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AutoCAD SPLANE Shortcut : SECTIONPLANE : Creates a section object that acts as a cutting plane through 3D objects

If you need a clear, step-by-step guide to using the AutoCAD sectionplane tool (alias SPLANE) to create cutting planes through 3D objects, this article explains what the command does, how to use it, common reasons it fails and how to fix them, plus alternative commands and practical tips to get reliable results.

What is the sectionplane (SECTIONPLANE / SPLANE)?

The AutoCAD SECTIONPLANE command (often available via the alias SPLANE) creates a section object that behaves like a cutting plane through 3D solids, surfaces and meshes. The Section plane itself is a dynamic object you can move, rotate and flip. From that plane you can then generate 2D section geometry, create section views or clip a model visually to inspect internal details.

Key points:

  • SECTIONPLANE produces a dynamic section plane — not an immediate 2D drawing.
  • You can adjust its position/orientation using grips or properties.
  • You can generate actual section curves/regions from a section plane for documentation or detailing.

When to use a section plane

Use SECTIONPLANE when you want to:

  • Inspect the interior of a 3D model quickly (visual clipping).
  • Create a precise 2D section/profile from a 3D solid or assembly.
  • Prepare section geometry to annotate or export to layout sheets.
  • Create multiple sectional cuts and toggle them on/off without modifying model geometry.

How to use SECTIONPLANE — Step by step

(You can type either SECTIONPLANE or the alias SPLANE at the command line.)

  1. Start the command:

    • Type SECTIONPLANE or SPLANE → Enter.

  2. Choose placement method:

    • Click in the model to place a default plane.
    • Or use available options (typical choices): 3 Points, Object, Orthographic, or align to the current UCS. (Exact option wording can vary by AutoCAD version — use the command line prompts.)

  3. Position and orient the plane:

    • Use the grips (arrows and rotation handles) to move, rotate or flip the plane.
    • You can also set the plane orientation numerically in the Properties palette (enter specific angles or align to a face or UCS).

  4. Visual inspection (optional):

    • With the section plane selected, choose Show section or turn on section display in the ribbon/contextual menu to visually clip the model and see the cut.

  5. Generate 2D section geometry:

    • Right-click the section plane and choose Create Section / Generate Section (or use the SECTION command depending on your version).
    • Follow prompts to define output options (region, polyline, name, insertion plane).
    • The command usually produces polylines or regions representing the intersection between the plane and the 3D solids.

  6. Place the generated section in a drawing or layout:

    • Move the generated geometry to a layout or scale into a view.
    • Add dimensions, labels and hatching as needed.

  7. Save and manage:

    • Section planes are objects in your drawing and can be moved, renamed, or deleted without altering the original solids.
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Notes:

  • The exact UI items (context menus, ribbon buttons, command options) can differ between AutoCAD versions or workspace customizations. Watch the command line prompts and the contextual ribbon for steps.

Practical examples

  • Create a vertical section through a building model: place plane perpendicular to building axis → flip to expose interior → generate 2D section → annotate.
  • Create several parallel sections through a mechanical assembly: duplicate section planes along an axis → generate section profiles for each slice.
  • Use a section plane temporarily to inspect hidden geometry without modifying solids (no boolean operations required).

Alternatives to SECTIONPLANE

If SECTIONPLANE doesn’t suit your workflow, consider these commands:

  • SLICE — Splits a solid by a plane; produces new separate solids (destructive if you keep only part). Good when you want to actually modify solids.
  • SECTION — In some versions, creates a 2D section directly from solids. Useful for a simpler 2D output workflow.
  • FLATSHOT — Converts visible 3D geometry (after clipping or orientation) into 2D projection/drawing. Use after visually clipping with a section plane or view orientation.
  • XCLIP / CLIP — Clips block or xref display to show internal areas (not true cutting).
  • Boolean operations (SUBTRACT / INTERSECT) — For permanent geometry cuts, not just visual sections.
  • Third‑party or industry-specific tools (AutoCAD Architecture / Revit / Inventor) — offer automated section views and documentation for building/mechanical workflows.

Common problems and fixes (Why SECTIONPLANE may not work)

Problem: Command not found or nothing happens when you type SECTIONPLANE.

  • Fix: Make sure you are running a version of AutoCAD with 3D tools enabled. Switch to a 3D modeling workspace or load the appropriate Tool Palettes. Try the alias SPLANE.
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Problem: The section plane appears but does not cut or generate geometry.

  • Fixes:
    • Ensure you have 3D solids, surfaces, or meshes in the area of the plane. Section planes don’t create intersections with 2D polylines.
    • Verify objects are not on frozen or locked layers.
    • Set a suitable visual style (e.g., Realistic, Conceptual, or 3D Hidden) to preview clipping.
    • Use REGEN or REGENALL if display glitches occur.

Problem: Generated section is missing parts or has gaps.

  • Fixes:
    • Check that solids are truly closed 3D solids; open surfaces may produce incomplete intersections.
    • Ensure tolerance and unit settings are appropriate; very small edges may be lost.
    • Try increasing model precision or use Boolean repair tools.

Problem: Section plane is invisible or hard to select.

  • Fixes:
    • Turn on the section plane layer or check layer visibility.
    • Use the Properties palette to locate the plane (search by type or name).
    • Zoom extents or use selection cycling (Ctrl+W) to pick overlapping objects.

Problem: Section plane doesn’t affect Xrefs or blocks.

  • Fixes:
    • SECTIONPLANE typically acts on objects in the current drawing; for xrefs you may need to open the xref drawing or bind it. Use XCLIP for clipped display of xrefs.

Problem: Generated section is not in the orientation or scale expected.

  • Fixes:
    • Align the UCS before generating the section if you want the output aligned to a specific plane.
    • Use the Create Section options to control output plane and orientation.

Tips and best practices

  • Use the 3D Modeling workspace for easier access to grips, UCS controls and section plane ribbon tools.
  • Name your section planes in the Properties palette for easy management when your drawing has multiple cuts.
  • Keep section planes on a dedicated layer so you can toggle their visibility quickly.
  • When generating 2D sections for documentation, create them on separate layers (e.g., A-SECT-PLN, A-SECT-HATCH) and lock the original model layer.
  • For repeated, parallel sections, copy the section plane object and translate it rather than creating new ones from scratch.
  • If you need a printable section view, generate the section geometry, then use HATCH and DIMSTYLE to produce consistent annotations.
  • Consider exporting section curves to another program (e.g., Illustrator or CAD detailing software) if you need advanced graphics.
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FAQ

What is the difference between SECTIONPLANE and SLICE?

SECTIONPLANE creates a dynamic cutting plane and generates 2D section geometry on demand; it is primarily for visualization and documentation. SLICE actively splits a solid into separate solids (destructive if you discard a portion). Use SECTIONPLANE for non-destructive inspection, SLICE to permanently cut solids.

Can I automatically create dimensioned section views like in Revit?

AutoCAD’s SECTIONPLANE does not create parametric, automated section-views like Revit. You must generate section geometry, place it in a layout, and manually add dimensions and annotations or use third‑party extensions for automated views.

Can I convert a section plane directly to a hatch or filled region?

Yes — after you generate the section geometry as closed polylines or regions, you can apply HATCH to those regions. If the output is open, you may need to close gaps or use REGION to convert polylines to regions first.

Why can’t I select certain solids when creating a section?

Common causes: the solid is on a frozen or locked layer, it’s an External reference (xref) that must be opened/bound, or the object is not a true 3D solid (e.g., 2D polyline or proxy object). Verify object type and layer visibility.

Will section planes print?

Section planes themselves are display objects and typically are not meant to be printed. Print the generated 2D section geometry (polylines/regions) or create layout views. Put printable geometry on printable layers.

How do I save multiple section views for later use?

Keep each section as a named section plane object and generate section geometry as separate blocks or named regions. Use layers and naming conventions so each section is easy to locate and reuse.

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