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blob4.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="description" content="Meta blobs - Blob #4. Made by Jose Blanco Perales.">
<meta name="author" content="Jose Blanco Perales">
<meta name="keywords" content="creativeCoding, javascript, glsl, motionDesign">
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:title" content="Meta blobs - Blob #4">
<meta name="twitter:description" content="Meta blobs - Blob #4. Made by Jose Blanco Perales.">
<meta name="twitter:creator" content="@blancoperales">
<meta name="twitter:site" content="@blancoperales">
<meta name="twitter:image" content="https://metablobs.joseblancoperales.com/imgs/big/blob4.png">
<link rel="icon" href="favicon.ico" type="image/x-icon" />
<title>Meta blobs - Blob #4</title>
<link rel="stylesheet" href="blob.css" type="text/css">
</head>
<body>
<div id="panel">
<p>#4</p>
<a href="index.html">
<svg width="35" height="35" version="1.1" viewBox="0 0 13.229166 13.229167" xmlns="http://www.w3.org/2000/svg"><g transform="translate(0 -283.77)"><path transform="matrix(.26458 0 0 .26458 0 283.77)" d="m25 5l-20 15v25h5v-23l15-11 15 11v18h-15v-10h5v-5h-10v15h-5v5h25 5v-25l-20-15z" style="paint-order:normal"/></g></svg>
</a>
<a href="https://github.com/jblanper/metablobs" target="_blank">
<svg width="35" height="35" version="1.1" viewBox="0 0 13.229166 13.229167" xmlns="http://www.w3.org/2000/svg"><g transform="translate(0 -283.77)"><path d="m6.6208 286.68-1.2972 7.4083h1.3656l1.2968-7.4083z" style="paint-order:normal"/><path d="m4.433 287.69c-1.3008 0.75108-2.6017 1.502-3.9026 2.2531v0.58497c-0.013266 0.11065 0.018061 0.24834 0.004134 0.30954 1.2995 0.75025 2.599 1.5003 3.8985 2.2505v-1.4769c-0.70558-0.40737-1.4111-0.81477-2.1167-1.2222 0.70558-0.40737 1.4111-0.81478 2.1167-1.2221z" style="paint-order:normal"/><path d="m8.794 287.69c1.3008 0.75108 2.6017 1.502 3.9026 2.2531v0.58497c0.01327 0.11065-0.01806 0.24834-0.0041 0.30954-1.2995 0.75025-2.599 1.5003-3.8985 2.2505v-1.4769c0.70558-0.40737 1.4111-0.81477 2.1167-1.2222-0.70558-0.40737-1.4111-0.81478-2.1167-1.2221z" style="paint-order:normal"/></g></svg>
</a>
</div>
<canvas></canvas>
<script id="vs" type="notjs">
attribute vec4 position;
void main() {
gl_Position = position;
}
</script>
<script id="fs" type="notjs">
//precision mediump float;
precision highp float;
uniform float time;
uniform vec2 resolution;
#define MAX_STEPS 100
#define MAX_DIST 20.
#define EPSILON .001//.0001 //.01 o .0001
mat2 rotate(float a) {
return mat2(cos(a), -sin(a), sin(a), cos(a));
}
float smin( float a, float b, float k ) {
// http://www.iquilezles.org/www/articles/smin/smin.htm
float h = max( k-abs(a-b), 0.0 )/k;
return min( a, b ) - h*h*h*k*(1.0/6.0);
}
float sphereSDF (vec3 p, float r) {
return length(p) - r;
}
float displacement(vec3 p, float n) {
return sin(p.x * n) * sin(p.y * n) * sin(p.z * n);
}
float sceneSDF (vec3 p) {
float s1 = sphereSDF(p - vec3(-.8 * sin(time * .1) * .2, .3, -.10 * cos(time * .1) * .5), .125 + sin(cos(dot(p, vec3(p.y)) * 2.2 - time * .3) * 18. + time * .02) * .5 + .5);
float s3 = sphereSDF(p - vec3(-.8 * sin(time * .01) * .2, .5, -.10 * cos(time * .1) * .5) * sin(length(p * sin(time * .1)) * 9. + cos(time * .1)), .8);
return smin(s1 * .2, s3 * 1.5 + displacement(p - cos(atan(p.y, p.z) - time * .01) * .5 + .5, 2.5), 2.5);
}
vec3 getNormal (vec3 p) {
float d = sceneSDF(p);
vec2 e = vec2(.01, 0.);
return normalize(d - vec3(
sceneSDF(p - e.xyy),
sceneSDF(p - e.yxy),
sceneSDF(p - e.yyx)));
}
float raymarch (vec3 ro, vec3 rd) {
float depth = 0.;
for (int i = 0; i < MAX_STEPS; i++) {
float dist = sceneSDF(ro + rd * depth);
if (dist < EPSILON) return depth;
depth += dist;
if (depth >= MAX_DIST) return 0.;
}
return 0.;
}
float getLight (vec3 lightPos, vec3 p) {
vec3 light = normalize(lightPos - p);
vec3 normal = getNormal(p);
float diff = clamp(dot(normal, light), 0., 1.);
return diff;
}
vec3 getRayDir (vec2 uv, vec3 rayOrigin, vec3 lookat, float zoom) {
// https://www.youtube.com/watch?v=PBxuVlp7nuM
vec3 forward = normalize(lookat - rayOrigin);
vec3 right = normalize(cross(vec3(0., 1., 0.), forward));
vec3 up = cross(forward, right);
vec3 center = rayOrigin + forward * zoom;
vec3 intersection = center + uv.x * right + uv.y * up;
return normalize(intersection - rayOrigin);
}
void main (void) {
vec2 uv = (gl_FragCoord.xy / resolution.xy) * 2.0 - 1.0;
uv.x *= resolution.x / resolution.y;
// camera
vec3 ro = vec3(-.3, 1., 8.);
ro.xz *= rotate(time * .2);
vec3 rd = getRayDir(uv, ro, vec3(-.1), 3.1);
vec3 color = vec3(0.);
float d = raymarch(ro, rd);
vec3 p = ro + rd * d;
if (d > 0.) {
vec3 lightPos1 = vec3(4. * sin(time * .5), 4., 6. * cos(time * .5));
vec3 lightPos2 = vec3(-6., -3. * sin(time * .5), -1. * cos(time * .5));
float diff = getLight(lightPos1 * d, p);
color += diff * 1.1;
diff = getLight(lightPos2 * d, p);
color += diff * .4;
color -= d * .002;
}
gl_FragColor = vec4(color, 1.);
}
</script>
<script src="twgl.min.js"></script>
<script>
const gl = document.querySelector("canvas").getContext("webgl");
const programInfo = twgl.createProgramInfo(gl, ["vs", "fs"]);
const arrays = {
position: [-1, -1, 0, 1, -1, 0, -1, 1, 0, -1, 1, 0, 1, -1, 0, 1, 1, 0],
};
const bufferInfo = twgl.createBufferInfoFromArrays(gl, arrays);
function render(time) {
twgl.resizeCanvasToDisplaySize(gl.canvas);
gl.viewport(0, 0, gl.canvas.width, gl.canvas.height);
const uniforms = {
time: time * 0.001,
resolution: [gl.canvas.width, gl.canvas.height],
};
gl.useProgram(programInfo.program);
twgl.setBuffersAndAttributes(gl, programInfo, bufferInfo);
twgl.setUniforms(programInfo, uniforms);
twgl.drawBufferInfo(gl, bufferInfo);
requestAnimationFrame(render);
}
requestAnimationFrame(render);
</script>
</body>
</html>