuts, prefer Trim brushes; Clip preserves topology count and can compress faces internally—great for blockout, less ideal for final boolean-like results.

Recommended workflow:

• Duplicate your SubTool before aggressive clipping for easy A/B comparisons.
• Polygroup strategically (Auto Groups by Normals) so you can isolate and polish by features right after clipping.
• Clip to establish planes, then add controlled bevels with Group Loops or ZModeler for design-grade edges.
• Project details back if needed: after cleanup or retopo, use Project All to recover high-frequency information.

Troubleshooting tips:

• Jagged edges after clip: temporarily increase mesh density (Dynamesh resolution up or quick subdivide) before clipping, then refine.
• Unwanted back-side deformation: hide the back faces or split into parts, then Clip on isolated pieces.
• Uneven planes: clip from a locked orthographic camera and follow with a light Polish by Features pass.

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