shadermeh/shaders/fractal.frag

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vec3 palette(float d){
return mix(vec3(0.2,0.7,0.9),vec3(1.,0.,1.),d);
}
vec2 rotate(vec2 p,float a){
float c = cos(a);
float s = sin(a);
return p*mat2(c,s,-s,c);
}
float map(vec3 p){
for( int i = 0; i<8; ++i){
float t = iTime*0.2;
p.xz =rotate(p.xz,t);
p.xy =rotate(p.xy,t*1.89);
p.xz = abs(p.xz);
p.xz-=.5;
}
return dot(sign(p),p)/5.;
}
vec4 rm (vec3 ro, vec3 rd){
float t = 0.;
vec3 col = vec3(0.);
float d;
for(float i =0.; i<64.; i++){
vec3 p = ro + rd*t;
d = map(p)*.5;
if(d<0.02){
break;
}
if(d>100.){
break;
}
//col+=vec3(0.6,0.8,0.8)/(400.*(d));
col+=palette(length(p)*.1)/(400.*(d));
t+=d;
}
return vec4(col,1./(d*100.));
}
void mainImage( out vec4 fragColor, in vec2 fragCoord )
{
vec2 uv = (fragCoord-(iResolution.xy/2.))/iResolution.x;
vec3 ro = vec3(0.,0.,-50.);
ro.xz = rotate(ro.xz,iTime);
vec3 cf = normalize(-ro);
vec3 cs = normalize(cross(cf,vec3(0.,1.,0.)));
vec3 cu = normalize(cross(cf,cs));
vec3 uuv = ro+cf*3. + uv.x*cs + uv.y*cu;
vec3 rd = normalize(uuv-ro);
vec4 col = rm(ro,rd);
fragColor = col;
}
/** SHADERDATA
{
"title": "fractal pyramid",
"description": "",
"model": "car"
}
*/