Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URLs added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using its URL and the proper URL extension.

+ add another resource

JavaScript

Babel includes JSX processing.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

Behavior

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML

              
                <!-- this pen was built and maintained in https://github.com/callumacrae/sketchbook/blob/master/src/views/ParticlePhotoWebgl.vue -->

<p class="loading">loading…</p>

<div class="canvas-container" style="display: none">
  <canvas
          ref="canvas"
          @click="status = status === 'playing' ? 'paused' : 'playing'"
          @dragenter.prevent
          @dragleave.prevent
          @dragover.prevent
          @drop.prevent="handleDrop"
          ></canvas>
  <GlobalEvents target="window" @resize="setSize" />

  <div class="help-container" v-show="showHelp || showIosWarning">
    <div class="help" v-show="showIosWarning">
      <h2 style="color: red">WARNING</h2>
      <p>
        Due to a bug in how iOS handles webgl instancing, this animation
        performs incredibly poorly on iOS—to the point where it doesn't really
        work at all. On my phone, it runs at 0.0075 fps and makes my phone
        heat up to the temperature of the sun.
      </p>

      <p>
        I'd recommend trying this on desktop (it also just looks better), but
        if you really want to see what happens on iOS, you can
        <a
           href
           @click.prevent="
                           showIosWarning = false;
                           status = 'playing';
                           "
           >
          proceed anyway</a
          >.
      </p>
    </div>
    <div class="help" v-show="showHelp">
      <h2>Instructions</h2>

      <p>
        This experiment visualises images as collections of animated coloured
        particles.
      </p>

      <p>
        In addition to providing a few images (selectable on the configuration
        in the top right of the screen), it also allows you to upload your own
        by dragging and dropping them onto the canvas.
      </p>

      <p>
        Through a bit of experimentation, I've found the following makes the
        best images:
      </p>

      <ul>
        <li>
          Lower resolution images or blurred images work better as it prevents
          the particles from changing size and colour too quickly as they move
          about. Most of the demo images are lower than 500px wide.
        </li>

        <li>
          Images with lots of contrast between lighter and darker areas make
          more effective graphics. Similarly, images where the details are on
          the lighter parts of the images and the backgrounds are dark also
          look better.
        </li>

        <li>
          Some images, especially images with finer details, look better with
          a high number of smaller points (adjust pointSizeMultiplier), while
          others look better with a low number of larger points.
        </li>
      </ul>

      <p>
        To export high quality videos from this you'll need to
        <a href="https://github.com/callumacrae/sketchbook">clone the repo</a>
        and look for the <code>this.record</code> call in
        ParticlePhotoWebgl.vue (or ask me for help on Twitter!)
      </p>
    </div>
  </div>

  <p class="status" v-show="status === 'paused' && !showIosWarning" @click="status = 'playing'">
    paused, click to resume
  </p>

  <a
     v-if="!showIosWarning"
     class="toggle-help-link"
     href
     @click.prevent="showHelp = !showHelp"
     >
    toggle help
  </a>
</div>

<script type="nojs" id="vs">
precision mediump float;

//
// Description : Array and textureless GLSL 2D simplex noise function.
//      Author : Ian McEwan, Ashima Arts.
//  Maintainer : stegu
//     Lastmod : 20110822 (ijm)
//     License : Copyright (C) 2011 Ashima Arts. All rights reserved.
//               Distributed under the MIT License. See LICENSE file.
//               https://github.com/ashima/webgl-noise
//               https://github.com/stegu/webgl-noise
// 

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)+10.0)*x);
}

float noise2d(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
// First corner
  vec2 i  = floor(v + dot(v, C.yy) );
  vec2 x0 = v -   i + dot(i, C.xx);

// Other corners
  vec2 i1;
  //i1.x = step( x0.y, x0.x ); // x0.x > x0.y ? 1.0 : 0.0
  //i1.y = 1.0 - i1.x;
  i1 = (x0.x > x0.y) ? vec2(1.0, 0.0) : vec2(0.0, 1.0);
  // x0 = x0 - 0.0 + 0.0 * C.xx ;
  // x1 = x0 - i1 + 1.0 * C.xx ;
  // x2 = x0 - 1.0 + 2.0 * C.xx ;
  vec4 x12 = x0.xyxy + C.xxzz;
  x12.xy -= i1;

// Permutations
  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 ;

// Gradients: 41 points uniformly over a line, mapped onto a diamond.
// The ring size 17*17 = 289 is close to a multiple of 41 (41*7 = 287)

  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;

// Normalise gradients implicitly by scaling m
// Approximation of: m *= inversesqrt( a0*a0 + h*h );
  m *= 1.79284291400159 - 0.85373472095314 * ( a0*a0 + h*h );

// Compute final noise value at P
  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);
}

attribute float a_x;
attribute float a_initial_offset;
attribute float a_speed;

uniform float u_time;
uniform sampler2D u_image_texture;
uniform float u_width;
uniform float u_x_in_noise_multiplier;
uniform float u_x_out_noise_multiplier;
uniform float u_y_in_noise_multiplier;
uniform float u_y_out_noise_multiplier;
uniform float u_point_size_multiplier;

varying vec2 v_position;
varying float v_initial_offset;

void main() {
  vec2 position = vec2(2.0 * a_x - 1.0, 0.0);

  float offset_y = mod(a_initial_offset + 1.0 + a_speed * u_time / 500000.0, 2.0) - 1.0;

  position.x += noise2d(
      vec2(a_x * u_x_in_noise_multiplier + 123.4, offset_y * 0.5 + u_time / 100000.0)
    ) * u_x_out_noise_multiplier;
  position.y += offset_y + noise2d(
      vec2(a_x * u_y_in_noise_multiplier, u_time / 10000.0 + 100.0)
    ) * u_y_out_noise_multiplier;

  position.y *= 1.1;

  v_position = position;
  v_initial_offset = a_initial_offset;

  gl_Position = vec4(position, 0.0, 1.0);
  gl_PointSize = u_width / 660.0 * u_point_size_multiplier;
}
</script>

<script type="nojs" id="fs">
precision mediump float;

uniform sampler2D u_image_texture;
uniform float u_radius_val_exponent;
uniform float u_alpha_val_exponent;
uniform float u_alpha_val_multiplier;
uniform bool u_color;
uniform float u_twinkle_frequency;
uniform float u_twinkle_intensity;
uniform float u_twinkle_factor;

varying vec2 v_position;
varying float v_initial_offset;

void main() {
  vec2 position = v_position;
  position.y *= -1.0;

  vec4 texture_color = texture2D(u_image_texture, (position + 1.0) / 2.0);

  // http://www.johndcook.com/blog/2009/08/24/algorithms-convert-color-grayscale/
  // The alpha multiplication stops random transparent white pixels from ruining everything
  float intensity = (0.21 * texture_color.r + 0.71 * texture_color.g + 0.07 * texture_color.b) * texture_color.a;

  float radius_val = pow(intensity, u_radius_val_exponent);
  float alpha_val = pow(intensity, u_alpha_val_exponent) * u_alpha_val_multiplier;

  float twinkle_y_normalised = abs(mod((position.y - v_initial_offset * 123.0) * 100.0, u_twinkle_frequency * 2.0) - u_twinkle_frequency);
  float twinkle_value = 1.0 - u_twinkle_factor + u_twinkle_factor * smoothstep(
      u_twinkle_frequency * (1.0 - 1.0 / u_twinkle_intensity / u_twinkle_frequency * 5.0),
      u_twinkle_frequency,
      twinkle_y_normalised
    );

  vec2 pc = (gl_PointCoord - 0.5) * 2.0;
  float dist = sqrt(pc.x * pc.x + pc.y * pc.y);
  float alpha = alpha_val * smoothstep(radius_val, radius_val - 0.1, dist) * twinkle_value;

  gl_FragColor = vec4(u_color ? texture_color.rgb : vec3(1.0), alpha);
}

</script>
              
            
!

CSS

              
                body {
  margin: 0;
  background-color: black;
}

.loading {
  color: white;
}

.canvas-container {
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;

  font-family: sans-serif;

  background-color: black;
}

canvas {
  max-height: 100vh;
  max-width: 100vw;
}

.toggle-help-link {
  position: absolute;
  bottom: 10px;
  right: 10px;

  font-size: 12px;
  text-decoration: none;

  color: lightgrey;
}

.status {
  position: absolute;
  bottom: 10px;
  left: 10px;

  font-size: 12px;

  color: lightgrey;
}

.help-container {
  position: fixed;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;

  display: flex;
  align-items: center;
  justify-content: center;

  background-color: rgba(0, 0, 0, 0.4);
  color: white;
  backdrop-filter: blur(3px);
}

.help-container .help {
  width: 90%;
  max-width: 500px;
}

.help li {
  margin-bottom: 1em;
}

.help a {
  color: inherit;
}
              
            
!

JS

              
                import * as twgl from 'https://cdn.skypack.dev/[email protected]/dist/4.x/twgl-full.module';
import * as dat from 'https://cdn.skypack.dev/dat.gui';
import Stats from 'https://cdn.skypack.dev/stats.js';

import * as random from 'https://cdn.skypack.dev/@callumacrae/[email protected]/built/random';

// This is mostly for displaying warnings
const isAndroid = /android/i.test(navigator.userAgent);
const isIos = /iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream;
const isMobile = isAndroid || isIos;

const imageData = {
  sunset: {
    src:
      'https://sketchbook.macr.ae/assets/particle-photos/leo-nagle-TLuNQu-5xP4-unsplash-small-blurred.jpg',
    ratio: 2 / 3,
    configPreset: {
      particles: isMobile ? 20e3 : 40e3,
      color: true,
      radiusValExponent: 1.5,
      alphaValMultiplier: 0.85,
      alphaValExponent: 1.2,
      pointSizeMultiplier: isMobile ? 20 : 10,
      twinkleFactor: 0
    }
  },
  woman: {
    src:
      'https://sketchbook.macr.ae/assets/particle-photos/thea-hoyer-CrJyu9HoeBg-unsplash-small-blurred.jpg',
    ratio: 2 / 3,
    configPreset: {
      color: false,
      particles: 30e3,
      radiusValExponent: 2,
      alphaValExponent: 1.5,
      alphaValMultiplier: 0.85,
      pointSizeMultiplier: 10,
      twinkleFactor: 0
    }
  },
  zebra: {
    src:
      'https://sketchbook.macr.ae/assets/particle-photos/frida-bredesen-c_cPNXlovvY-unsplash-small-blurred.png',
    ratio: 1,
    configPreset: {
      color: false,
      particles: 30e3,
      radiusValExponent: 2,
      alphaValExponent: 1.5,
      alphaValMultiplier: 1,
      pointSizeMultiplier: 10,
      twinkleFrequency: 12,
      twinkleIntensity: 25,
      twinkleFactor: 0.7
    }
  },
  'bucket hat': {
    src: 'https://sketchbook.macr.ae/assets/particle-photos/brandon-webb-FwjkcL9Hpx8-unsplash-small.jpg',
    ratio: 3 / 2,
    configPreset: {
      color: true,
      radiusValExponent: 0.7,
      alphaValExponent: 0.7,
      alphaValMultiplier: 1,
      pointSizeMultiplier: 7,
      twinkleFactor: 0
    }
  },
  rhino: {
    src: 'https://sketchbook.macr.ae/assets/particle-photos/rhino.jpeg',
    ratio: 422 / 222,
    configPreset: {
      particles: 50e3,
      radiusValExponent: 1.3,
      alphaValExponent: 0.1,
      alphaValMultiplier: 1,
      color: true,
      pointSizeMultiplier: 8,
      twinkleFactor: 0.7
    }
  }
};

new Vue({
  el: '.canvas-container',
  data: () => {
    const image = 'rhino';

    return {
      status: 'playing',
      width: undefined,
      height: undefined,
      showHelp: false,
      showIosWarning: false,
      userTexture: undefined,
      config: {
        // Init config
        particles: 40e3,
        particleBaseSpeed: isMobile ? 8 : 5,

        // Shader config
        radiusValExponent: 1.5,
        alphaValExponent: 1.2,
        alphaValMultiplier: 0.85,
        color: true,
        xInNoiseMultiplier: 200, // Not user configurable, bit buggy
        xOutNoiseMultiplier: isMobile ? 0.4 : 0.2,
        yInNoiseMultiplier: 1234, // Not user configurable, pointless
        yOutNoiseMultiplier: isMobile ? 0.004 : 0.002,
        pointSizeMultiplier: 10,
        twinkleFrequency: 12,
        twinkleIntensity: 25,
        twinkleFactor: 0,

        image,
        ...imageData[image].configPreset
      }
    };
  },
  mounted() {
    document.querySelector('.loading').style.display = 'none';
    this.$el.style.display = 'flex';

    this.setSize();
    this.init().then(() => {
      this.frame();
    });

    const gui = new dat.GUI();
    this.gui = gui;

    gui
      .add(this.config, 'image', Object.keys(imageData).concat('user'))
      .listen();
    gui.add(this.config, 'particles', 5000, 100000, 1000).listen();
    gui.add(this.config, 'particleBaseSpeed', 0, 50).listen();
    gui.add(this.config, 'radiusValExponent', 0.1, 10).listen();
    gui.add(this.config, 'alphaValExponent', 0.1, 10).listen();
    gui.add(this.config, 'alphaValMultiplier', 0.1, 1).listen();
    gui.add(this.config, 'color').listen();
    gui.add(this.config, 'xOutNoiseMultiplier', 0, 1).listen();
    gui.add(this.config, 'yOutNoiseMultiplier', 0, 0.1).listen();
    gui.add(this.config, 'pointSizeMultiplier', 1, 30).listen();
    gui.add(this.config, 'twinkleFrequency', 1, 50).listen();
    gui.add(this.config, 'twinkleIntensity', 1, 50).listen();
    gui.add(this.config, 'twinkleFactor', 0, 1).listen();

    this.stats = new Stats();
    this.stats.showPanel(0); // 0: fps, 1: ms, 2: mb, 3+: custom
    document.body.appendChild(this.stats.dom);

    if (isIos) {
      this.status = 'paused';
      this.showIosWarning = true;
      gui.close();
    }
  },
  beforeDestroy() {
    cancelAnimationFrame(this.frameId);

    if (this.gui) {
      this.gui.destroy();
    }
    if (this.stats) {
      this.stats.dom.remove();
      delete this.stats;
    }
  },
  methods: {
    setSize() {
      const canvas = this.$refs.canvas;
      this.gl = canvas.getContext('webgl', { preserveDrawingBuffer: true });

      this.dpr = window.devicePixelRatio;
      if (window.innerWidth < window.innerHeight * this.imageData.ratio) {
        this.width = window.innerWidth * this.dpr;
        this.height = (window.innerWidth / this.imageData.ratio) * this.dpr;
      } else {
        this.height = window.innerHeight * this.dpr;
        this.width = window.innerHeight * this.imageData.ratio * this.dpr;
      }

      canvas.width = this.width;
      canvas.height = this.height;
    },
    init() {
      const { gl, config } = this;

      gl.enable(gl.BLEND);
      gl.blendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA);

      this.programInfo = twgl.createProgramInfo(gl, ['vs', 'fs']);

      const particleData = {
        xs: [],
        initialOffsets: [],
        speeds: []
      };
      for (let i = 0; i < config.particles; i++) {
        particleData.xs.push(i / config.particles);
        particleData.initialOffsets.push(random.range(-1, 1));
        particleData.speeds.push(random.range(0, config.particleBaseSpeed));
      }

      this.particleData = particleData;

      twgl.setAttributePrefix('a_');
      this.bufferInfo = twgl.createBufferInfoFromArrays(gl, {
        x: {
          numComponents: 1,
          data: particleData.xs
        },
        initial_offset: {
          numComponents: 1,
          data: particleData.initialOffsets
        },
        speed: {
          numComponents: 1,
          data: particleData.speeds
        }
      });
      twgl.setBuffersAndAttributes(gl, this.programInfo, this.bufferInfo);

      if (this.images) {
        return Promise.resolve();
      }

      return new Promise(resolve => {
        // Use a blurred image instead of sampling an area of more than one pixel
        // in the fragment shader - do the work ahead of time!
        this.images = twgl.createTextures(gl, imageData, resolve);
      });
    },
    frame(timestamp = 0) {
      if (this.status !== 'recording') {
        this.frameId = requestAnimationFrame(this.frame);
      }

      if (this.status === 'paused') {
        return;
      }

      this.stats.begin();

      const { gl, programInfo, bufferInfo, width, height, config } = this;

      gl.viewport(0, 0, width, height);
      gl.useProgram(programInfo.program);
      gl.clear(gl.COLOR_BUFFER_BIT);

      const uniforms = {
        u_time: timestamp,
        u_image_texture:
          config.image === 'user'
            ? this.userTexture.texture
            : this.images[config.image],
        u_width: width,
        u_height: height,
        u_dpr: this.dpr,
        u_radius_val_exponent: config.radiusValExponent,
        u_alpha_val_exponent: config.alphaValExponent,
        u_alpha_val_multiplier: config.alphaValMultiplier,
        u_color: config.color,
        u_x_in_noise_multiplier: config.xInNoiseMultiplier,
        u_x_out_noise_multiplier: config.xOutNoiseMultiplier,
        u_y_in_noise_multiplier: config.yInNoiseMultiplier,
        u_y_out_noise_multiplier: config.yOutNoiseMultiplier,
        u_point_size_multiplier: config.pointSizeMultiplier,
        u_twinkle_frequency: config.twinkleFrequency,
        u_twinkle_intensity: config.twinkleIntensity,
        u_twinkle_factor: config.twinkleFactor
      };

      twgl.setUniforms(programInfo, uniforms);
      twgl.drawBufferInfo(gl, bufferInfo, gl.POINTS);

      this.stats.end();
    },
    handleDrop(e) {
      const image = e.dataTransfer.files[0];
      if (!image.type.startsWith('image/')) {
        return;
      }

      const reader = new FileReader();
      reader.onload = () => {
        const img = document.createElement('img');

        img.onload = () => {
          const texture = twgl.createTexture(this.gl, { src: img });
          this.userTexture = { texture, ratio: img.width / img.height };
          this.config.image = 'user';
          this.setSize();

          if (img.width > 500 && img.height > 500) {
            setTimeout(() => {
              alert(
                'Heads up, this works better with low resolution images: see the help for more info'
              );
            });
          }
        };

        img.src = reader.result;
      };
      reader.readAsDataURL(image);
    }
  },
  computed: {
    imageData() {
      return this.config.image === 'user'
        ? this.userTexture
        : imageData[this.config.image];
    }
  },
  watch: {
    'config.particles': 'init',
    'config.particleBaseSpeed': 'init',
    'config.image'(image, oldImage) {
      if (image === 'user' && !this.userTexture) {
        alert('Drag and drop an image onto this window to test your own image');
        this.config.image = oldImage;
        return;
      }

      this.setSize();

      if (this.imageData.configPreset) {
        for (let [key, value] of Object.entries(this.imageData.configPreset)) {
          this.config[key] = value;
        }
      }
    }
  }
});

              
            
!
999px

Console