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上一期，我们用代码渲染了一片写实的海
Last time, we rendered a photoreal sea with code.

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这一次，场景不变，只换着色器，看看它能变成什么样
This time the scene stays the same — we only swap shaders and see what it becomes.

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第一种，像素风
First: pixel art.

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先把画面降到三百二十乘一百八十的分辨率
Drop the render down to 320 by 180,

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再把颜色限制在二十四色的调色板里
limit the colors to a 24-color palette,

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用有序抖动模拟过渡
fake the gradients with ordered dithering,

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最后描上一圈深色轮廓
and trace dark outlines around the shapes.

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第二种，低多边形。把地形切成三角网格
Second: low poly. Cut the terrain into a triangle grid,

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每个三角形只是一个平面
where every triangle is one flat plane.

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法线不再平滑插值，每个面一种颜色
Normals no longer interpolate — one color per face,

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海浪也变成了起伏的折面
and even the waves become folded facets.

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第三种，卡通渲染
Third: toon shading.

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把光照量化成几个色阶，阴影偏向冷色
Quantize the lighting into a few bands and tint the shadows cool,

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再根据深度和法线的突变检测边缘
then detect edges from jumps in depth and normals

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画出手绘一样的描边
to draw hand-inked outlines.

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第四种，油画。桑原滤波会在每个像素周围
Fourth: oil painting. A Kuwahara filter finds the smoothest

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找出颜色最平稳的区域
region around each pixel,

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细节被抹成一块块笔触，再叠上画布的纹理
smearing details into brush strokes over a canvas texture.

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第五种，水墨。只保留明暗和远近，远山淡，近山浓
Fifth: ink wash. Keep only value and distance — far hills pale, near hills dark,

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边缘扰动成毛笔的飞白，海面留白
edges broken into dry-brush strokes, the sea left blank,

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太阳化作一轮朱砂红日
and the sun a cinnabar-red disc.

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同一套几何，同一套光照
Same geometry, same lighting —

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只是最后几行着色代码不同，画面就完全变了样
only the last few lines of shading differ, and the picture changes completely.

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你最喜欢哪一种？评论区告诉我
Which one is your favorite? Tell me in the comments.