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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
Vertex attribute arrays (va_\*) are resources that contain a packed float32
array. ombinations 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 | |
| g_unlit | | |
| 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].
- **Unlit**: Directly transfers \*_albedo to the screen if set. No lighting
shaders are applied.
## LightPart
| Key | Value Type |
| -------- | ------------------ |
| radius | Float |
| emission | Vec3 |
| spot | Vec3, Float, Float |
- **Emission**: Luminous intensity in candela per channel. Equivalent of `color`
multiplied with `intensity` of [KHR_lights_punctual].
- **Radius**: Radius for soft shadow calculation. If set, the light source can
be modelled to be a light emitting sphere of that radius. Not suported by
glTF.
- **Spot**: Normalized direction vector, inner and outer cone radius like
`innerConeAngle` and `outerConeAngle` in [KHR_lights_punctual].
## EnvironmentPart
| Key | Value Type | |
| ------ | ---------- | ---------------- |
| skybox | Resource | |
| sun | Vec3, Vec3 | Direction, Color |
## Texture
WebP
[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
[KHR_lights_punctual]: https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_lights_punctual
|
