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Update glTF 2.0 demo for 'KHR_texture_basisu' #274

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Update glTF 2.0 demo for 'KHR_texture_basisu' #274

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1f51f3f
Update glTF demo for KHR_texture_basisu.
donmccurdy Dec 24, 2021
059ca56
Restore trailing newline to AgiHqSmall.gltf
donmccurdy Dec 28, 2021
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19 changes: 4 additions & 15 deletions webgl/README.md
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Expand Up @@ -4,8 +4,6 @@ Requires WebAssembly and WebGL support.

## Texture

[Live demo: `texture/index.html`](https://basis-universal-webgl.now.sh/texture/)

(Note the Live texture demo hasn't been updated to the latest release yet.)

Renders a single texture, using the transcoder (compiled to WASM with emscripten) to generate one of the following compressed texture formats:
Expand All @@ -22,21 +20,12 @@ On browsers that don't support any compressed texture format, there's a low-qual

## glTF 3D Model

[Live demo: `gltf/index.html`](https://basis-universal-webgl.now.sh/gltf/)

Renders a glTF 3D model with `.basis` texture files, transcoded into one of the following compressed texture formats:
glTF 2.0 assets support Basis Universal compression in KTX2 texture containers, defined in the glTF 2.0 extension [`KHR_texture_basisu`](https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_texture_basisu).

* ASTC
* Tested in Chrome on Android, Pixel 3 XL.
* DTX (BC1/BC3)
* Tested in Chrome (Linux and macOS) and Firefox (macOS).
* ETC1
* Tested in Chrome on Android, Pixel 3 XL.
* PVRTC
* Tested in Chrome and Safari on iOS iPhone 6 Plus.
Further reading:

The glTF model in this demo uses a hypothetical `GOOGLE_texture_basis` extension. That extension is defined for the sake of example only - the glTF format will officially embed Basis files within a KTX2 wrapper, through a new
extension that is [currently in development](https://github.com/KhronosGroup/glTF/pull/1612).
- [Artist guide to KTX2 and Basis Universal](https://github.com/KhronosGroup/3D-Formats-Guidelines/blob/main/KTXArtistGuide.md)
- three.js documentation for [GLTFLoader](https://threejs.org/docs/?q=gltfl#examples/en/loaders/GLTFLoader) and [KTX2Loader](https://threejs.org/docs/?q=ktx2#examples/en/loaders/KTX2Loader)

![Screenshot showing a basis texture rendered as the base color texture for a 3D model in a webpage.](gltf/preview.png)

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