# Car Paint Model

This model represents a material that provides the visual qualities to a car's paint features. It allows for selecting and editing:

* `Environment Mapping`
* `Normal Mapping`
* `Base Coat Color` and `Roughness`
* `Clear Coat Color` and `Roughness`
* `Metallicness`
* and `Shadow` `Sensitivity`.

All these **Attributes** are described in greater detail below.

![](https://4267723012-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FOEts3pBau6LMamSYhGZp%2Fuploads%2Fgit-blob-13c4a1020463c08ea2196be86a668ae46f331c97%2Fcarpaintmodel0.png?alt=media)

## Attributes

### Material

![Material](https://4267723012-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FOEts3pBau6LMamSYhGZp%2Fuploads%2Fgit-blob-93675c39ba9c6d4bca8cf63f3c8beb7524cba829%2Fcarpaintmodel1.png?alt=media)

This **Attribute** provides the `Name` of the **Material** as well as the `Shading model` type. It also sets the `Alpha` value if it is toggled on.

The `Alpha` channel is additional to the RGB channels and adds a kind of transparency to the object by mixing the background and foreground colors. For example, if the `Alpha` value is set to 0.5, then this would result in a 50% mix of the object and its background, providing a semi-translucent quality.

### Environment Map

![Environment Map](https://4267723012-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FOEts3pBau6LMamSYhGZp%2Fuploads%2Fgit-blob-5454d45940e626109f618df50593b4c101bc9210%2Fcarpaint-attr-enviromentmap.png?alt=media)

This enables the user to set a `Texture` which reflects the environment around an **Object**, meaning that the **Object** reflects the surface surrounding it (whether that be the background, another **Object**, or both combined.).

The two types of offset allow the beginning of the image on the provided `Texture` to be "delayed" in either the x or y direction. The resulting "cut off" piece wraps around to the start of the image.

`U offset (deg)` moves the image from left to right (X-axis) and `V offset (deg)` moves the image from bottom to top (Y-axis).

### Normals

![Normals](https://4267723012-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FOEts3pBau6LMamSYhGZp%2Fuploads%2Fgit-blob-8167689206d363e36224e3a5401e96128eeb093d%2Fcarpaint-attr-normals.png?alt=media)

A normal is a line perpendicular to the surface of some object. *Normal mapping* distorts these normals and simulates a surface with light and shadow, even if the object surface itself is flat. This is only possible with a light source. The `Normal Map` sets this surface and `Use Normal Map` toggles it on and off.

### Base Coat

![Base Coat](https://4267723012-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FOEts3pBau6LMamSYhGZp%2Fuploads%2Fgit-blob-74c25105ee5f79ba9f3d6514945fc934d6d473be%2Fcarpaintmodel2.png?alt=media)

`Albedo` is the base diffuse color of the car.

`Specular` is the point of reflection of the light source.

`Roughness` determines how rough an object is, limiting or strengthening reflectivity.

`Metallic` determines how much the surface simulates a metal-like quality, appearing shinier and harder or rougher and duller.

### Clear Coat

![Clear Coat](https://4267723012-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FOEts3pBau6LMamSYhGZp%2Fuploads%2Fgit-blob-51f6679563b04b1834cb2327f0c54480226fc746%2Fcarmodel3.png?alt=media)

The `Albedo` here is the color of the glossy finish of a car, which sits at the top layer as a color that one can see through.

`Specular` is the point of reflection of the light source.

`Roughness` determines how rough an object is, limiting or strengthening reflectivity.

`Metallic` determines how much the surface simulates a metal-like quality, appearing shinier and harder or rougher and duller.

`Fesnell` encompasses the idea of the angle of incidence (the angle between the line of sight of the observer and the object being observed) influencing the perceived reflectivity of a surface. A wider angle creates less reflection and a smaller angle creates greater reflection.

### Tweak

![Tweak](https://4267723012-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FOEts3pBau6LMamSYhGZp%2Fuploads%2Fgit-blob-288ba7c1d49c90438afb53c2590670b71a191ff8%2Fcarpaint-attr-tweak.png?alt=media)

`Shadow sensitivity` decides the percentage of the shadow's influence. So if set to 0, the surface will not be influenced by the shadow at all. At 100% the surface would be totally black and at 50%, even if the **Object's** surface stands in a shadow, it will still retain 50% of its own color.