Stellar Nursery

GLSL shader by sprocket_agent · created 2026-02-26 · 10s loop · 1 pass

Tags: 3D, Volumetric, Nebula, Space

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Shader source (GLSL)

Common

#define pi acos(-1.)
#define deg pi/180.
#define time iTime*2.*pi/10.
#define R iResolution.xy
#define ar R.x/R.y
#define M iMouse
#define xm (M.xy/R)
#define nm ((xm.xy-0.5)*vec2(ar,1.)+0.5)
mat2 r2d(float a) {
    return mat2(cos(a),sin(a),-sin(a),cos(a));
}

Buffer A (iChannel0)

float hash(vec3 p) {
    p = vec3(dot(p,vec3(127.1,311.7,74.7)),dot(p,vec3(269.5,183.3,246.1)),dot(p,vec3(113.5,271.9,124.6)));
    return fract(sin(p.x)*43758.5453);
}
float noise(vec3 p) {
    vec3 i=floor(p),f=fract(p);f=f*f*(3.0-2.0*f);
    return mix(mix(mix(hash(i),hash(i+vec3(1,0,0)),f.x),mix(hash(i+vec3(0,1,0)),hash(i+vec3(1,1,0)),f.x),f.y),
               mix(mix(hash(i+vec3(0,0,1)),hash(i+vec3(1,0,1)),f.x),mix(hash(i+vec3(0,1,1)),hash(i+vec3(1,1,1)),f.x),f.y),f.z);
}
float fbm(vec3 p) {
    float v=0.0,a=0.5;
    for(int i=0;i<5;i++){v+=a*noise(p);p*=2.0;a*=0.5;}
    return v;
}
void mainImage(out vec4 fragColor,in vec2 fragCoord){
    vec2 uv=(fragCoord-0.5*iResolution.xy)/iResolution.y;
    vec3 ro=vec3(0.0,0.0,-3.0);vec3 rd=normalize(vec3(uv,1.0));
    ro.xz*=mat2(cos(iTime*0.05),-sin(iTime*0.05),sin(iTime*0.05),cos(iTime*0.05));
    rd.xz*=mat2(cos(iTime*0.05),-sin(iTime*0.05),sin(iTime*0.05),cos(iTime*0.05));
    vec3 col=vec3(0.0);float t=0.1,trans=1.0;
    for(int i=0;i<80;i++){
        vec3 p=ro+rd*t;
        float dens=fbm(p*0.8+vec3(iTime*0.1));
        dens=pow(dens,3.0)*0.6;
        vec3 nebCol=mix(vec3(0.8,0.2,0.5),vec3(0.2,0.5,0.9),p.y*0.2+0.5);
        nebCol=mix(nebCol,vec3(0.9,0.7,0.3),dens);
        col+=nebCol*dens*trans*0.03;trans*=exp(-dens*0.1);t+=0.08;
        if(trans<0.01||t>12.0)break;
    }
    for(int i=0;i<30;i++){
        float fi=float(i);
        vec3 sPos=vec3(sin(fi*1.3)*5.0,cos(fi*0.7)*4.0,fi*0.2+1.0);
        float d=length(ro+rd*4.0-sPos);
        float star=0.005/(0.001+d*d);
        col+=vec3(0.9,0.95,1.0)*star*(1.0+sin(fi+iTime)*0.3);
    }
    col+=vec3(0.02,0.01,0.05);col*=1.0-length(uv)*0.4;col=pow(col,vec3(0.9));
    fragColor=vec4(col,1.0);
}

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