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Add glTF-KTX-BasisU variant for FlightHelmet #270

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Add glTF-KTX-BasisU variant for FlightHelmet #270

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37 changes: 36 additions & 1 deletion Models/FlightHelmet/README.body.md
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Expand Up @@ -4,4 +4,39 @@

## Description

USAAF A-11 Flying Helmet on a wooden stand with realistic high resolution textures.
USAAF A-11 Flying Helmet on a wooden stand with realistic high resolution textures.

## KTX2 BasisU Textures

The model in [glTF-KTX-BasisU](./glTF-KTX-BasisU) has been processed with [glTF-Transform](https://gltf-transform.dev/) v4.3.0 to convert the images from PNG to [KTX](https://www.khronos.org/ktx/) with Basis Universal texture compression and the extension [KHR_texture_basisu](https://github.com/KhronosGroup/glTF/blob/master/extensions/2.0/Khronos/KHR_texture_basisu/). The color textures are compressed using ETC1S and the non-color textures using UASTC, both with default settings.
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```
gltf-transform etc1s FlightHelmet.gltf FlightHelmet.gltf --slots "baseColor"
gltf-transform uastc FlightHelmet.gltf FlightHelmet.gltf --slots "{normal,occlusion,metallicRoughness}"
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```

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### Texture Sizes

| Name | Before | After | Delta | Type |
|:------------------------------------|------------:|------------:|-------------:|:------|
| GlassPlasticMat_BaseColor | `2.20 MB` | `304.42 KB` | `-1.90 MB` | ETC1S |
| GlassPlasticMat_Normal | `2.53 MB` | `2.63 MB` | `+107.07 KB` | UASTC |
| GlassPlasticMat_OcclusionRoughMetal | `3.52 MB` | `3.65 MB` | `+123.32 KB` | UASTC |
| LeatherPartsMat_BaseColor | `5.22 MB` | `481.57 KB` | `-4.75 MB` | ETC1S |
| LeatherPartsMat_Normal | `5.41 MB` | `3.64 MB` | `-1.77 MB` | UASTC |
| LeatherPartsMat_OcclusionRoughMetal | `4.17 MB` | `3.97 MB` | `-212.72 KB` | UASTC |
| LensesMat_BaseColor | `679.98 KB` | `91.23 KB` | `-588.75 KB` | ETC1S |
| LensesMat_Normal | `5.44 KB` | `1.65 KB` | `-3.80 KB` | UASTC |
| LensesMat_OcclusionRoughMetal | `587.50 KB` | `687.40 KB` | `+99.90 KB` | UASTC |
| MetalPartsMat_BaseColor | `2.56 MB` | `463.22 KB` | `-2.10 MB` | ETC1S |
| MetalPartsMat_Normal | `3.12 MB` | `3.39 MB` | `+275.69 KB` | UASTC |
| MetalPartsMat_OcclusionRoughMetal | `2.84 MB` | `2.97 MB` | `+130.76 KB` | UASTC |
| RubberWoodMat_BaseColor | `3.43 MB` | `431.19 KB` | `-3.01 MB` | ETC1S |
| RubberWoodMat_Normal | `3.17 MB` | `3.31 MB` | `+138.84 KB` | UASTC |
| RubberWoodMat_OcclusionRoughMetal | `3.63 MB` | `3.35 MB` | `-294.65 KB` | UASTC |

### Texture Size Totals

| Before | After | Delta |
|-----------:|-----------:|------------:|
| `43.06 MB` | `29.29 MB` | `-13.76 MB` |
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