#define AA 2
const float PI = 3.1415926; vec3 hsv(float h, float s, float v){ vec4 t = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0); vec3 p = abs(fract(vec3(h) + t.xyz) * 6.0 - vec3(t.w)); return v * mix(vec3(t.x), clamp(p - vec3(t.x), 0.0, 1.0), s); } mat2 rotate(in float r){ return mat2(cos(r), -sin(r), sin(r), cos(r)); } float usin(in float x){ return 0.5+0.5*sin(x); } float gray(in vec3 color){ return dot(color, vec3(0.299, 0.587, 0.114)); } float sdSphere(in vec3 p, in float r){ return length(p) - r; } float sdBox(in vec3 p, in vec3 b){ vec3 d = abs(p) - b; return min(max(d.x, max(d.y, d.z)), 0.) + length(max(d, 0.)); } vec3 opRep(in vec3 p, in vec3 c){ return mod(p, c) - 0.5*c; } float sdObj(in vec3 p){ vec3 q = p; q.xy *= rotate(q.z*PI*0.05+iTime*0.1); q = opRep(q, vec3(5.0)); q.xy *= rotate(q.z*PI+iTime); return sdBox(q, vec3(2.5, 0.1, 2.5)); } vec2 map(in vec3 p){ vec2 res = vec2(0.0); vec3 q = p; res = vec2(sdObj(q), 1.); return res; } vec3 calcNormal(in vec3 p){ vec2 e = vec2(1.0, -1.0) * 0.00001; return normalize(vec3( e.xyy*map(p+e.xyy).x + e.yxy*map(p+e.yxy).x + e.yyx*map(p+e.yyx).x + e.xxx*map(p+e.xxx).x )); } mat3 lookAt(in vec3 eye, in vec3 tar, in float r){ vec3 cw = normalize(tar - eye); vec3 cp = vec3(sin(r), cos(r), 0.); vec3 cu = normalize(cross(cp, cw)); vec3 cv = normalize(cross(cw, cu)); return mat3(cu,cv,cw); } vec2 castRay(in vec3 ro, in vec3 rd){ float minD=0.0, maxD = 30.0; float d=minD, m=0.0; for(int i=0;i<32;i++){ vec3 pos = ro + rd*d; vec2 tmp = map(pos); if(tmp.x<0.0000001 || maxD<tmp.x) break; d += tmp.x*0.6; m = tmp.y; } if(maxD<d) m = -1.0; return vec2(d, m); } vec3 render(in vec3 ro, in vec3 rd){ vec2 res = castRay(ro, rd); float d = res.x; float m = res.y; vec3 pos = ro + rd * d; vec3 nor = calcNormal(pos); vec3 lightDir = normalize(vec3(cos(iTime), 1., sin(iTime))); vec3 color = vec3(0.); if(m==1.){ color += clamp(dot(lightDir, nor), 0., 1.); float g = gray(color); color = hsv(0.5+0.1*sin(iTime*0.5)+g*(0.4+usin(iTime*0.001)), 1.0, 1.0); color += usin(d+iTime*20.0); color *= exp(-0.03*d); }else { color = vec3(0.0); } return color; } void mainImage( out vec4 fragColor, in vec2 fragCoord ) { vec3 eye = vec3(0., 0., iTime); vec3 tar = eye-vec3(0.1*sin(iTime*1.2+sin(iTime*0.5)), 0.1*sin(iTime*.9+sin(iTime*1.3)), 1.0); vec3 color = vec3(0.); for(int i=0;i<AA;i++){ for(int j=0;j<AA;j++){ vec2 p = (fragCoord.xy * 2.0 - iResolution.xy) / min(iResolution.x, iResolution.y); p += vec2(float(i), float(j))/iResolution.xy; vec3 dir = normalize(lookAt(eye, tar, iTime*0.4+0.2*sin(iTime*0.8)) * vec3(p, 1.0)); dir = normalize(vec3(dir.xy, sqrt(max(dir.z*dir.z - dot(dir.xy, dir.xy)*0.2, 0.)))); color += render(eye, dir); } } color /= float(AA*AA); fragColor = vec4(color,1.0); }