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# Resource formats
## Dictionary format
```
[kkkk vvvv KK... VV...]...
^ ^ ^ ^
| | | | value
| | | key
| | 16-bit kalue length
| 16-bit key length
```
## PrefabIndex
| Key | Value Type |
| -------- | ---------- |
| \<Name\> | Resource |
## Prefab
| Key | Value Type | |
| ----------- | ---------------------------- | --------- |
| mesh | Matrix3, Vec3, Res<MeshPart> | Multi key |
| light | Vec3, Res<LightPart> | Multi key |
| environment | Res<EnvironmentPart> | |
## MeshPart
Combinations of g_\*, va_\* and tex_\* are multiplied except normal which is
added. Defaults should be the identity for that operation, so default is 1 /
white except normals are zero.
| Key | Value Type | | |
| ------------------ | ------------- | - | ------------------ |
| index | Resource | | |
| g_metallic | Float | | |
| g_roughness | Float | | |
| g_albedo | Vec3 | | |
| g_alpha | Float | | |
| g_transmission | Float | | |
| g_emission | Vec3 | | |
| g_refractive_index | Float | | |
| g_attenuation | Vec3 | | |
| g_dispersion | Float | | |
| g_thickness | Float | | |
| va_position | [Resource; 3] | | |
| va_normal | [Resource; 3] | | |
| va_texcoord | [Resource; 2] | | |
| va_roughness | Resource | | |
| va_metallic | Resource | | |
| va_albedo | [Resource; 3] | | |
| va_alpha | Resource | | |
| va_transmission | Resource | | |
| va_emission | Resource | | |
| tex_normal | Resource | | Use color channels |
| tex_roughness | Resource | | Use green channel |
| tex_metallic | Resource | | Use blue channel |
| tex_albedo | Resource | | Use color channels |
| tex_alpha | Resource | | Use alpha channel |
| tex_transmission | Resource | | Use red channel |
| tex_emission | Resource | | Use color channels |
| tex_thickness | Resource | | Use green channels |
- **Attenuation**: Attenuation coefficient for each color channel due to
scattering within the material volume expressed as e-folding distance (m^-1).
See [KHR_materials_volume].
- **Transmission**: Equivalent to `transmissionFactor` and `transmissionTexture`
of [KHR_materials_transmission].
- **Refractive Index**: Equivalent to `ior` of [KHR_materials_ior]
- **Thickness**: Equivalent to `thicknessFactor` and `thicknessTexture` of
[KHR_materials_volume].
- **Dispersion**: 20 / Abbe Number. Equivalent to `dispersion` of
[KHR_materials_dispersion].
[KHR_materials_transmission]: https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_materials_transmission
[KHR_materials_ior]: https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_materials_ior
[KHR_materials_volume]: https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_materials_volume
[KHR_materials_dispersion]: https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_materials_dispersion
## LightPart
| Key | Value Type |
| -------- | ---------- |
| radius | Float |
| emission | Vec3 |
## EnvironmentPart
| Key | Value Type | |
| ------ | ---------- | ---------------- |
| skybox | Resource | |
| sun | Vec3, Vec3 | Direction, Color |
## Texture
WebP
|
