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Mesh

Main Mesh

This is a 3D model of the building, which will be visible when the camera is close to it. The actual mesh file contains vertices (their coordinates, UV mapping, normals, and colors) and triangles.

It's created using 3D modeling software such as Blender, 3ds Max, Maya or SketchUp.

Model Complexity

It's recommended to stay within reasonable triangle counts based on the size and detail of your model. You may look at examples of vanilla buildings or assets by other creators for reference.

The absolute limit for a mesh is 65536 vertices.

You can use Mesh Info by SamsamTS to check triangle counts of assets.

LOD Mesh

Comparison between main and LOD meshes for a large and small building.

LOD stands for level of detail. This is the mesh visible from a distance. It must be as simple as possible.

If you don't provide an LOD mesh, the game will try to generate one automatically, which may have visual issues, so it's highly recommended to make a custom LOD using baking.

UV Mapping

Example UV mapping using visible horizontal tiling on the bottom.

For the main mesh, you are allowed to UV map outside the 0-1 area (main tile), so you can tile the entire texture multiple times on a single face.

LOD

UV mapping for LOD mesh using automatic mapping in 3ds Max. No overlap and contained within the main tile - good for baking.

For the LOD mesh, the UV mapping must be within the 0-1 area (main tile) of the UV map, no tiling is allowed. This is because ingame all the LOD textures are combined into a single texture called an atlas, so having incorrect uv mapping will end up putting the texture of some other random building on your LOD.

Pivot / Origin

The pivot point or origin represents the center point on the ground of the lot. It's usually represented using a red/green/blue axis gizmo.

Transform

Make sure you are exporting a single object, which doesn't have any rotation or scale.
This can be done using 'apply rotation & scale' in Blender, or 'reset xform' in 3ds Max, and exporting only the selected object.

Vertex Paint

The vertex color blue channel determines snow behavior on winter maps:

128 means 3D snow will not be generated
0 means no snow will be visible at all

Formats

FBX (2015 or older) (most commonly used)
OBJ (doesn't support vertex colors)
DAE

Textures

These determine the color and material properties of your building.

Resolution

Texture sizes of various vanilla buildings. (Not to scale) See resolution in the top right corner of the preview window.

All imported main textures must be the same resolution.

Powers of 2 is a standard practice in 3D graphics, which means resolutions such as 1024x1024, 1024x512, 256x512, 2048x128 etc. It is recommended to stick to this standard, otherwise, your texture may be corrupted by compression, which may be more visible at longer distances or grazing angles. The smallest allowed resolution is 32x32.

Make sure texture quality is set to high in the game's graphics settings, otherwise, your imported textures will be downscaled to a lower resolution.

LOD Textures

All imported LOD textures must be the same resolution.

If you don't provide LOD textures, the game will try to bake them using the UV mapping your LOD mesh has, and that may cause visual issues, so it's recommended that you create your own LOD textures using baking.

Diffuse

The main color and texture of your asset.

It will look very bright, contrasty, and saturated in the game, so make sure to reduce the saturation and limit the brightest parts to a medium/light gray below 140 RGB.

If you don't import a diffuse map, it will default to white.

Alpha

Example alpha texture for some railings and metal beams.

Using lighter values for the invisible parts will decrease the chance of small details like railings disappearing completely.

Transparency, white means opaque or visible, black means transparent or invisible. Gray values may affect how it looks from a distance or at an angle.

Semi-transparency is not supported, you need to use the rotors shader for that.

If you don't import an alpha map, it will default to fully opaque or fully visible.

Color

Determines which parts will be affected by color variations. White means fully affected and black means not at all.

The diffuse will get multiplied by the color variation, that means the resulting color will look darker than the original diffuse.

If you don't import a color map, it will default to full color, but the 'use color variations' setting must be enabled for the colors to appear.

Illumination

Buildings can have two different types of illumination - diffuse contribution illumination in the 0-120 range, which is almost never used, and random night window illumination in the 128-255 range, which is what most buildings use.

If you don't import an illumination map, it will default to no illumination.

Random Night Windows

Example illumination map showing both gradients.
192-128 inverted (bottom)
192-255 (top).

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Colors for randomly illuminated night windows:

192 (Neutral Background Color)
192-128 Inverted (First Set of Windows)
192-255 (Second Set of Windows)

You can create a black and white illumination texture and use a levels adjustment to set the output colors so that black becomes 192 and white becomes 128 for one set of windows, and black becomes 192 and white becomes 255 for the other set.

Diffuse Contribution

0-120 is always turned on illumination based on the diffuse. It's not recommended to mix the two different types of illumination on one texture as it can create aliasing problems.

Specular

Example specular map showing high values for windows and very low values for the rest.

Transitions between different specular values produce artifacts on the normal map and vice versa, even if a normal map is not imported.

Reflectivity, white values will become 'windows' where the fake interior floor will be visible.

The specular highlight from the sun is very big and bright, so you might want to use very low (0-10%) specularity for surfaces facing upwards, like roofs.

If you don't import a specular map, it will default to no specularity.

Normal

Problem: normal maps appear incorrectly if the asset importer mesh rotation feature is used.

Problem: default normal map value is 0.5, which isn't possible by using 127(left) or 128(right). Image shows the same flat normal map on faces with different UV rotation/flip.

Also sometimes called a bump map, adds fake depth or form by affecting how the lighting appears.

This can be made from the diffuse or a height map (brighter colors will look extruded out more) using a normal map generator online, a photoshop plugin like xNormal, or standalone software such as CrazyBump.

The normal map generator should be set to +X +Y, which means no color channel inversions are required. Read more in the normal map article.

High specularity and normal map don't work well together because of the compression, so you might want to paint over your windows and other shiny parts with a solid color before generating a normal map or paint over these parts 128,128,255 on the final normal map.

If you don't import a normal map, it will default

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