平滑低倍频程柏林噪声

发布于 2024-12-29 03:26:03 字数 1178 浏览 2 评论 0原文

我正在尝试使用找到的噪声函数在片段着色器中创建超级简单的 Perlin 噪声云这里。

在低八度时，我的输出是，因为缺乏更好的词，“blobby”。我只是想平滑这些斑点区域并拥有平滑的噪音，但比仅仅一个八度音阶更详细一点。

片段着色器：

#ifdef GL_ES
precision mediump float;
#endif

uniform float time;
uniform vec2 resolution;

// Noise related functions go here ..

float surface3 ( vec3 coord ) {
        float frequency = 4.0;
        float n = 0.0;  

        n += 1.0    * abs( cnoise( coord * frequency ) );
        n += 0.5    * abs( cnoise( coord * frequency * 2.0 ) );
        n += 0.25   * abs( cnoise( coord * frequency * 4.0 ) );

        return n;
}

void main( void ) {
        vec2 position = gl_FragCoord.xy / resolution.xy;

        float n = surface3(vec3(position, time * 0.1));

        gl_FragColor = vec4(n, n, n, 1.0);
}

实例：
http://glsl.heroku.com/e#1413.0

左边是我现在拥有的。我怎样才能实现与正确图像更一致的东西？

原文

I'm trying to create super simple Perlin noise clouds in a fragment shader, using the Noise function found here.

At low octaves my output is, for want of a better word, 'blobby'. I'd simply like to smooth out these blobby areas and have smooth noise but have it a little more detailed than just one octave.

Fragment shader:

#ifdef GL_ES
precision mediump float;
#endif

uniform float time;
uniform vec2 resolution;

// Noise related functions go here ..

float surface3 ( vec3 coord ) {
        float frequency = 4.0;
        float n = 0.0;  

        n += 1.0    * abs( cnoise( coord * frequency ) );
        n += 0.5    * abs( cnoise( coord * frequency * 2.0 ) );
        n += 0.25   * abs( cnoise( coord * frequency * 4.0 ) );

        return n;
}

void main( void ) {
        vec2 position = gl_FragCoord.xy / resolution.xy;

        float n = surface3(vec3(position, time * 0.1));

        gl_FragColor = vec4(n, n, n, 1.0);
}

Live example:
http://glsl.heroku.com/e#1413.0