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The Roblox triangle limit: 20,000 per mesh, and how to get under it
Roblox's mesh triangle limit is 20,000 (4,000 for rigid accessories). What the "too many triangles" error means and how to get under it without losing shape.
3 min read
Quick answer
How many triangles can a Roblox mesh have?
Up to 20,000 per mesh, per Roblox's mesh specifications. Avatar items are stricter: rigid accessories such as hats are capped at 4,000. Studio's Assistant generates meshes at up to 10,000 by default. Most props should sit far lower, often a few hundred to a few thousand, because every triangle costs performance on phones.
The numbers that apply to you
You'll see 10,000, 20,000 and 21,000 quoted around the web, and some tool sites still quote the old figures. Roblox's own documentation is the source to trust:
- 20,000 triangles per mesh, the hard limit for any imported mesh (general specifications).
- 4,000 triangles for a rigid accessory, such as a hat, back item or shoulder piece (accessory specifications). Character bodies and layered clothing have their own budgets.
- 10,000 triangles is the default maximum for meshes generated by Studio's Assistant. You can set it lower (Assistant guide).
The limit is per mesh. A file with three objects of 15,000 triangles each imports fine as three MeshParts, but it costs 45,000 triangles to render.
What "too many triangles" really means
The Importer flags any mesh over the limit, and Roblox's validation errors page puts the fix plainly: "retopologize your model to reduce the triangle count". It's rarely a sign you need more allowance. A mug, a crate or a chair doesn't need thousands of triangles.
How to get under it
Retopologise
Retopology rebuilds the surface with fewer, evenly placed polygons that follow the form. Done well, the silhouette survives and the UVs stay clean. It is the right fix for scans and raw AI output, which are often far denser than they need to be. See why AI 3D models have messy topology.
Decimate
Blender's Decimate modifier, or Mesh ⟩ Clean Up ⟩ Decimate Geometry, removes triangles algorithmically. It's fast and fine for organic shapes like rocks, but it can leave lumpy surfaces and break UVs on hard-surface models. Check the result from every angle.
Bake the detail into a normal map
Keep the detail as lighting information, not geometry. Bake the high-poly version's surface into a normal map on the low-poly mesh. Roblox expects OpenGL-style tangent-space normal maps.
Split, only as a last resort
Separating a model into several meshes works around the per-mesh cap, but each extra mesh adds draw and memory cost. Do it for big structures that are genuinely separate pieces, not to dodge optimisation.
How low should you go?
There's no official number per prop, but think about screen size. Something players see from a distance needs very little. Something they hold or walk up to deserves more. Roblox's RenderFidelity simplifies distant meshes automatically, but a lighter mesh to start with is always cheaper. Low-poly models for Roblox and optimise Roblox meshes go further.
Skip the clean-up step
Most "too many triangles" errors on AI models happen because the generator's raw output was never reduced. Vi3W retopologises automatically from high to low poly before you download, and you can check the result in the browser before exporting GLB, FBX or OBJ. Check the count in Blender or the Importer preview before you upload. Generate a low-poly model in Vi3W.
Frequently asked questions
How can I fix the ''Your mesh has to many triangles'' error?
Reduce the triangle count below 20,000 before importing. In Blender, turn on Overlays ⟩ Statistics to see the count. Then either retopologise, which rebuilds the surface with fewer clean polygons and keeps the shape, or add a Decimate modifier, which is quicker but can leave lumps and break UVs. Splitting the model into several meshes works too, but every extra mesh adds rendering cost, so treat it as a last resort.
Yellow triangle saying 20000
That warning means one of the meshes in your file is over Roblox's 20,000-triangle limit. Check each object's count separately, because the limit applies per mesh, not per file. Then reduce or split the one that's over. If the source is a scan or a raw AI model, retopology plus a baked normal map keeps the look at a fraction of the triangles.
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