恒星噪音

Posted 2020-10-25 toomanywaytobe

　　绘制的图像

　　

 

　　源码

　　

 1 void main()
 2 {    
 3     vec2 uv = TexCoords;
 4      // 换算到[(-.5, -.5), (.5, .5)]  
 5     vec2 p = -0.5 + uv;  
 6     
 7     vec2 uvTemp = vec2(atan(p.x,p.y)/6.2832 + 0.5, length(p)* 0.4);  
 8     //uvTemp = vec2(atan(p.x,p.y)/6.2832, length(p));
 9     //uvTemp = vec2(atan(p.x, p.y) * 5.0, length(p) * 0.4);
10     float uv1 = atan(p.x, p.y) / 6.2832;
11     uvTemp = vec2(uv1, uv1);
12 
13     float color = 1.0 - length(p);
14     color = 0.1;
15     //color =1.0 - length(p);
16     //color = 3.0 - 3.0 * length(p);
17  
18    for(int i = 1; i <= 7; i++)  
19    {  
20       float power = pow(2.0, float(i)); 
21       color += (1.0 / power) * noise_fractal(uv * power);// + noise_fractal(vec2(time * power));
22       //noise_sum_abs(uv);  noise_fractal(uv * power); noise ; value_noise
23    }  
24     
25     //FragColor = vec4( color, pow(max(color,0.),2.)*0.4, pow(max(color,0.),3.)*0.15 , 1.0);  
26     FragColor = vec4(color, color * 0.4, color * 0.15, 1.0);
27      
28 }

　　把各个函数在网格上绘制出来就一目了然了

　　关于噪音过程，推荐看看这篇 http://blog.csdn.net/candycat1992/article/details/50346469