Commands

ANALYSISOPTIONS command in AutoCAD : Sets the display options for zebra, curvature, and draft analysis

If you need to inspect surface continuity, draft angles, or curvature in AutoCAD, the ANALYSISOPTIONS settings control how those visual analyses are displayed. This guide explains what the command does, how to use it step‑by‑step, alternatives, common problems and fixes, practical tips, and a FAQ to answer common reader questions.

What is the ANALYSISOPTIONS command?

The ANALYSISOPTIONS command in AutoCAD configures display options for visual surface analyses such as Zebra, Curvature, and draft analysis. It does not itself perform an analysis; instead it sets parameters (color ramps, density, angle ranges, smoothing, etc.) that affect how the analysis results are rendered when you run the specific analysis tools.

Key points:

  • It affects visual quality and readability of analysis overlays.
  • It is mainly used with 3D surfaces and solids to evaluate continuity, curvature distribution and draft angles for manufacturing/mold design.
  • You usually access it from the command line or from the Visualize tab (Face Analysis/Visual Analysis panels).

How ANALYSISOPTIONS works — overview

When you run a surface analysis (for example Zebra to check continuity), AutoCAD overlays colors or stripes on faces. ANALYSISOPTIONS controls aspects such as:

  • Color ramps or stripe contrast
  • Density/resolution of stripes or sample points
  • Angle ranges used for draft analysis (what counts as acceptable draft)
  • Smoothing or interpolation between sample points
  • Whether to analyze by face normal, curvature magnitude, or principal curvature
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Setting these options appropriately helps reveal small continuity problems, high curvature zones, or insufficient draft for molding.

How to use ANALYSISOPTIONS — step by step

  1. Prepare your model

    • Make sure you have a 3D solid or surface in the drawing. Analysis tools operate on 3D geometry (surfaces/solids/regions), not on 2D polylines.
    • Turn on the layer(s) and make sure the objects are visible.

  2. Open Analysis Options

    • Type ANALYSISOPTIONS at the command prompt and press Enter.
    • Alternatively, go to the Visualize tab > Face Analysis (or Visual Analysis) and open the options from the panel menu or the small dialog launcher icon.

  3. Choose the analysis type tab

    • The dialog typically contains separate sections/tabs for Zebra, Curvature, and Draft analysis. Select the tab matching the analysis you plan to run.

  4. Adjust display parameters

    • For Zebra: set stripe density/width, contrast, and direction parameters (these make continuity gaps and tangent breaks clearer).
    • For Curvature: choose a color ramp, decide whether to visualize mean or Gaussian curvature or principal curvatures, and set cutoff values.
    • For Draft: set the reference direction (typically world Z or a custom direction), specify the angle range for acceptable/undesirable draft, and pick colors for the ranges.

  5. Apply and close

    • Click OK or Apply (depending on the dialog) to save settings.

  6. Run the actual analysis

    • Use the specific analysis tools:
      • Ribbon: Visualize tab > Face Analysis panel > choose Zebra, Curvature, or Draft.
      • Or type the analysis command (e.g., select the Face Analysis tool from the UI). Select the object(s) to analyze and view the updated overlay using your configured options.

  7. Interpret results

    • Use the color mapping or stripe flow to locate discontinuities, high curvature regions, or insufficient draft.
    • Adjust ANALYSISOPTIONS if you need higher resolution or a different color mapping to highlight issues.

Shortcut summary:

  • Command line: type ANALYSISOPTIONS to open options.
  • Visual tools: Visualize > Face Analysis to run analyses after setting options.

Practical examples (descriptive)

  • zebra analysis before/after:

    • Before: default low stripe density may hide subtle G1/G2 breaks between faces.
    • After increasing stripe density and contrast in ANALYSISOPTIONS, the stripe flow reveals a visible seam where continuity is broken.

  • Curvature analysis:

    • Use a curvature color ramp to quickly spot zones of high curvature (hot colors) versus flat areas (cool colors). Adjust sample density if results look noisy.

  • Draft analysis:

    • Set the reference direction (mold pull direction) and acceptable angle range (for example 0°–2° as acceptable). The overlay shows faces in green (good), yellow (marginal), red (fail), depending on your chosen colors.
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Alternative ways to run face analyses

  • Use the Visualize tab > Face Analysis panel: quick access buttons for Zebra, Curvature, and Draft analysis.
  • Right‑click contextual menus on 3D faces (in some workspaces) to access face analysis quickly.
  • Use the Properties palette for face-level properties combined with analyses to diagnose specific faces.
  • For advanced curvature maps, export geometry to a dedicated surfacing package (Rhino, Fusion, SolidWorks), run analysis there, then return to AutoCAD if needed.

Why ANALYSISOPTIONS (or analysis tools) sometimes don’t work — causes and fixes

  1. Problem: No 3D geometry selected / object type unsupported

    • Fix: Ensure you select 3D solids or surfaces. 2D objects will not display face analysis results.

  2. Problem: Analysis colors/stripes not visible

    • Fixes:
      • Switch to a visual style that supports face analysis (try “Shaded” or “Realistic” or the Face Analysis workflow).
      • Make sure the object’s layer is on, thawed, and unlocked.
      • Turn on Hardware Acceleration or update GPU drivers if the overlay fails to render.

  3. Problem: Analysis is too coarse or noisy

    • Fix: Increase sampling density or stripe resolution in ANALYSISOPTIONS. Use REGEN or REGENALL after changes.

  4. Problem: Analysis appears incorrect relative to expected direction (e.g., draft direction wrong)

    • Fix: Set the correct reference direction (UCS or world direction) before running draft analysis. You can rotate UCS or specify a custom pull direction in the analysis dialog.

  5. Problem: Performance slowdown with large/complex models

    • Fixes:
      • Reduce sample density or temporarily analyze only selected faces.
      • Isolate the part of the model to analyze (use ISOLATE or HIDE commands).
      • Use lower visual fidelity while adjusting, then increase for final inspection.

  6. Problem: Options dialog won’t open or command seems ignored

    • Fix:
      • Ensure command spelled correctly (ANALYSISOPTIONS).
      • Restart AutoCAD if UI becomes unresponsive.
      • Reset AutoCAD profile to default if a corrupted profile is suspected.
      • Update AutoCAD to the latest service pack.
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Tips and best practices

  • Always set the pull/reference direction correctly for draft analysis—this is crucial for mold and tooling checks.
  • Start with moderate sampling density; increase only when you need more detail to avoid heavy computation.
  • Use high-contrast colors for printouts or presentations so analysis overlays remain readable.
  • Temporarily isolate complex geometry to reduce visual clutter when diagnosing a specific area.
  • Combine analysis with other checks (normals direction, adjacency, surface trim boundaries) to better locate modeling errors.
  • Save commonly used analysis settings as part of a template or profile for consistent results across projects.

FAQ

What types of objects can be analyzed with ANALYSISOPTIONS and face analysis tools?

Face analysis works on 3D surfaces and solids (including regions and faces). It does not run on simple 2D polylines or text. Ensure the object you select has faces to evaluate.

Why do the stripes or colors disappear when I change visual styles?

Some visual styles or render modes do not display face analysis overlays. Switch to a shaded or face‑analysis compatible visual style (use the Visualize tab > Visual Styles) and enable Hardware Acceleration if needed.

Can I print or export the analysis overlay?

Yes — if the analysis overlay is visible in your drawing, you can print or export to PDF/plot normally. For higher-quality visuals, use a shaded visual style with the analysis overlay and increase sampling density beforehand.

How do I check draft for a specific molding direction?

Set the correct reference/pull direction before running draft analysis. You can align the UCS to the mold pull direction or specify a custom direction in the Draft analysis options.

My analysis is slow on large models — how can I speed it up?

Analyze only selected faces or isolate the part you need, reduce sampling density in ANALYSISOPTIONS, or temporarily hide other complex assemblies. Also ensure your GPU drivers are up to date.

How do I restore default analysis options?

Open ANALYSISOPTIONS and look for a Reset or default button in the dialog. If unavailable, reset your AutoCAD profile to defaults (Profile Manager) to restore default analysis settings.

Are the analysis settings saved with the drawing or the AutoCAD profile?

Most analysis display settings are saved in the AutoCAD profile, not per drawing. To reuse specific settings across projects, save them in your default profile or export your profile and import on other machines.

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