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TrimDynamic is a fast, reliable way to carve clean, planar facets and break noisy forms into readable hard-surface volumes. Use it early for concept blocking and again during refinement to introduce purposeful bevels and highlights.
- When to choose TrimDynamic
- Concepting hard-surface: squash bumps into crisp planes quickly.
- Stylization: introduce deliberate faceting without over-polishing.
- Prep for panel cuts: establish flat grounds before Slice/Panel Loops.
- Use HPolish later when you need tighter plane continuity and straighter borders.
- Core setup (repeatable recipe)
- Select Brush > TrimDynamic (quick find: press B, then start typing “trim”).
- Focal Shift: -100 for a square, decisive contact patch.
- Z Intensity: 20–40 for confident planarization; 5–15 for subtle nudges.
- Brush > AutoMasking > BackfaceMasking: On (essential on thin shells).
- Brush > Auto Smooth: 8–20 to reduce chatter as you plane.
- Stroke > LazyMouse: On (L), LazyRadius: 20–40, LazySmooth: ~8 for stability.
- Brush > Depth > Imbed: 0 to -5 to control how aggressively you “bite” into the surface.
- Alpha: Off (default) for a neutral, predictable footprint; try a square alpha for harder edges.
- Practical workflow
- Block volume with Dynamesh or Sculptris Pro at a density that prevents lumpy planes.
- TrimDynamic from stable camera angles; keep passes long and confident.
- Protect borders: Mask by Cavity before planing to retain crisp panel edges.
- Unify facets: Deformation > Polish by Features (low values 1–3) after trimming.
- Refine: Switch to HPolish for late-stage straightening and tight bevel reads.
- Topology pass: ZRemesher once the planes read well, then Project All to retain form.
- Control and consistency tips
- Maintain a plane: work from the same camera view when revisiting a face.
- Invert behavior with Alt to push vs. shave; use it to “build out” a plane before equalizing.
- Edge safety: enable BackfaceMasking and reduce Imbed near thin lips or vents.
- Noisy surfaces: raise mesh resolution or subdivide once before trimming.
- Troubleshooting
- Chatter or stepping: increase LazySmooth, lower Z Intensity, or slightly increase Auto Smooth.
- Dents punching through: BackfaceMasking On; reduce Imbed; approach at a shallower angle.
- Loss of definition after polish: use lower Polish by Features and re-pass with TrimDynamic.
- Speed and repeatability
- Assign a hotkey to TrimDynamic and save the brush preset (Brush > Save As) for your studio defaults.
- Pair with SliceCurve or ZModeler creasing after planes are set for production-ready edges.
- Finish with subtle Pinch along plane intersections to sharpen the light break.
Pro tip: Treat TrimDynamic as “intent made visible.” Every pass should clarify silhouette and light. If a stroke doesn’t improve read from 3–5 meters, undo and re-aim.
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