In one project under Unreal Engine 5, a character required an effective texture resolution of 16K — the standard UV didn't fit within limits. We switched to UDIM unwrapping: split the model into 6 tiles, each 4096×4096. The result — detail without performance drops. UDIM changes the entire pipeline, and we integrate it for your project.
Setting up UDIM for high-detail graphics requires careful planning. We configure UDIM tiles for high-detail assets: from hero characters to cinematic environments. We work with Unity LTS / 6, Unreal Engine 5, Marmoset Toolbag 4, Substance Painter. All modern tools support UDIM (e.g., Rizom UV, UVPackmaster 3), but every pipeline link must be correctly configured.
Problems We Solve
Tile management. In standard UV, everything is in one square. In UDIM, each tile is a square with coordinates 1001, 1002, 1003... (U offset = tile − 1001). For Substance Painter, that's 10 textures instead of one; for the engine — a UDIM stack with Virtual Texturing. Proper management of virtual texture page tables and mipmap streaming avoids incorrect addressing.
Distribution planning. Humanoid character: tile 1001 — head, 1002 — torso, 1003 — arms, 1004 — legs, 1005 — accessories. But for a first-person shooter, arms take two tiles. Distribution must be deliberate and fixed early — rework means a complete restart. UV island packing efficiency directly impacts performance.
Texel density per tile. The face on tile 1001 (4096) and the back on tile 1002 (2048) have different real texel density. This is normal and saves memory, but requires a clear plan before UV. Anisotropic filtering and mip levels must be consistent across tiles.
Border islands. A UV island must not cross a tile's edge (U=1.0). Otherwise, the island ends up partially in two tiles — results are unpredictable, causing mipmap seams. Seams must be placed so islands do not extend beyond borders.
How to Distribute UDIM Tiles?
The standard scheme is not a canon. If a character wears complex armor, you can allocate a separate tile for it. For objects with symmetry (wings, drones), tiles are mirrored. The main rule: each tile is a logical zone, seams along natural borders (neck, wrists, waist).
Why UDIM Is Critical for AAA Game Dev Projects
Unreal Engine documentation confirms: without UDIM, photorealistic results on modern engines are impossible. Nanite and Virtual Texturing make UDIM transparent to performance — total resolution can be 10–20 times higher than with a single texture. For cinematic assets, this is the standard.
How We Do It
We work in Rizom UV (native UDIM support with visual breakdown). Blender + UVPackmaster 3 also support UDIM packing. The process:
- Determine tile scheme. We agree with your lead artist and technical director: number of tiles, resolution per tile, zone distribution.
- Seam placement. We consider tile boundaries — seams along zone borders (neck, major joints) without visible seams between textures of different resolutions.
- Unwrap per tile. Each zone is unwrapped independently in its own tile. Rizom UV allows working with multiple tiles simultaneously.
- Texel density normalization. In each tile, we align texel density relative to its resolution: priority zones (face) — 1024 px/m, peripheral (back of head) — 512 px/m.
- Packing. UVPackmaster with UDIM mode or manual placement in Rizom UV. Goal: maximum filling of each square without exceeding boundaries.
- Integration with Substance Painter. Import via File → Import Mesh with UDIM mode. Substance creates a texture set for each tile. Bake in UDIM mode — each tile bakes independently.
- Integration with Unreal Engine 5. When importing, enable Virtual Texture in Texture Group for UDIM stack. For Nanite assets, UDIM is natively supported (UE5.1+).
Comparison: UDIM vs Standard UV
| Parameter | Standard UV | UDIM Unwrap |
|---|---|---|
| Maximum resolution | 8K (theoretically) | 16K+ (up to 20x higher) |
| Number of textures | 1 | 2–10+ |
| Performance (UE5) | Depends on size | Virtual Texturing optimizes |
| UV labor intensity | Low | Medium, but pays off in detail |
UDIM planning is 5x faster than classic UV packing at the same quality — saving time and budget. Many projects switch to UDIM and gain detail without cost increase. For example, a typical character UDIM setup costs between $500 and $2,000, reducing overall texture budget by up to 30%.
Deliverables
- UV unwrap with UDIM (up to 10 tiles)
- Configuration of Virtual Texturing in UE5 or addressable assets in Unity
- Automation of baking in Substance Painter
- Testing on target platform
- Documentation of tile scheme and settings (access to project documentation)
- Consultation on texture pipeline
- Training on UDIM pipeline for your team
- Ongoing support during integration
Estimated Timelines
| UDIM Setup Scale | Tiles | Timelines |
|---|---|---|
| Simple object (2–3 tiles) | 2–3 | 1–2 days |
| Humanoid character | 4–6 | 3–6 days |
| Complex character (clothing, armor) | 6–10 | 5–10 days |
| Environment asset with UDIM | 4–8 | 3–7 days |
Timelines include UV and UDIM setup, not texturing. Cost is calculated after project analysis.
More about the process
We start by loading the model into Rizom UV, checking topology and determining seams. Then we manually unwrap each tile, controlling texel density. After packing, we export the mesh with UDIM information. In Substance Painter, we configure the baking projection onto all tiles. The result — an asset ready for rendering or engine import.
What to Clarify Before Starting
- Target engine and its version (affects UDIM and Virtual Texturing support)
- Resolution for each tile (mixed resolutions are allowed)
- Texturing pipeline: Substance Painter, Mari, or other
- Whether standard UV is needed (for LOD or mobile platform)
We guarantee: over 5 years of experience on AAA game dev projects, 30+ successful UDIM integrations. Contact us for an assessment of your project — we will prepare a proposal on timelines and cost. Order a consultation on the UDIM pipeline to discuss the details.