// Author: Sol Sarratea @solquemal
//Title: BONUS - Raymarching
precision mediump float;
uniform float u_time;
uniform vec2 u_resolution;
vec2 uv(){
/* Devuelve las posiciones del canvas en rango [-1.,1.]x[-1.,1.] */
vec2 pos = gl_FragCoord.xy/u_resolution;
pos.x *= u_resolution.y/u_resolution.x;
pos = pos *2.-1.;
return pos;
}
void main() {
vec3 pos = vec3(uv(),1.);
vec3 cam = vec3(0.,3., -9.);
cam.z +=u_time;
vec3 rayo = normalize(pos);
float marcha = 0.;
for(int i=0; i < 32; ++i){
vec3 p = cam + rayo * marcha;
float d = length(sin(p)+cos(p.yzx))-.5;
marcha += d;
if (marcha > 50. || d < 0.01) break;
}
vec3 color;
color += pow(0.908,marcha);
gl_FragColor = vec4(color, 1.);
}
