Blender Select Ngons: The Fastest Way to Find Problematic Faces

Blender select ngons

Instantly highlight Ngons, triangles, and quads using vertex count filters

👉 Watch the step‑by‑step tutorial here (start at 40 seconds) — and learn how to clean up your mesh topology in under two minutes.

If you’ve ever dealt with shading glitches, subdivision surface artifacts, or unexpected deformation while animating, chances are your model contains Ngons (polygons with five or more sides). Knowing how to blender select ngons quickly is a superpower for any 3D artist. Fortunately, Blender has a built‑in, one‑click method to isolate Ngons, triangles, and quads — no add‑ons required.

Why Should You Care About Ngons?

Ngons and triangles can cause trouble in rendering, texturing, and animation. While triangles are sometimes acceptable (especially for game engines), Ngons are almost always problematic. By learning how to select Ngons in Blender, you can:

• Instantly spot bad geometry in complex meshes
• Improve subdivision surface behaviour
• Avoid shading errors and UV stretching
• Prepare models for animation, 3D printing, or export

The best part? The solution is already built into Blender’s Edit Mode.

Step‑by‑Step: How to Select Ngons, Triangles, and Quads

This technique uses Select > Select All by Trait > Faces by Sides. Here’s how to do it.

1. Create a Test Mesh (Optional but helpful)

Start with the default cube. Switch to Edit Mode (Tab). Use Ctrl + B (bevel) on a few edges to manually create a triangle and an Ngon. This gives you visual targets to practice on.

2. Deselect Everything

Press Alt + A (or Select > None) to clear the current selection.

3. Open the “Faces by Sides” Tool

Go to Select > Select All by Trait > Faces by Sides. A small numeric pop‑up will appear.

4. Choose Your Polygon Type

• Triangles: Set Number of Vertices to 3 and Type to Equal To.
• Quads: Set vertices to 4 (Equal To).
• Ngons: Set vertices to 5 and Type to Greater Than (this selects all faces with 5+ vertices).

Blender will instantly highlight every face matching your criteria.

5. Clean Up Your Mesh

Once your Ngons are selected, you can dissolve edges, use Face > Triangulate Faces, or manually retopologize the area.

Pro tip: This method works on any mesh — from organic sculpts to hard‑surface models. It’s the fastest way to audit your topology.

Key Insights from the Tutorial

The video tutorial (linked at the top) walks you through these exact steps in real time. Here are the most valuable takeaways:

• Vertex count filtering turns topology inspection into a single click. No more hunting for bad faces by eye.
• Bevel operations (Ctrl + B) are perfect for creating test Ngons — they help you practice selection without relying on external models.
• You can also select faces with exactly 5 or 6 edges by using “Equal To” and typing the specific vertex number. Great for advanced debugging.
• This selection method works on any Blender mesh (version 2.8 and above), including imported OBJ, FBX, or STL files.

Frequently Asked Questions

Q: What exactly is an Ngon? A: Any polygon with five or more edges (vertices). For example, a pentagon (5 edges) or hexagon (6 edges). Quads have 4, triangles have 3.

Q: Why are Ngons considered bad? A: They can break subdivision surface smoothing, cause pinched shading, make UV mapping difficult, and lead to unpredictable deformation during animation.

Q: Does Blender have an automatic “fix Ngons” button? A: Not directly. But once you blender select ngons using the method above, you can use Face > Triangulate Faces to break them into triangles, or manually edit edges to convert them to quads.

Q: Can I use this on a complex model with thousands of faces? A: Absolutely. The “Faces by Sides” tool works instantly, no matter how dense the mesh.

Q: Is this the same as “Select All by Trait > Non‑Manifold”? A: No. Non‑manifold geometry refers to edges without two faces. Ngons are a pure vertex‑count issue. Both are important for mesh cleanliness.

Conclusion & Next Steps

Learning to blender select ngons takes less than two minutes but saves hours of manual mesh cleanup. By using Blender’s built‑in Faces by Sides filter, you can instantly identify triangles, quads, and Ngons in any model — a fundamental skill for 3D artists at every level.

Now it’s your turn: open Blender, grab a mesh, and practice selecting faces by vertex count. For a visual walkthrough that makes everything crystal clear, watch the full tutorial here (starting at 40 seconds):

👉 How to Select Ngons, Triangles & Quads in Blender

After watching, apply the technique to one of your own projects. Clean topology leads to better renders, smoother animations, and far fewer headaches down the road.

Original post, https://www.blenderian.com/2026/06/blender-select-ngons.html