# 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://2561100106-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Ff6JZovzOqBctA4C1o76u%2Fuploads%2Fgit-blob-13c4a1020463c08ea2196be86a668ae46f331c97%2Fcarpaintmodel0.png?alt=media) ## Attributes ### Material ![Material](https://2561100106-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Ff6JZovzOqBctA4C1o76u%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://2561100106-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Ff6JZovzOqBctA4C1o76u%2Fuploads%2Fgit-blob-2fa29745799cab8b7d9471cbf4aba0f99fc955d0%2Fpbrenvironmentmap.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.). Initially, there is only the **Attribute** `Overwrite Env.` which is toggled off by default. If it is toggled on, all of the other **Attributes** are revealed. `Environment Map` is the desired **Texture** to be used (a *equirectangular* or *cubemap* **Texture** of type *PNG*, *JPG*, *EXR*, or *HDR*). `Tint` provides the color of the tint. The **Texture’s** RGB channels (not alpha) are then multiplied by the chosen tint. `Exposure` determines how bright the **Texture** should be with a value from 0 to infinity. `Rotation` sets the beginning of the image of the provided `Texture` to be "delayed" in the x or direction, moving it from left to right. The resulting "cut off" piece wraps around to the start of the image. Its range is from 0 degrees to 360 degrees. `Tilt` sets the beginning of the image of the provided `Texture` to be "delayed" in the y or direction, moving it from bottom to top. The resulting "cut off" piece wraps around to the start of the image. Its range is from -90 degrees to 90 degrees. `Projection Height` is where the ‘point of visualization’ starts. If set to 50%, this would be halfway from the bottom of the image and it would display upwards from there. To see a visual example of this, please refer to the video linked [here](https://www.youtube.com/watch?v=7axPpWTcFrw). ### Normals ![Normals](https://2561100106-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Ff6JZovzOqBctA4C1o76u%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://2561100106-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Ff6JZovzOqBctA4C1o76u%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://2561100106-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Ff6JZovzOqBctA4C1o76u%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. `Fesnel` 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://2561100106-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Ff6JZovzOqBctA4C1o76u%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. ### Property Names It is possible to hover over each **Attribute** and access their property names to be used in code or **Nodes**. A complete list of these names is as follows: * `Use Alpha`: use\_alpha * `Alpha`: alpha * `Overwrite Env.`: env\_overwrite * `Environment Map`: environment\_map * `Tint`: env\_tint * `Exposure`: env\_exposure * `Rotation`: env\_rotate * `Tilt`: env\_tilt * `Projection Height`: env\_projection\_height * `Use Normal Map`: use\_normal\_map * `Normal Map`: normal\_map * `Albedo` (Base Coat): base\_coat\_albedo * `Specular` (Base Coat): base\_coat\_specular * `Metallic` (Base Coat): base\_coat\_metallic * `Roughness` (Base Coat): base\_coat\_roughness * `Albedo` (Clear Coat) clear\_coat\_albedo * `Specular` (Clear Coat): clear\_coat\_specular * `Metallic` (Clear Coat): clear\_coat\_metallic * `Roughness` (Clear Coat): clear\_coat\_roughness * `Fesnel`: clear\_coat\_fresnel * `Shadow Senstivity`: shadow\_sensitivity