Spa/Sph 高光貼圖介紹
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MMD內的Spa及Sph是一種球型紋理,類似於Matcap的一種渲染模式。
它是針對模型法線朝向和當前視角變化而應用效果,不直接透過UV變化。
![notion image](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2Fc92c543f-73c0-422d-b8bc-ef1aeaaa95d2%2Fimage_(1).png?table=block&id=e8232afc-e9f5-41a4-9cde-2dcbe8f1cc8e&t=e8232afc-e9f5-41a4-9cde-2dcbe8f1cc8e)
![調整了一個頂點法線](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2Fd890918f-e196-4f8b-b337-1791cf78a4be%2Fimage_(2).png?table=block&id=2b609bd7-bb42-431a-81ee-dca0879b265e&t=2b609bd7-bb42-431a-81ee-dca0879b265e)
有不少地方可以下載到別人的高光貼圖素材,比如Niconico,不過這種貼圖是有差別的,分別是加法、乘法。
加法
相當於線性加亮,加法一般用於增加光感,比如頭髮的偽各向異性效果,皮膚邊緣的光澤、布料質感。
是在原始的貼圖上加上加法高光貼圖的紋理,黑色為無高光效果,也就是只顯示原始貼圖。
乘法
相當於線性加深,乘法跟加法有點不一樣的地方是,黑色的地方真的會全黑以外,還會連同Alpha一起處理,一般用於金屬質感、鏡片等,下面放個對比。
對比
![原高光貼圖](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2Fae7b8564-8014-4641-b135-fed76037c7f9%2Fspa1.png?table=block&id=df535ac8-dfdb-4d1f-8a60-f418ea641f29&t=df535ac8-dfdb-4d1f-8a60-f418ea641f29)
![原底圖](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2F811842fc-7386-4039-9760-dc92af3516d4%2Fspa4.png?table=block&id=0846b045-34a4-4530-9c78-5fad04ee6c0e&t=0846b045-34a4-4530-9c78-5fad04ee6c0e)
![加法](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2F01a21e11-6127-400e-a2a6-f72abf4c4aae%2Fspa2.png?table=block&id=3b580016-6f52-4b0a-a32e-44d04b03e64e&t=3b580016-6f52-4b0a-a32e-44d04b03e64e)
![乘法](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2Fb279790b-d464-4c9f-9a32-5f59cc34681c%2Fspa3.png?table=block&id=76ca4f39-0a01-45e6-b378-0ac7930260d1&t=76ca4f39-0a01-45e6-b378-0ac7930260d1)