verge3d-code-examples/webgl_buffergeometry_instancing_billboards.html at master · Soft8Soft/verge3d-code-examples · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
<!DOCTYPE html>
<html lang="en">
<head>
  <title>Verge3D webgl - instanced particles - billboards - colors</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
  <link type="text/css" rel="stylesheet" href="main.css">
</head>
<body>

  <div id="info">
    <a href="https://www.soft8soft.com/verge3d" target="_blank" rel="noopener">Verge3D</a> - instanced circle billboards - colors
    <div id="notSupported" style="display:none">Sorry, your graphics card + browser does not support hardware instancing</div>
  </div>

  <script id="vshader" type="x-shader/x-vertex">
    precision highp float;
    uniform mat4 modelViewMatrix;
    uniform mat4 projectionMatrix;
    uniform float time;

    attribute vec3 position;
    attribute vec2 uv;
    attribute vec3 translate;

    varying vec2 vUv;
    varying float vScale;

    void main() {

      vec4 mvPosition = modelViewMatrix * vec4(translate, 1.0);
      vec3 trTime = vec3(translate.x + time,translate.y + time,translate.z + time);
      float scale =  sin(trTime.x * 2.1) + sin(trTime.y * 3.2) + sin(trTime.z * 4.3);
      vScale = scale;
      scale = scale * 10.0 + 10.0;
      mvPosition.xyz += position * scale;
      vUv = uv;
      gl_Position = projectionMatrix * mvPosition;

    }
  </script>
  <script id="fshader" type="x-shader/x-fragment">
    precision highp float;

    uniform sampler2D map;

    varying vec2 vUv;
    varying float vScale;

    // HSL to RGB Convertion helpers
    vec3 HUEtoRGB(float H){
      H = mod(H,1.0);
      float R = abs(H * 6.0 - 3.0) -1.0;
      float G = 2.0 - abs(H * 6.0 - 2.0);
      float B = 2.0 - abs(H * 6.0 - 4.0);
      return clamp(vec3(R,G,B),0.0,1.0);
    }

    vec3 HSLtoRGB(vec3 HSL){
      vec3 RGB = HUEtoRGB(HSL.x);
      float C = (1.0 - abs(2.0 * HSL.z - 1.0)) * HSL.y;
      return (RGB - 0.5) * C + HSL.z;
    }

    void main() {
      vec4 diffuseColor = texture2D(map, vUv);
      gl_FragColor = vec4(diffuseColor.xyz * HSLtoRGB(vec3(vScale/5.0, 1.0, 0.5)), diffuseColor.w);

      if (diffuseColor.w < 0.5) discard;
    }
  </script>

  <!-- Import maps polyfill -->
  <!-- Remove this when import maps will be widely supported -->
  <script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>

  <script type="importmap">
    {
      "imports": {
        "v3d": "../build/v3d.module.js",
        "v3d/addons/": "./jsm/"
      }
    }
  </script>

  <script type="module">
    import * as v3d from 'v3d';

    import Stats from 'v3d/addons/libs/stats.module.js';

    let container, stats;

    let camera, scene, renderer;
    let geometry, material, mesh;

    function init() {

      renderer = new v3d.WebGLRenderer();

      if (renderer.capabilities.isWebGL2 === false && renderer.extensions.has('ANGLE_instanced_arrays') === false) {

        document.getElementById('notSupported').style.display = '';
        return false;

      }

      container = document.createElement('div');
      document.body.appendChild(container);

      camera = new v3d.PerspectiveCamera(50, window.innerWidth / window.innerHeight, 1, 5000);
      camera.position.z = 1400;

      scene = new v3d.Scene();

      const circleGeometry = new v3d.CircleGeometry(1, 6);

      geometry = new v3d.InstancedBufferGeometry();
      geometry.index = circleGeometry.index;
      geometry.attributes = circleGeometry.attributes;

      const particleCount = 75000;

      const translateArray = new Float32Array(particleCount * 3);

      for (let i = 0, i3 = 0, l = particleCount; i < l; i++, i3 += 3) {

        translateArray[i3 + 0] = Math.random() * 2 - 1;
        translateArray[i3 + 1] = Math.random() * 2 - 1;
        translateArray[i3 + 2] = Math.random() * 2 - 1;

      }

      geometry.setAttribute('translate', new v3d.InstancedBufferAttribute(translateArray, 3));

      material = new v3d.RawShaderMaterial({
        uniforms: {
          'map': { value: new v3d.TextureLoader().load('textures/sprites/circle.png') },
          'time': { value: 0.0 }
        },
        vertexShader: document.getElementById('vshader').textContent,
        fragmentShader: document.getElementById('fshader').textContent,
        depthTest: true,
        depthWrite: true
      });

      mesh = new v3d.Mesh(geometry, material);
      mesh.scale.set(500, 500, 500);
      scene.add(mesh);

      renderer.setPixelRatio(window.devicePixelRatio);
      renderer.setSize(window.innerWidth, window.innerHeight);
      container.appendChild(renderer.domElement);

      stats = new Stats();
      container.appendChild(stats.dom);

      window.addEventListener('resize', onWindowResize);

      return true;

    }

    function onWindowResize() {

      camera.aspect = window.innerWidth / window.innerHeight;
      camera.updateProjectionMatrix();

      renderer.setSize(window.innerWidth, window.innerHeight);

    }

    function animate() {

      requestAnimationFrame(animate);

      render();
      stats.update();

    }

    function render() {

      const time = performance.now() * 0.0005;

      material.uniforms['time'].value = time;

      mesh.rotation.x = time * 0.2;
      mesh.rotation.y = time * 0.4;

      renderer.render(scene, camera);

    }

    if (init()) {

      animate();

    }
  </script>

</body>
</html>