Modeling · Intermediate

Triangulation

Splitting every face of a mesh into triangles, usually before export

Also called Triangulate

What is triangulation in 3D?

Triangulation is splitting every face of a mesh into triangles, the shape graphics cards draw directly. Game engines and many file formats triangulate models automatically. Doing it yourself before export lets you choose how each face is split, so shading looks the same in every app.

Think of it like this

It is like cutting square sandwiches into triangles: nothing is added or removed, but you decide which way the knife goes.

Where it fits in a 3D project

  1. Create
  2. Surface
  3. Rig
  4. Animate
  5. Render
  6. Export

Export: Saving and sharing the result: file formats, engines and printing.

How triangulation works

  1. 01The software looks at each face with four or more sides.
  2. 02It draws new edges across the face, corner to corner.
  3. 03Each face becomes two or more triangles covering the same area.
  4. 04The shape stays the same, while the face count goes up.

Triangulation vs tessellation

PropertyTriangulationTessellation
What it doesSplits existing faces into trianglesFills a surface with many smaller faces
ShapeStays exactly the sameCan get smoother or more detailed
Face countRises a littleCan rise a lot
Typical usePreparing a model for exportTurning curved surfaces into a detailed mesh

Triangulate to lock in how a finished model is split; tessellate when a surface needs more faces to show its curve or detail.

Where triangulation is used

Beginner tip

Keep a quad copy of your model. Triangulate only the export version, or use a triangulate modifier you can switch off, so the clean version stays easy to edit.

Terms related to triangulation

Triangulation FAQ

Should I triangulate before exporting?
Often, yes, for game assets with baked normal maps. Engines triangulate anyway, but they may split faces differently from your baking app, which causes shading errors. Triangulating first makes every app use the same split.
Why do game engines use triangles?
A triangle is always flat, because any three points lie on one plane. That makes triangles fast and predictable for graphics cards to fill, so engines convert every face into them.
How do I triangulate a mesh in Blender?
In Edit Mode, select the faces and press Ctrl+T, or add a Triangulate modifier to keep it reversible. The modifier also lets you pick how quads and n-gons are split.

Updated October 29, 2026 · Browse all 3D terms