# Glass Model

This model represents materials with a glass-like quality. It allows for selecting and editing:

* `Environment Mapping`
* `Normal Mapping`
* `Base Texture`, `Color`, and `Blending`
* `Reflection Color`, `Roughness`, and `Fresnel`
* as well as adjusting `Shadow Sensitivity`.

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

![](/files/yBKusgMGyPQMS4dZVYxC)

## Attributes

### Material

![Material](/files/yWnPxRdRaOil8iDUnCPc)

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](/files/HALlOtCVdtcMjswUkhCK)

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](/files/SLepMDfZuQWXXkQGB9ci)

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

![Base](/files/Eci3y90qq1ftacr7iycx)

`Color` of `Base` 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`.

### Reflection

![Reflection](/files/gDRnoVnG3CtigBoY8XVu)

These **Attributes** simulate a reflective surface. `Roughness` determines how rough an object is, limiting or strengthening reflectivity.

`Fresnel` 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](/files/mP9Z3j0HFXaTDayqslUP)

`Shadow sensitivity` determines the percentage of influence by the shadow. For example, a 1 would set an **Object's** surface to completely black. 0.5 would mean that even if the **Object** is in shadow, it would still have 50% of its color.


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