Unique texturing (texture painting)

Unique texturing means giving one asset its own texture set, laid out on non-overlapping UVs, and painting it specifically for that object. A crate, a gun or a hero statue gets maps that exist only for it, so every scratch and stain can sit exactly where its story says it should. The price is memory: Tim Simpson contrasts trim workflows with "massive 4k unique unwrap textures" that are still hard to afford on console (Polycount: TUTORIAL: Trim Textures for environment art…).

Most unique texturing today is texture painting: you paint on the 3D model in a dedicated tool, usually on top of baked mesh maps from a high-to-low bake.

#When to texture uniquely

• Hero props the player sees up close or inspects.
• Story objects where specific wear tells something (see environmental storytelling).
• Organic or irregular shapes that do not suit trim sheets or tileable materials.
• Small props whose textures can be packed into one atlas later.

Matthew Murchison uses the baked low-poly workflow where the camera rarely gets close enough to see texture pixels, and switches to bevelled geometry with tiling textures where it does (ArtStation blog: Leveraging Multiple Workflows). Unique textures sit best at mid distance and for hero props.

#The tools

See texturing and material software for licences and alternatives.

#How a painted texture is built

All of these tools work in layers that stack like Photoshop layers, but each layer carries several physically based rendering channels at once: base colour, roughness, metallic, normal and height.

#Masks

A mask limits where a layer shows. Adobe describes it this way: "The mask works as an intensity parameter over the content of the layer" (Substance 3D Painter documentation: Masking and effects). Masks are greyscale, and you can paint them by hand, fill them procedurally, or both.

#Generators

A generator is a procedural mask that reads the baked maps of your mesh. Adobe says generators suit masks in particular (Substance 3D Painter documentation: Masking and effects). The Metal Edge Wear generator, for example, "creates the appearance of damage and wear on areas of your mesh" that are likely to be knocked, and needs four baked maps: position, curvature, ambient occlusion and world-space normal (Substance 3D Painter documentation: Metal Edge Wear). A clean bake therefore matters, because errors in the curvature map put wear in the wrong places. See fixing baking artefacts.

#Materials and smart materials

In Painter, plain materials "are standard, uniform, tiling materials" and need no baking. Smart materials "are presets for a whole layer stack" that include mesh-specific detail, so you must bake first (Substance 3D Painter documentation: Create and use Materials and Smart Materials). Adobe calls them "advanced layer presets" whose results stay "adapted to the mesh topology"; smart masks are the same idea for masks only (Substance 3D Painter documentation: Smart Materials and Masks).

Smart materials are a starting point that needs further work. Applied unchanged, they make every prop look like every other prop that used the same preset.

#Anchor points

An anchor point lets one part of the stack read another. Adobe describes it as a way to "expose any resource or element in the layer stack and reference it in different areas of the layer stack" (Substance 3D Painter documentation: Anchor Point). A common use: paint dents or scratches into the height channel, add an anchor, and have a generator further up use that painted detail so wear and dirt follow it. The referenced anchor must sit below the layer that uses it, and references cannot cross texture sets (Substance 3D Painter documentation: Anchor Point).

#Storytelling wear

Procedural wear is quick to set up, but believable wear needs a cause. Ask who used the object, how, and for how long; then put damage where hands, feet, weather and time would put it. See environmental storytelling and sculpting damage and wear.

A practical order for any prop:

1. Base materials per part (wood, metal, paint), with correct values. See physically based rendering.
2. Large variation: colour and roughness shifts across big areas, so surfaces are not flat.
3. Form wear: generators for edges and cavities, then edited by hand.
4. Use wear: hand-painted masks where the story puts them (handles, kick plates, drips).
5. Final detail: labels, stencils, grime streaks. Check the value structure in greyscale.

#Exporting

Painter's output templates decide which maps are written, how they are named and how channels are packed. The default list includes templates such as "Unreal Engine (Packed)", "Unity Universal Render Pipeline (Metallic Standard)", "Unity HD Render Pipeline (Metallic Standard)" and "Blender (Principled BSDF)" (Substance 3D Painter documentation: Default Output templates). Adobe describes the Unreal template's purpose as packing textures "with the lowest possible memory footprint" (Substance 3D Painter documentation: Default Output templates). See channel packing and texture file formats.

Make your own template once per project so every artist exports the same names and packing.

#In different tools

• Substance 3D Painter: fill layers with masks, generators and anchor points; output templates for each engine (Substance 3D Painter documentation: Default Output templates).
• 3DCoat: paint and sculpt in one app; useful when you want to adjust the model while painting (3dcoat.com: 3DCoat).
• Mari: built for many UDIM tiles at very high resolution; more common in film than in games (foundry.com: Mari). See UDIMs.
• Blender: paint directly on the mesh in Texture Paint mode; the object must be UV unwrapped first, and overlapping UVs are not well supported (Blender Manual: Texture Painting: Introduction).

#Further reading and watching