# Unity Sprite/Texture Optimization 🖼️

## Sprite config setting

1. Alpha Sources -> Texture 有 Alpha 才需選擇
2. Read/Wite Enabled -> 有需要讀寫貼圖才需要打勾
3. Generate Mip Maps -> 有需要 LOD 才需要勾選 (需要Z軸改變的情形, 若是 UI/normal map 則不勾選)
4. Filter Mode -> Bilinear
5. 除 UI 以外, 解析度都需要為 2N 次方
6. Max Size 根據狀況調整（一般貼圖1024或512，若是icon為64或256）

## Sprite Atlas
1. 使用 Sprite Atlas 將 UI-Sprite 進行打包

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## Texture config setting
1. 3D 模型的貼圖, Alpha Source 設定為 None (移除不使用的 Aplha通道)
2. Read/Write Enable 取消勾選
3. Generate Mip Map 取消勾選 (若需要遠距離觀看貼圖, 在勾選)
4. Max Size 一般設為 1024(或512), 若需要清楚觀看貼圖細節再設為 2048.

## Texture compression

* Desktop browsers (WebGL) with ==DXT== set as the texture compression format
* Mobile browsers (WebGL) with ==ASTC== set as the texture compression format
* Mobile devices (IOS/Android) app with ==ECT2== set as the texture compression format

## Crunch Compression
If you want to reduce your build size, you may be able to apply another compression pass to your textures. That’s what we call crunch compression.


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* Ref.
https://thegamedev.guru/unity-gpu-performance/texture-compression-and-formats/