80 lines
2.0 KiB
GLSL
80 lines
2.0 KiB
GLSL
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// Inspired from: https://www.shadertoy.com/view/3dBGWG
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#ifdef GL_ES
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precision mediump float;
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#endif
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uniform float time;
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uniform vec2 resolution;
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vec3 rotate(vec3 p,vec3 axis,float theta)
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{
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vec3 v = cross(p, axis), u = cross(v, axis);
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return u * cos(theta) + v * sin(theta) + axis * dot(p, axis);
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}
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vec2 rotate(vec2 p, float theta)
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{
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return p * cos(theta) + vec2(-p.y, p.x) * sin(theta);
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}
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float deLineBox(vec3 p)
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{
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p=mod(p,4.0)-2.0;
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float de = 1e5;
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for(float j=1.0; j<4.0;j++)
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{
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p = abs(p)-1.0;
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for(int i=0; i<3;i++)
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{
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vec3 q =p;
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q[i]=max(0.0,q[i]);
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de= min(de,length(q)-0.03*j);
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}
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p*=2.0;
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}
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return de;
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}
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float dstepf = 0.0;
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float map(vec3 p)
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{
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dstepf += 0.003;
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float t = floor(time/5.5)*3.5 + min(8.0, mod(time,10.0));
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p = rotate(p,normalize(vec3(rotate(vec2(1,2),sin(t/3.)),3)),t*0.35);
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return deLineBox(p);
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}
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void main()
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{
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vec2 uv = (gl_FragCoord.xy*2.0-resolution.xy)/resolution.y;
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vec3 ro = vec3(3.5)*sin(time*0.02+ 0.2*sin(time*0.1));
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vec3 rd0 = normalize(vec3(uv, -1.0));
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vec3 rd1 = normalize(vec3(uv, (1.0-dot(uv, uv)*0.5)*0.5));
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vec3 rd = mix(rd0, rd1, step(6.0,mod(time,12.0)));
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vec3 col = vec3(0);
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float t=0.1, layers=0.0, d, aD;
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float thD = 0.03;
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for(float i=0.; i<80.; i++)
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{
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if(layers>10. || col.x > 1.0 || t>6.0) break;
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vec3 p = ro + rd*t;
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d = map(p);
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aD = (thD-abs(d))/thD;
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if(aD>0.)
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{
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col += aD*aD*(3.0-2.0*aD)/(1.0 + t*t*0.5)*0.15;
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layers++;
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}
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t += max(d, thD*1.5) * dstepf;
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}
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col = mix(col, vec3(min(col.x*1.5, 1.), pow(col.x, 2.5), pow(col.x, 12.)),
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dot(sin(rd.yzx*8. + sin(rd.zxy*8.)), vec3(.1666))+0.4);
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col = mix(col, vec3(col.x*col.x*.85, col.x, col.x*col.x*0.3),
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dot(sin(rd.yzx*4. + sin(rd.zxy*4.)), vec3(.1666))+0.25);
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gl_FragColor = vec4( clamp(col, 0., 1.), 1.0 );
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}
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