Skip to main content

Extrude Region

BEGINNER
📖2 min read
Extrude Region
1 / 2

Introduction​

Extrusion is the primary method for adding volume to a mesh. It takes a selection (vertices, edges, or faces) and extends it in a specific direction, creating new connecting geometry (sides) in the process.

Resources

Access guides on extrusion types and manifold geometry.

Links

Explore Blender's Extrude tools documentation.

Videos

Watch tutorials on creating volume and form.

Basic Usage​

  1. Select: Choose the geometry you want to extend.
  2. Extrude: Press E.
  3. Move: Move your mouse to define the distance. The movement is usually locked to the normal (direction) of the selection.
  4. Confirm: Left-click to confirm.

Extrusion Modes (Alt + E)​

Pressing Alt + E opens the Extrude Menu, offering specialized modes:

  • Extrude Faces Along Normals: Extrudes multiple faces outward in their own individual directions (useful for spikes or expanding a sphere).
  • Extrude Individual Faces: Extrudes each selected face separately, without connecting their sides to neighbors.
  • Extrude Manifold: A "smart" extrude that automatically dissolves overlapping geometry. It acts like a "Push/Pull" tool, allowing you to extrude inwards to create holes or cutaways cleanly.

Common Pitfall: The "Zero Area" Face​

If you press E to extrude and then Right-Click to cancel the movement, the extrusion still happened. You now have duplicate vertices sitting directly on top of the originals.

  • Fix: Press Ctrl + Z immediately, or select all (A) and press M > By Distance to merge duplicates.

Summary​

Extrusion is the bread and butter of modeling.

Key Takeaways:

  • Shortcut: E for basic, Alt + E for menu.
  • Direction: Usually follows the "Normal" (perpendicular direction) of the face.
  • Manifold: Use "Extrude Manifold" for boolean-like push/pull operations.

Documentation for Methodology​

What to document when Extruding

In Your Method Section​

Describe how the basic form was blocked out. Did you extrude from a 2D plan (floor plan) or from a primitive shape?

In Your Decision Log​

Record the following when using this technique:

  • Source of extrusion (e.g., "Extruded from the floor plan curve")
  • Height/Distance (if precise measurements were used)
  • Use of "Extrude Manifold" for complex cuts.

Verification​

Check for "doubles" (overlapping vertices) if you cancelled any extrusion operations. Ensure normals are facing the correct direction (Shift+N) after complex extrusions.

Example Methodology Statement​

"The walls were created by extruding the 2D floor plan curve upwards by 3 meters. Window openings were formed using the Extrude Manifold tool to push geometry inwards."