先看效果：
再看代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>可调节的烟雾特效</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r125/three.min.js"></script>
<script src="https://unpkg.com/three@0.125.2/examples/js/controls/OrbitControls.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/dat-gui/0.7.7/dat.gui.min.js"></script>
<style>
* {
margin: 0;
padding: 0;
}
html,
body {
overflow: hidden;
}
.webgl {
position: fixed;
top: 0;
left: 0;
outline: none;
}
</style>
</head>
<body>
<script id="vertexShader" type="x-shader/x-vertex">
#include <fog_pars_vertex>
uniform float uTime;
uniform float uBigWavesElevation;
uniform vec2 uBigWavesFrequency;
uniform float uBigWaveSpeed;
uniform float uSmallWavesElevation;
uniform float uSmallWavesFrequency;
uniform float uSmallWavesSpeed;
uniform float uSmallWavesIterations;
varying float vElevation;
// Classic Perlin 3D Noise
// by Stefan Gustavson
//
vec4 permute(vec4 x){return mod(((x*34.0)+1.0)*x, 289.0);}
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);}
float cnoise(vec3 P){
vec3 Pi0 = floor(P); // Integer part for indexing
vec3 Pi1 = Pi0 + vec3(1.0); // Integer part + 1
Pi0 = mod(Pi0, 289.0);
Pi1 = mod(Pi1, 289.0);
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 / 7.0;
vec4 gy0 = fract(floor(gx0) / 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 / 7.0;
vec4 gy1 = fract(floor(gx1) / 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;
}
void main() {
#include <begin_vertex>
#include <project_vertex>
#include <fog_vertex>
vec4 modelPosition = modelMatrix * vec4(position, 1.0);
float elevation =
sin(modelPosition.x * uBigWavesFrequency.x + uTime * uBigWaveSpeed)
* sin(modelPosition.z * uBigWavesFrequency.y + uTime * uBigWaveSpeed)
* uBigWavesElevation;
for(float i = 1.0; i <= 10.0; i++) {
elevation -= abs(
cnoise(
vec3(modelPosition.xz * uSmallWavesFrequency * i, uTime * uSmallWavesSpeed)
)
* uSmallWavesElevation / i
);
if(i >= uSmallWavesIterations ) {
break;
}
}
modelPosition.y += elevation;
vec4 viewPosition = viewMatrix * modelPosition;
vec4 projectedPosition = projectionMatrix * viewPosition;
gl_Position = projectedPosition;
vElevation = elevation;
}
</script>
<script id="fragmentShader" type="x-shader/x-fragment">
#include <fog_pars_fragment>
precision mediump float;
uniform vec3 uDepthColor;
uniform vec3 uSurfaceColor;
uniform float uColorOffset;
uniform float uColorMultiplier;
varying float vElevation;
void main() {
float mixStrength = (vElevation + uColorOffset) * uColorMultiplier;
vec3 color = mix(uDepthColor, uSurfaceColor, mixStrength);
gl_FragColor = vec4(color, 1.0);
#include <fog_fragment>
}
</script>
<canvas class="webgl"></canvas>
</body>
<script>
const gui = new dat.GUI({ closed: false, width: 340 });
const bigWavesFolder = gui.addFolder("大浪");
const smallWavesFolder = gui.addFolder("小浪");
const colorFolder = gui.addFolder("颜色");
const debugObject = {
waveDepthColor: "#1e4d40",
waveSurfaceColor: "#4d9aaa",
fogNear: 1,
fogFar: 3,
fogColor: "#8e99a2" };
// Canvas
const canvas = document.querySelector("canvas.webgl");
// 场景
const scene = new THREE.Scene();
scene.fog = new THREE.Fog(
debugObject.fogColor,
debugObject.fogNear,
debugObject.fogFar);
scene.background = new THREE.Color(debugObject.fogColor);
const waterGeometry = new THREE.PlaneGeometry(12, 12, 512, 512);
const waterMaterial = new THREE.ShaderMaterial({
vertexShader: document.getElementById("vertexShader").textContent,
fragmentShader: document.getElementById("fragmentShader").textContent,
transparent: true,
fog: true,
uniforms: {
uTime: { value: 0 },
uMouse: { value: new THREE.Vector2() },
uBigWavesElevation: { value: 0.2 },
uBigWavesFrequency: { value: new THREE.Vector2(4, 2) },
uBigWaveSpeed: { value: 0.75 },
uSmallWavesElevation: { value: 0.15 },
uSmallWavesFrequency: { value: 3 },
uSmallWavesSpeed: { value: 0.2 },
uSmallWavesIterations: { value: 4 },
uDepthColor: { value: new THREE.Color(debugObject.waveDepthColor) },
uSurfaceColor: { value: new THREE.Color(debugObject.waveSurfaceColor) },
uColorOffset: { value: 0.08 },
uColorMultiplier: { value: 5 },
...THREE.UniformsLib["fog"] } });
const water = new THREE.Mesh(waterGeometry, waterMaterial);
water.rotation.x = -Math.PI * 0.5;
scene.add(water);
/**
* 大小
*/
const sizes = {
width: window.innerWidth,
height: window.innerHeight };
window.addEventListener("resize", () => {
// 更新大小
sizes.width = window.innerWidth;
sizes.height = window.innerHeight;
//更新相机
camera.aspect = sizes.width / sizes.height;
camera.updateProjectionMatrix();
//更新渲染器
renderer.setSize(sizes.width, sizes.height);
renderer.setPixelRatio(Math.min(window.devicePixelRatio, 2));
});
const camera = new THREE.PerspectiveCamera(
75,
sizes.width / sizes.height,
0.1,
100);
camera.position.set(1, 1, 1);
scene.add(camera);
// 控制
const controls = new THREE.OrbitControls(camera, canvas);
controls.enableDamping = true;
/**
* 渲染器
*/
const renderer = new THREE.WebGLRenderer({
canvas: canvas });
renderer.setSize(sizes.width, sizes.height);
renderer.setPixelRatio(Math.min(window.devicePixelRatio, 2));
// 大波浪
bigWavesFolder.
add(waterMaterial.uniforms.uBigWavesElevation, "value").
min(0).
max(1).
step(0.001).
name("海拔");
bigWavesFolder.
add(waterMaterial.uniforms.uBigWavesFrequency.value, "x").
min(0).
max(10).
step(0.001).
name("频率 X");
bigWavesFolder.
add(waterMaterial.uniforms.uBigWavesFrequency.value, "y").
min(0).
max(10).
step(0.001).
name("频率 Y");
bigWavesFolder.
add(waterMaterial.uniforms.uBigWaveSpeed, "value").
min(0.25).
max(5).
step(0.001).
name("速度");
// 小波浪
smallWavesFolder.
add(waterMaterial.uniforms.uSmallWavesElevation, "value").
min(0.0).
max(0.3).
step(0.001).
name("海拔");
smallWavesFolder.
add(waterMaterial.uniforms.uSmallWavesFrequency, "value").
min(0).
max(30).
step(0.001).
name("频率");
smallWavesFolder.
add(waterMaterial.uniforms.uSmallWavesSpeed, "value").
min(0.0).
max(1).
step(0.001).
name("速度");
smallWavesFolder.
add(waterMaterial.uniforms.uSmallWavesIterations, "value").
min(0).
max(10).
step(1).
name("迭代次数");
// Colors
colorFolder.
add(waterMaterial.uniforms.uColorOffset, "value").
min(0).
max(0.15).
step(0.0001).
name("颜色偏移");
colorFolder.
add(waterMaterial.uniforms.uColorMultiplier, "value").
min(0.0).
max(10.0).
step(0.001).
name("颜色增加");
colorFolder.
addColor(debugObject, "waveDepthColor").
name("波浪深度颜色").
onChange(() => {
waterMaterial.uniforms.uDepthColor.value.set(debugObject.waveDepthColor);
});
colorFolder.
addColor(debugObject, "waveSurfaceColor").
name("波面颜色").
onChange(() => {
waterMaterial.uniforms.uSurfaceColor.value.set(
debugObject.waveSurfaceColor);
});
colorFolder.
addColor(debugObject, "fogColor").
name("雾颜色").
onChange(() => {
waterMaterial.uniforms.fogColor.value.set(debugObject.fogColor);
scene.background.set(debugObject.fogColor);
scene.fog = new THREE.Fog(
debugObject.fogColor,
debugObject.fogNear,
debugObject.fogFar);
});
/**
* Animate
*/
const clock = new THREE.Clock();
const tick = () => {
const elapsedTime = clock.getElapsedTime();
controls.update();
waterMaterial.uniforms.uTime.value = elapsedTime;
renderer.render(scene, camera);
window.requestAnimationFrame(tick);
};
tick();
</script>
</html>
