30⟡241 • Pouya Kary's Archive

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ANNO·TRICESIMO·DIE·DVCENTESIMO·QVADRAGESIMO·PRIMO·VITÆ·POVYA

$One of the shaders so that you get what I mean by the algorithm: #ifdef GL_ES precision mediump float; #endif uniform vec2 u_resolution; uniform vec2 u_mouse; uniform float u_time; vec3 mod289(vec3 x) { return x - floor(x * (1.0 / 289.0)) * 289.0; } vec2 mod289(vec2 x) { return x - floor(x * (1.0 / 289.0)) * 289.0; } vec3 permute(vec3 x) { return mod289(((x*34.0)+1.0)*x); } float snoise(vec2 v) { const vec4 C = vec4(0.211324865405187, // (3.0-sqrt(3.0))/6.0 0.366025403784439, // 0.5*(sqrt(3.0)-1.0) -0.577350269189626, // -1.0 + 2.0 * C.x 0.024390243902439); // 1.0 / 41.0 vec2 i = floor(v + dot(v, C.yy) ); vec2 x0 = v - i + dot(i, C.xx); vec2 i1; i1 = (x0.x > x0.y) ? vec2(1.0, 0.0) : vec2(0.0, 1.0); vec4 x12 = x0.xyxy + C.xxzz; x12.xy -= i1; i = mod289(i); // Avoid truncation effects in permutation vec3 p = permute( permute( i.y + vec3(0.0, i1.y, 1.0 )) + i.x + vec3(0.0, i1.x, 1.0 )); vec3 m = max(0.5 - vec3(dot(x0,x0), dot(x12.xy,x12.xy), dot(x12.zw,x12.zw)), 0.0); m = m*m ; m = m*m ; vec3 x = 2.0 * fract(p * C.www) - 1.0; vec3 h = abs(x) - 0.5; vec3 ox = floor(x + 0.5); vec3 a0 = x - ox; m *= 1.79284291400159 - 0.85373472095314 * ( a0*a0 + h*h ); vec3 g; g.x = a0.x * x0.x + h.x * x0.y; g.yz = a0.yz * x12.xz + h.yz * x12.yw; return 130.0 * dot(m, g); } void main() { vec2 st = gl_FragCoord.xy/u_resolution.xy; st.x *= u_resolution.x/u_resolution.y; vec3 color = vec3(0.0); vec2 pos = vec2(st*3.); vec2 pos2 = vec2(st*2.); float DF = 0.0; float DF2 = 0.0; // Add a random position float a = 0.0; float a2 = 0.0; vec2 vel = vec2(u_time*.1); vec2 vel2 = vec2(u_time*1.5); DF += snoise(pos+vel)*.25+.25; DF2 += snoise(pos+vel)*.4+.2; // Add a random position a = snoise(pos*vec2(cos(u_time*0.3),sin(u_time*0.1))*0.1)*1.950; a2 = snoise(pos2*vec2(sin(u_time*0.656),cos(u_time*0.3))*0.1)*2.030; vel = vec2(cos(a),sin(a)); vel2 = vec2(sin(a2),cos(a2)); DF += snoise(pos+vel)*-0.238+0.122; DF2 += snoise(pos2+vel2)*0.458+-0.286; color = vec3(smoothstep(2.036,0.102,fract(1.0 - DF)), smoothstep(-0.060,0.422,fract(DF2)), smoothstep(0.668,0.494,fract(DF2)) ); vec3 color2 = vec3(smoothstep(-2.076,-1.858,fract(1.0 - DF2)), smoothstep(-0.420,-0.458,fract(DF)), smoothstep(0.924,2.126,fract(DF)) ); gl_FragColor = vec4(mix(1.0-color, color2, 0.5), 1.0); }$

Trying to comeup with a nice shader for the Bret Victor’s Quotes Screensaver, I toyed with the simplex based shader I had. I then thought about having two layers moving in different ways and so I made it, and then toyed with the coloring algorithm. I ended up with a formula that was so strange, and the colors I ended up finding were really amazing. You can see some of them.