# Supported Formats & Standards

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### Supported 3D Formats:

Polygon Streaming supports the following formats:

* **.GLB**
* **.glTF** (zipped)
* **.OBJ** (zipped)

It’s **highly recommended** to use a single **.GLB** file to convert your 3D models. This will ensure that the file contains all the necessary data, and its following the correct standards used during conversion. **3D models must be a triangulated mesh with PBR materials following metallic-roughness standards.**

* In case you use a **.glTF** model, all the necessary files need to be zipped into a single **.zip** file. It should at least contain a **.gltf** file, a **.bin** file and all the texture images in the formats **.jpg** or **.png**.
* In case you use a **.OBJ** model, all the necessary files need to be zipped into a single **.zip** file. It should contain a **.obj** file, a **.mtl** file, and all the texture images in the formats **.jpg** or **.png**, making sure they are properly set and connected. You can also upload a single **.obj** file in case there are no textures or .mtl file needed. 

{% hint style="info" %}
Note that in case the textures are not properly connected in your file, they will appear as plain white after conversion. A single .obj file will always look plain white since it doesn’t contain material or texture information.
{% endhint %}

### Lightmap Support

Image-based lighting (or "lightmapping") can save GPU processing time by baking real-time lighting information into static images that are then overlaid on models as texture maps. Currently, a single lightmap is supported via a separate file. When uploading your model to <https://stream.viverse.com/>, package it in a `.zip` file containing your `.glb` or `.obj` and a file named either `lightmap.hdr` or `lightmap.png`. This lightmap will be automatically applied to the Streaming Model inside PlayCanvas when running the VIVERSE Create SDK, and should be using the first UV set, often called `UV0`. There is no size limit to this lightmap, but most browser will error on image files larger than 8k. *To reiterate, only one (1) lightmap file is supported at this time.*

### Supported Image Formats

* JPG
* PNG
* BMP
* KTX

### Supported PBR Standard Texture Maps:

* Diffuse/Albedo
* Metallic/Roughness
* Transparency/Opacity
* Normals
* Ambient Occlusion
* Emissive

### Supported glTF Extensions:

* KHR\_draco\_mesh\_compression
* KHR\_materials\_unlit
* KHR\_texture\_basisu
* KHR\_materials\_specular
* KHR\_materials\_pbrSpecularGlossiness
* KHR\_texture\_transform
* KHR\_materials\_ior
* KHR\_materials\_transmission
* KHR\_materials\_volume
* KHR\_materials\_clearcoat


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