# Extended PBR Model This model offers more attributes than the **PBR Model**. It allows for selecting and editing: * `Environment` * `Normal Mapping` * `Albedo Texture`, `Color`, and `Blending` * `Specular Color` * and several aspects of `Occlusion Metallic Roughness`. 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-796f11e24cad141b64122f44e4f6ed276f6f44ef%2Fextendedpbrmaterialmat1.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-26d4dacde88cc416a4c240b0634ecdbb33e9c4cb%2Fextendedpbrmat2.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 somewhat see-through 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-7780c73437adbf0ee52ea477774b24fccbbcb44f%2Fextendedpbrmaterial4.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. ### Albedo ![Albedo](https://2561100106-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Ff6JZovzOqBctA4C1o76u%2Fuploads%2Fgit-blob-e2d4b469f9134cb25e42941edcce269bbb8efd3a%2Fextendedpbrmaterial5.png?alt=media) `Color` of `Albedo` sets the base diffuse color of the model. `Texture` takes any image to add any desired visual information. Using `Blending`, the `Texture` and `Color` are combined. If `Blending` is set to 1 then 100% of the `Texture` is displayed on the **Object**. If 0.5, then it displays a 50/50 ratio of `Texture` and `Color`. ### Specular ![Specular](https://2561100106-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Ff6JZovzOqBctA4C1o76u%2Fuploads%2Fgit-blob-185a4fe7321a170516d3953681a803c836995f87%2Fextendedpbrmaterial6.png?alt=media) `Specular` is the point of reflection of the light source. `Color` sets the color of it. ### Occlusion Metallic Roughness ![Occlusion Metallic Roughness](https://2561100106-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Ff6JZovzOqBctA4C1o76u%2Fuploads%2Fgit-blob-1cfa6bb4a5428aad92369407eb173a114edd0409%2Fextpbrocclusionmetrough.png?alt=media) `Use Occlusion` toggles occlusion on and off. `Occlusion Map` sets an image for occlusion. *Occlusion* itself delivers shadow properties. Considering the RGB channels, *Occlusion* only uses the red channel (keep this in mind when making `Texture` files). Even without a light source, the `Texture` will show up as a shadow and light on the **Object**, simulating a bright side and dark side. *Occlusion* makes it possible for the user to make a texture for an **Object** that simulates another **Object** throwing a shadow on the first **Object**. `Use Met. Rough.` toggles metallic roughness on and off. `Met. Rough. Map` sets an image for metallic roughness to contribute to the overall texture of the metallic material. `Metallic` determines how much the surface simulates a metal-like quality, appearing shinier and harder or rougher and duller. `Roughness` determines how rough an **Object** is, limiting or strengthening reflectivity. ### 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 Map`: albedo\_map * `Color` (Albedo): albedo\_color * `Blending`: albedo\_map\_blending * `Color` (Specular): specular\_color * `Use Occlusion`: use\_occlusion\_map * `Occlusion Map`: occlusion\_map * `Use Met. Rough.`: use\_metallic\_roughness\_map * `Met. Rough. Map`: metallic\_roughness\_map * `Metallic`: metallic * `Rougness`: roughness