Learn to use Blender and Photoshop to make a Cities Skylines asset! In this example, we create a pack of 6 cubes with varying textures and sizes, and upload. Cities Skylines UBERMOD Pack. First of all - decide which option you like to use - you can download 5-50-500 mods avaiable in this package. Check out the list and look for stuff that you like. You can check out all addons I've chosen for this package, but if you are too lazy to add them manually you can just click 'Subscribe to all.

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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.

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.

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. Best movie download app for windows 10.

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).

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 to a flat normal map - no bump.

Format

Use a lossless format like .PNG.

The game supports other formats as well, but there is no reason to use another one, it doesn't matter how much your texture is compressed or even if it's completely solid or complicated, the game will convert it to a DXT format, so the final size won't be affected by anything other than resolution.

Make sure the texture is 8 bits/channel because a 16 bits/channel image can't be imported.

Import

Example Asset

Source files of an example building ready for import.

Naming

The mesh can have any name, but it's not recommended to use spaces or underscores, as the name for the lod mesh name will be meshname_lod.

The textures must have the same name as the mesh, but with the texture type identifier after it, so the result will be names like meshname_d.png and meshname_lod_d.png

Import Folder

Files ready for import.

You should place the mesh and texture files in the import folder located here:

C:UsersUsernameAppDataLocalColossal OrderCities_SkylinesAddonsImport

The AppData folder is hidden by default, you can access it by pressing Windows + R and typing in appdata.

Template

There is a 'load existing props and decorations' toggle on the bottom left, this will load props and networks like roads/tracks/paths from your chosen template as well, useful when you need to reimport an already imported asset but don't want to place those things again.

The template you choose will determine many things about your building:

• AI and corresponding stats (a school with students, a fire station with fire trucks etc.)
  
• milestone at which it is unlocked
  
• UI category
  
• item class (UI sub-category)
  
• general settings (flatten terrain, use color variations etc.)
  
• shader, material properties (color variations)

Import

After you choose your mesh, depending on how it was exported, you might need to set the correct scale and rotation, scale 100 and rotating 3 times around X-axis are common necessities.

Editor

Lot Size

For growables, the lot also includes an optional yard area for props.

Size of the building area in cells, each cell is 8x8m.

For growables, the size is limited to 4x4.

For other buildings, max sizes are 16x8, 15x9, 14x11, 13x12, 12x13, 11x14, 9x15 and 8x16.

General Properties

• use color variations (may require to save/load for the toggle to take effect)
  
• availability (ingame, map editor etc.)
  
• circular lot (used for the vanilla wind turbine, water tower)
  
• expand front yard (puts optional yard for props in front instead of back)
  
• flatten full area (makes sure the terrain is flat up to the lot edges)
  
• flatten terrain (tries to flatten terrain in a softer way)

Stats

Based on which AI the building has, it can have different stats like electricity consumption, worker amount, police car count for a police station etc.

Material properties

You can change the 4 color variations, and also floor parameters which are used for the fake interior for 100% specular windows.

Networks

Vanilla train station pedestrian paths (magenta) connecting the roadside to the platform.

You can place networks such as roads, train/tram tracks, and pedestrian paths. Read more about network usage in specific cases such as train stations.

Props & Trees

You can place props such as benches, lights, and antennas.

If you place a prop on the ground, it will follow the terrain if the building is placed on uneven terrain. But if you place it on the building, it becomes fixed height, so it will always be at that height relative to the building.

Surface

Each cell can have its own surface:

• Pavement (map theme texture)
  
• Gravel (map theme texture)
  
• Ruined (map theme texture)
  
• Field (map theme color)
  
• Clip (hole in the ground)

Markers

These are invisible props which have functionality such as building entry points, parking spaces or smoke particle effects.

Sub-buildings

Once a sub-building has been added, you can change its position precisely.

You can add other buildings as sub-buildings to your main building. Unlike props, they are not references to another asset, they actually get embedded and saved into the main building asset.

This is useful for multi-function buildings or adding a part using a different shader.

The fixed height option makes sure the sub-building stays the same height even on uneven terrain.

Sub-buildings don't grow on growables, they are only visible if the growable is plopped manually.

If you just imported a building for it to be used as a sub-building, you need to reload the game for it to be properly loaded and available as a sub-building.

Sub-meshes

You can add additional meshes as sub-meshes, which appear only when specific conditions are met, for example - the vanilla landfill uses multiple sub-meshes to display how filled up it is.

Flags

Flags are required and forbidden conditions, which determine when the sub-mesh shows up.

There are many flags and their use is not always obvious so their descriptions might be incomplete or not relevant in all cases.

Created

Active for all created buildings.

Deleted

Unknown.

Original

Likely active for buildings which were on the map originally, not created by the user.

CustomName

Active for buildings which the user has renamed.

Untouchable

Likely active for buildings which cannot be clicked by the user.

FixedHeight

Likely active for buildings which will not change their height based on water level changes.

Incoming

Likely related to vehicles arriving at the building.

Outgoing

Likely related to vehicles leaving the building.

CapacityStep1 (First Half Filled)

Active for buildings which have their capacity at 50%, such as cemetaries, landfills, snow dumps, warehouses, or processing facilities.

CapacityStep2 (Second Half Filled)

Same as CapacityStep1 but 100%.

RateReduced

Likely active for buildings which are operating at a reduced rate.

HighDensity

Likely active for high density residential and commercial buildings.

LevelUpEducation

Unknown.

LevelUpLandValue

Unknown.

RoadAccessFailed

Likely related to pathfinding failure.

Evacuating

Likely active for buildings during disaster evacuation.

Completed

Active for buildings which have completed being constructed.

Active

Active for operating buildings.

Abandoned

Active for abandoned buildings.

Demolishing

Unknown.

ZonesUpdated

Related to zoning being updated.

Downgrading

Unknown, likely related to buildings with capacity being emptied.

Collapsed

Likely active for collapsed buildings.

BurnedDown

Same as Collapsed. Likely active for buildings which have burned down.

Upgrading

Likely active for buildings which are leveling up.

Loading1

Related to animation playback on cargo station buildings.

Loading2

Related to animation playback on cargo station buildings.

SecondaryLoading

Related to animation playback on cargo station buildings.

Hidden

Unknown.

EventActive

Unknown.

Flooded

Likely active for buildings which are flooded.

Filling

Unknown.

Historical

Likely used for buildings which have been marked as historical by the player.

Editor Advanced

Various things can be changed with the use of ModTools scene explorer Ctrl+E or running scripts in the console F7, or specific mods.

AI

AI defines how the building behaves and what values it has. It can be changed using Asset AI Changer by Snow_Cat & cerebellum.

If you want a functionless decorative building, DecorationBuildingAI is a good choice.

But if you want your building to be sinkable into the ground without lowering terrain - use BuildingAI, however, a side effect is it won't get wet in the rain, or snowy on winter maps.

Item Class

Contains information about what type and level of building it is. It can be changed using Asset ItemClass Changer by Snow_Cat.

UI Category

UI category determines in which menu your asset will appear. It can be changed using Asset UI Category Changer by Snow_Cat

UI Priority

UIPriority determines item order in the menu. It can be changed Asset UI Priority Changer by Snow_Cat or a script.

Shaders

Default

Comparison between Default (left), NoBase (middle) and Fence (right) building shaders.

Default extends the base mesh into the ground and applies the map theme building base texture to it.

NoBase

On winter maps, snow doesn't appear on the NoBase shader.

When using the default building shader, parts that are under 0 (ground) will get the map theme building base texture.

NoBase doesn't replace the underground texture with the building base texture.

The base mesh may still be visible, as it's generated on import for edges closer than 5cm to 0 (ground). It is possible to delete the base mesh completely using this script.

This shader also has a side-effect of increased reflectivity for high specularity areas.

Fence

Fence conforms to the terrain. (used for the vanilla cemetery and Japanese garden)

Floating

Floating waves in water. (used for Mass Transit DLC boat museum steamboat)

Shader Properties

Some shaders have specific hidden properties, such as the WindTurbine shader and AnimUV building shader.

Placement Mode

This determines how your asset must be placed:

• Roadside
  
• Shoreline
  
• OnWater (also disables water collision)
  
• OnGround (can't be placed on water)
  
• OnSurface (same as OnGround but can be placed on water)
  
• OnTerrain (same as OnSurface but in water, not on it)
  
• ShorelineOrGround
• PathsideOrGround

It can be changed with ModTools scene explorer Ctrl+E by going to Tool Controller > ToolController > m_editPrefabInfo > m_placementMode.

Zoning Mode

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This is used only for growables to make them grow only on corners:

• Straight (default)
  
• CornerLeft
  
• CornerRight

It can be changed with ModTools scene explorer Ctrl+E and going to Tool Controller > ToolController > m_editPrefabInfo > m_zoningMode.

Specific Cases

This section covers some specific types of buildings which do not have a template or require special instructions. It will also make references to using ModTools, and other mods mentioned in the editor advanced section.

For buildings such as stations and harbors, Advanced Buildings Editor by BloodyPenguin is recommended for making all segments editable and auto-placing spawn points which are used to spawn trains, ships, or planes.

Various station tracks and invisible connection paths can be accessed in the asset editor road and decoration menu by using More Network Stuff by BloodyPenguin and they can be moved using Move It!.

Train Station

The train station has a template.

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Train stations require a train station track, which contains pedestrian stop paths 1 meter above the track where citizens wait for the train. The stations also have invisible pedestrian connection paths leading to the station track.

Cargo Train Station

Cargo train station doesn't have a template. You can download a premade template here or you can use the regular train station template, but change the AI to CargoStationAI and the item class to Train Cargo Facility.

Cargo train stations work with any train station track, but a special cargo station track which doesn't have pedestrian stop paths exists. They also have invisible cargo connection paths which are used by the cargo vehicles to enter and exit the station.

Harbor

The harbor has a template.

Harbors require a ship dock path and ship dockway paths, and also a pedestrian connection path.

Cargo Harbor

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Cargo harbor doesn't have a template. You can download a premade template here or you can use the regular harbor template, but change the AI to CargoHarborAI and the item class to Ship Cargo Facility.

Cargo harbors require a ship dock path and ship dockway paths, and also a pedestrian connection path.

Airport

Airports have templates.

Airports use runways and taxiways as expected. For the terminals they use airplane stop paths.

Monorail Station

Monorail stations have templates.

The monorail station track and road can be accessed by using the ModTools scene explorer Ctrl+E and going to Expansion 4 > NetCollection > m_prefabs > Monorail Station Track / Medium Road Monorail Elevated > Plop.

Cable Car Stop

Cable car stops have templates.

The cable car stop networks can be accessed by using the ModTools scene explorer Ctrl+E and going to Expansion 4 > NetCollection > m_prefabs > CableCar Stop > Plop.

Save

Filename

The filename input is on the bottom left, this is what the actual file will be called. It's not recommended to use spaces, dots, or special symbols.

Asset Name

The asset name visible ingame, the name people should search for.

Images

There are 2 different folders you can open by clicking the folder icons:

Snapshot

On the snapshot image, bottom right corner. Use this one to replace the snapshot, you can replace it with a 1x1 px image to save on the asset file size. This image will only be visible in the content manager. It will also default as the Steam preview image, but you can change that separately when publishing.

Thumbnail & Tooltip

Below thumbnail, on the right side. Use this one to change the thumbnail (109x100) and tooltip (492x147) of your asset.
Once you change the main thumbnail, the hover/active states will update automatically.

Local Assets Folder

CRP files in the local assets folder.

Once the asset is saved, the .crp file will appear in the local assets folder:

C:UsersUsernameAppDataLocalColossal OrderCities_SkylinesAddonsAssets

The AppData folder is hidden by default, you can access it by pressing Windows+R and typing in appdata.

Publish

Once you have saved the asset and reloaded the game, you can publish the asset.

Go to the content manager > assets and find your asset, then click share.

Title and Description

You can change these on the Steam Workshop later.

Steam Preview Image and Content Folder

Publish window and content folder.

There is a folder icon again on the snapshot image, bottom right corner. Here you can change the Steam preview image, which is the thumbnail visible on steam. The largest size the image will be visible is 437x437 (on the front page) but it will get upscaled to 512x512 by Steam so that's the size you should use.

There is also the content folder, which is where the actual asset file is. You can paste multiple .crp files here if you would like to upload a pack of assets.

Steam Workshop

On the Steam Workshop page for your asset, you can:

• add it to a collection
  
• add images and videos
  
• add contributors and links
  
• add required items and DLC
  
• change visibility to friends only or private

Update

To update your own item, you must subscribe to it first, then it will show up in the content manager. It won't be the same as a local asset, as it will show an 'update' button.

When you click update, click the folder icon, and now you can change the Steam preview image and put your new asset in the content folder. If updating a pack, remember to put all the assets inside the content folder.

You can also add more assets to make it a bigger pack.

Prefab Name

Comparison between local (top) and workshop published (bottom) prefab names shown in ModTools.

This is not something you can change.

It's the hidden internal name used to refer to your asset in savefiles.

It's the reason why a local asset is not the same as a workshop published asset.

For local assets: filename.Asset Name_Data
For published workshop assets: SteamID.Asset Name_Data