Do AI-generated models work with Nanite?

What Nanite does

Nanite is Unreal Engine 5's virtualised geometry system. Instead of drawing every triangle of a mesh every frame, it streams and renders only the detail that's visible at the current screen resolution, building clusters of triangles at different levels of detail automatically. In practice that means meshes with very high triangle counts can be placed in a scene without the usual cost, and without hand-made LOD chains.

That's interesting for AI-generated models, because generators often produce dense geometry.

Why it suits generated props

• Dense meshes are fine. A generated statue or rock with a high triangle count doesn't need to be reduced to a strict budget for Nanite to render it.
• No manual LODs. Nanite handles detail scaling itself.
• Detail stays in the mesh, rather than being baked to normal maps.

What Nanite doesn't fix

• UVs and textures. Nanite renders geometry; your textures still need sensible UVs and appropriately sized maps. Texture memory is a separate budget.
• Collision. Physics doesn't use the Nanite mesh. You still need simple collision. See adding collision.
• File size and memory. Dense meshes still take disk space and memory (Nanite compresses well, but not to nothing).
• Editing. A dense, triangulated mesh is still hard to edit. If you'll modify it, clean topology helps.
• Every case. Nanite has had limits on which mesh and material types it supports, such as skeletal meshes, some translucent materials and certain deformation, and Epic has expanded support across 5.x releases. Check Epic's Nanite documentation for your engine version.

Enabling Nanite

• On import: tick Build Nanite (or the equivalent Nanite option) in the import dialog.
• After import: open the mesh in the Static Mesh Editor and enable Nanite Support in the details, then apply.
• In bulk: select several meshes in the Content Browser and use the right-click menu's Nanite option.

Use the Nanite visualisation modes in the viewport to confirm which meshes are Nanite.

Do you still need retopology?

For static props in a Nanite-enabled project, often not for rendering's sake. You'd still consider it when:

• You're targeting platforms or render paths where Nanite isn't available.
• The asset will animate or deform.
• You need clean UVs for hand-painted textures.
• You'll edit the mesh by hand later.
• File size matters (downloads, mobile).

Vi3W retopologises every model automatically, so its output is lighter than a raw dense generation anyway. Nanite can still help with very detailed pieces, and the combination gives you clean geometry that renders well at any distance. Retopology and level of detail cover the traditional approach.

A practical policy

• Dense, static, opaque props (rocks, statues, architecture details): Nanite on.
• Characters and anything skinned: traditional mesh with LODs (check your engine version's Nanite support).
• Glass and transparent props: traditional mesh, check Nanite's material support.
• Small, simple props: either way; Nanite has less to gain.

Building a UE5 level? Generate the detailed props in Vi3W, import them with Nanite on, and give each one simple collision.