webgl noise examples
A free shader demo — play it in your browser, no install. examples about noise. 梯度噪声是通过多个随机梯度相互影响计算得到，通过梯度向量的方向与片元的位置计算噪声值。这里以2d举例，主要分为四步：1. 网格生成；2. 网格随机梯度生成；3. 梯度贡献值计算；4. 平滑插值 如图，网格内的片元点P的四个顶点距离向量为a1, a2, a3, a4，此时将距离向量与梯度向量g1, g2, g3, g4进行点积运算：c[i] = a[i] · g[i]； 最后一步，将F1映射为当前像素点的颜色值，可以是gl_FragColor = vec4(vec3(pow(noise(uv), 2.)), 1.0);。…
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Open the live demo Source on GitHubFrom the README
梯度噪声是通过多个随机梯度相互影响计算得到，通过梯度向量的方向与片元的位置计算噪声值。这里以2d举例，主要分为四步：1. 网格生成；2. 网格随机梯度生成；3. 梯度贡献值计算；4. 平滑插值
如图，网格内的片元点P的四个顶点距离向量为a1, a2, a3, a4，此时将距离向量与梯度向量g1, g2, g3, g4进行点积运算：c[i] = a[i] · g[i]；
最后一步，将F1映射为当前像素点的颜色值，可以是gl_FragColor = vec4(vec3(pow(noise(uv), 2.)), 1.0);。 不仅如此，我们还可以取特征点v到点p第二近的距离F2，通过F2 - F1，得到类似泰森多变形的纹理，如上图最右侧。
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