threejs_idw/index.html at master · jdenisgiguere/threejs_idw · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div id="container"></div>

<script id="vertexShader" type="x-shader/x-vertex">

        void main() {
            gl_Position = vec4( position, 1.0 );
        }


</script>
<script id="fragmentShader" type="x-shader/x-fragment">
        uniform vec2 u_resolution;
        uniform float u_time;
        uniform vec3 u_colors [3];
        uniform sampler2D uTex;

        // The Book of Shaders by Patricio Gonzalez Vivo & Jen Lowe
        vec3 rgb2hsb( in vec3 c ){
            vec4 K = vec4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
            vec4 p = mix(vec4(c.bg, K.wz),
                         vec4(c.gb, K.xy),
                         step(c.b, c.g));
            vec4 q = mix(vec4(p.xyw, c.r),
                         vec4(c.r, p.yzx),
                         step(p.x, c.r));
            float d = q.x - min(q.w, q.y);
            float e = 1.0e-10;
            return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + e)),
                        d / (q.x + e),
                        q.x);
        }

        float idw(in vec2 _st) {
             vec2 loc = vec2(0.3,0.3);
             vec2 loc2 = vec2(0.7, 0.7);
             vec3 pts;

             float prop = 0.0;
             float dist = 0.0;

             float weigthed_prop = 0.0;

             float weigthed_prop_sum = 0.0;
             float weigth_sum = 0.0;

             for (int i = 0; i < NB_POINTS; i++) {
                 float pix_size = 1.0 / float(NB_POINTS);
                 vec4 item = texture2D(uTex,vec2((0.5 + float(i)) * pix_size,0));
                 loc = vec2(item[0], item[1]);
                 //loc = vec2(float(i) / float(NB_POINTS), 0.5);
                 prop = float(i) / float(NB_POINTS);
                 prop = item[2];
                 dist = distance(_st, loc);
                 if (dist < 0.05) {
                 weigthed_prop_sum = weigthed_prop_sum + (prop / (dist * dist));
                 weigth_sum = weigth_sum + (1.0 / (dist * dist));
                 }
             }

             return (weigthed_prop_sum / weigth_sum);
        }

        vec3 prop2color(in float _prop) {

             return vec3(0.0, 0.0, _prop);
        }

        vec3 three_color_gradient(in float _value, in vec3 _rgb_a, in vec3 _rgb_b, in vec3 _rgb_c) {
           vec3 _hsb_a = rgb2hsb(_rgb_a);
           vec3 _hsb_b = rgb2hsb(_rgb_b);
           vec3 _hsb_c = rgb2hsb(_rgb_c);

           if (_value < 0.5) {
               return mix(_rgb_a, _rgb_b, 2.0 * _value );
           } else {
               return mix(_rgb_b, _rgb_c, 2.0 * (_value - 0.5));
           }
        }

        void main() {
            vec2 st = gl_FragCoord.xy/u_resolution.xy;

            float prop_min = 0.0;
            float prop_max = 1.0;

            float prop = idw(st);


            vec3 color = three_color_gradient(smoothstep(prop_min, prop_max, prop), u_colors[0], u_colors[1], u_colors[2]);


            gl_FragColor=vec4(color,1.0);

        }


</script>
<script src="bundle.js"></script>
<script>
  var container;
  var camera, scene, renderer;
  var uniforms;
  var x, y, z;

  init();
  animate();

  function init () {
    container = document.getElementById('container');

    var particles = 4000;

    camera = new THREE.Camera();
    camera.position.z = 1;
    var points = new Float32Array( particles * 3 );
    for ( var i = 0, i3 = 0; i < particles; i ++, i3 += 3 ) {
      x = Math.random();
      y = Math.random();
      z = x * 0.8 + y * 0.2 + (Math.random() - 0.5) * 0.3;
      z = Math.min(Math.max(z, 0.0), 1.0);
      points[ i3 + 0 ] = (x);
      points[ i3 + 1 ] = ( y) ;
      points[ i3 + 2 ] = ( z);
    }

    //console.log(points);


    scene = new THREE.Scene();

    var geometry = new THREE.PlaneBufferGeometry(2, 2);

    var texture = new THREE.DataTexture(points , particles, 1, THREE.RGBFormat, THREE.FloatType, THREE.UVMapping);
    texture.needsUpdate = true;

    uniforms = {
      u_time: {type: 'f', value: 1.0},
      u_resolution: {type: 'v2', value: new THREE.Vector2()},
      u_mouse: {type: 'v2', value: new THREE.Vector2()},
      u_colors: {
        type: 'v3v', value: [ new THREE.Color(0x9e0142), new THREE.Color(0xffffbf), new THREE.Color(0x5e4fa2)]
      },
      uTex : { type: "t", value: texture } // regular texture

    }

    var material = new THREE.ShaderMaterial({
      defines: {
        NB_POINTS: particles
      },
      uniforms: uniforms,
      vertexShader: document.getElementById('vertexShader').textContent,
      fragmentShader: document.getElementById('fragmentShader').textContent
    });

    var mesh = new THREE.Mesh(geometry, material);
    scene.add(mesh);

    renderer = new THREE.WebGLRenderer();
    renderer.setPixelRatio(window.devicePixelRatio);

    container.appendChild(renderer.domElement);

    onWindowResize();
    window.addEventListener('resize', onWindowResize, false);

    document.onmousemove = function (e) {
      uniforms.u_mouse.value.x = e.pageX;
      uniforms.u_mouse.value.y = e.pageY;
    }
  }

  function onWindowResize (event) {
    renderer.setSize(window.innerWidth, window.innerHeight);
    uniforms.u_resolution.value.x = renderer.domElement.width;
    uniforms.u_resolution.value.y = renderer.domElement.height;
  }

  function animate () {
    setTimeout( function() {

        requestAnimationFrame( animate );

    }, 1000 / 1.0 );

    render();
  }

  function render () {
    uniforms.u_time.value += 0.05;
    renderer.render(scene, camera);
  }
</script>
</body>
</html>