three+webgl实现彩色沙尘粒子飘动动画效果代码-html代码-BFW代码库

代码语言：html

所属分类：粒子

代码描述：three+webgl实现彩色沙尘粒子飘动动画效果代码

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开

<!DOCTYPE html>
<html lang="en" >
<head>
  <meta charset="UTF-8">
<style>
    canvas {
  display: block;
}
</style>

</head>
<body>
<!-- partial:index.partial.html -->
<script id="shader-noise-perlin" type="x-shader">
//
// GLSL textureless classic 3D noise "cnoise",
// with an RSL-style periodic variant "pnoise".
// Author:  Stefan Gustavson (stefan.gustavson@liu.se)
// Version: 2011-10-11
//
// Many thanks to Ian McEwan of Ashima Arts for the
// ideas for permutation and gradient selection.
//
// Copyright (c) 2011 Stefan Gustavson. All rights reserved.
// Distributed under the MIT license. See LICENSE file.
// https://github.com/stegu/webgl-noise
//

vec3 mod289(vec3 x)
{
  return x - floor(x * (1.0 / 289.0)) * 289.0;
}

vec4 mod289(vec4 x)
{
  return x - floor(x * (1.0 / 289.0)) * 289.0;
}

vec4 permute(vec4 x)
{
  return mod289(((x*34.0)+1.0)*x);
}

vec4 taylorInvSqrt(vec4 r)
{
  return 1.79284291400159 - 0.85373472095314 * r;
}

vec3 fade(vec3 t) {
  return t*t*t*(t*(t*6.0-15.0)+10.0);
}

// Classic Perlin noise
float cnoise(vec3 P)
{
  vec3 Pi0 = floor(P); // Integer part for indexing
  vec3 Pi1 = Pi0 + vec3(1.0); // Integer part + 1
  Pi0 = mod289(Pi0);
  Pi1 = mod289(Pi1);
  vec3 Pf0 = fract(P); // Fractional part for interpolation
  vec3 Pf1 = Pf0 - vec3(1.0); // Fractional part - 1.0
  vec4 ix = vec4(Pi0.x, Pi1.x, Pi0.x, Pi1.x);
  vec4 iy = vec4(Pi0.yy, Pi1.yy);
  vec4 iz0 = Pi0.zzzz;
  vec4 iz1 = Pi1.zzzz;

  vec4 ixy = permute(permute(ix) + iy);
  vec4 ixy0 = permute(ixy + iz0);
  vec4 ixy1 = permute(ixy + iz1);

  vec4 gx0 = ixy0 * (1.0 / 7.0);
  vec4 gy0 = fract(floor(gx0) * (1.0 / 7.0)) - 0.5;
  gx0 = fract(gx0);
  vec4 gz0 = vec4(0.5) - abs(gx0) - abs(gy0);
  vec4 sz0 = step(gz0, vec4(0.0));
  gx0 -= sz0 * (step(0.0, gx0) - 0.5);
  gy0 -= sz0 * (step(0.0, gy0) - 0.5);

  vec4 gx1 = ixy1 * (1.0 / 7.0);
  vec4 gy1 = fract(floor(gx1) * (1.0 / 7.0)) - 0.5;
  gx1 = fract(gx1);
  vec4 gz1 = vec4(0.5) - abs(gx1) - abs(gy1);
  vec4 sz1 = step(gz1, vec4(0.0));
  gx1 -= sz1 * (step(0.0, gx1) - 0.5);
  gy1 -= sz1 * (step(0.0, gy1) - 0.5);

  vec3 g000 = vec3(gx0.x,gy0.x,gz0.x);
  vec3 g100 = vec3(gx0.y,gy0.y,gz0.y);
  vec3 g010 = vec3(gx0.z,gy0.z,gz0.z);
  vec3 g110 = vec3(gx0.w,gy0.w,gz0.w);
  vec3 g001 = vec3(gx1.x,gy1.x,gz1.x);
  vec3 g101 = vec3(gx1.y,gy1.y,gz1.y);
  vec3 g011 = vec3(gx1.z,gy1.z,gz1.z);
  vec3 g111 = vec3(gx1.w,gy1.w,gz1.w);

  vec4 norm0 = taylorInvSqrt(vec4(dot(g000, g000), dot(g010, g010), dot(g100, g100), dot(g110, g110)));
  g000 *= norm0.x;
  g010 *= norm0.y;
  g100 *= norm0.z;
  g110 *= norm0.w;
  vec4 norm1 = taylorInvSqrt(vec4(dot(g001, g001), dot(g011, g011), dot(g101, g101), dot(g111, g111)));
  g001 *= norm1.x;
  g011 *= norm1.y;
  g101 *= norm1.z;
  g111 *= norm1.w;

  float n000 = dot(g000, Pf0);
  float n100 = dot(g100, vec3(Pf1.x, Pf0.yz));
  float n010 = dot(g010, vec3(Pf0.x, Pf1.y, Pf0.z));
  float n110 = dot(g110, vec3(Pf1.xy, Pf0.z));
  float n001 = dot(g001, vec3(Pf0.xy, Pf1.z));
  float n101 = dot(g101, vec3(Pf1.x, Pf0.y, Pf1.z));
  float n011 = dot(g011, vec3(Pf0.x, Pf1.yz));
  float n111 = dot(g111, Pf1);

  vec3 fade_xyz = fade(Pf0);
  vec4 n_z = mix(vec4(n000, n100, n010, n110), vec4(n001, n101, n011, n111), fade_xyz.z);
  vec2 n_yz = mix(n_z.xy, n_z.zw, fade_xyz.y);
  float n_xyz = mix(n_yz.x, n_yz.y, fade_xyz.x); 
  return 2.2 * n_xyz;
}
</script>

<script id="shader-simulation-vertex" type="x-shader/x-vertex">
varying vec2 vUv;

void main() {
  vUv = uv;
  gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0);
}
</script>

<script id="shader-simulation-fragment" type="x-shader/x-fragment">
#include <common>

uniform sampler2D tData;
uniform vec2 resolution;
uniform float velocityMax;
uniform float time;
uniform float delta;

varying vec2 vUv;

void main() {
  vec4 particle = texture2D(tData, vUv);
  vec2 pPosition = particle.xy * resolution;
  vec2 pVelocity = particle.zw;
	
	vec3 seed = vec3(pPosition / resolution * 8.0, time / 5.0);
	float forceAngleOffset = sin(time / 16.0) * .25;
  float forceAngle = (cnoise(seed) + forceAngleOffset) * PI;
  vec2 force = vec2(cos(forceAngle), sin(forceAngle)) * .75;

  pVelocity += force;

  if (length(pVelocity) > velocityMax) {
    pVelocity = normalize(pVelocity) * velocityMax;
  }

  pPosition += pVelocity * delta;
  pPosition = mod(pPosition + resolution * .5, resolution) - resolution * .5;

  gl_FragColor = vec4(pPosition / resolution, pVelocity);
}
</script>

<script id="shader-particles-vertex" type="x-shader/x-vertex">
uniform sampler2D tData;
uniform vec2 resolution;

varying vec2 vUv;

void main() {
  vUv = uv;

  vec2 pPosition = texture2D(tData, vUv).rg * resolution;

  gl_PointSize = 1.0;
  gl_Position = projectionMatrix * modelViewMatrix * vec4(pPosition, 1.0, 1.0);
}
</script>

<script id="shader-particles-fragment" type="x-shader/x-fragment">
uniform sampler2D tData;
uniform float velocityMax;
uniform vec3 colorBase;
uniform vec3 colorIntense;

varying vec2 vUv;

void main() {
  vec4 particle = texture2D(tData, vUv);
  vec2 pVelocity = particle.zw;
  float intensity = pow(length(pVelocity) / velocityMax, 5.0);

  vec3 color = mix(colorBase, colorIntense, intensity);

  gl_FragColor = vec4(color, 1.0);
}
</script>

<script id="shader-copy-vertex" type="x-shader/x-vertex">
uniform sampler2D tData;
varying vec2 vUv;

void main() {
  vUv = uv;
  gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0);
}
</script>

<script id="shader-copy-fragment" type="x-shader/x-fragment">
uniform sampler2D tData;
varying vec2 vUv;

void main() {
  gl_FragColor = texture2D(tDat.........完整代码请登录后点击上方下载按钮下载查看