onmouseover onmouseout 图像变化液体效果

Question

我需要像here

那样用液体效果实现图像变化

我有一个带有图像的简单块我需要将 onmouseover 中的此图像（更改为其他图像）具有此效果，并将 return 更改为 onmouseout 中的初始位置也使用此效果

const avatarQuantumBreak = document.querySelector(".avatar_quantum_break");
const avatar = document.querySelector(".avatar");

avatarQuantumBreak.style.opacity = "0";

let hover = () => avatarQuantumBreak.style.opacity = "1";
let normal = () => avatarQuantumBreak.style.opacity = "0";

avatar.onmouseover = () => hover();
avatar.onmouseout = () => normal();

html , body {
  height:100%;
}

.avatar {
  position: relative;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  height: 195px;
}
.avatar_simple,
.avatar_quantum_break {
  position: absolute;
  display: block;
  text-align:center;
  transition: opacity 1s ease-out;
}
.avatar .avatar_simple img,
.avatar .avatar_quantum_break img {
  border-radius: 50%;
  display: inline-block;
  width: 86%;
  height: 100%;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/2.0.2/TweenMax.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/97/three.min.js"></script>


<div class=avatar>
    <span class=avatar_simple>
        <img src="https://pixel.nymag.com/imgs/fashion/daily/2014/05/27/27-amber-heard.w330.h330.jpg">
    </span>
    <span class=avatar_quantum_break>
        <img src="https://pixel.nymag.com/imgs/daily/vulture/2016/05/31/31-amber-heard.w330.h330.jpg">
    </span>
</div>

图片transition触发液态动画的函数如下

transitionNext() {
    TweenMax.to(this.mat.uniforms.dispPower, 2.5, {
      value: 1,
      ease: Expo.easeInOut,
      onUpdate: this.render,
      onComplete: () => {
        this.mat.uniforms.dispPower.value = 0.0
        this.changeTexture()
        this.render.bind(this)
        this.state.animating = false
      }
    })

我尝试使用此功能，但这对我没有帮助。

我也尝试更改此 Array 行 15 中的图像，但这也没有帮助。

this.images = [ //1
      'https://s3-us-west-2.amazonaws.com/s.cdpn.io/58281/bg1.jpg',
      'https://s3-us-west-2.amazonaws.com/s.cdpn.io/58281/bg2.jpg',
      'https://s3-us-west-2.amazonaws.com/s.cdpn.io/58281/bg3.jpg'
    ]

这个函数启动了动画

listeners() {
   window.addEventListener('wheel', this.nextSlide, { passive: true })
}

下一张幻灯片 函数

nextSlide() {
   if (this.state.animating) return

   this.state.animating = true

   this.transitionNext()

   this.data.current = this.data.current === this.data.total ? 0 : this.data.current + 1
this.data.next = this.data.current === this.data.total ? 0 : this.data.current + 1
}

请帮忙..

Answer 1

不错 - 实时 vfx 满足 Web 开发:)

这个效果的所有魔法都是用 GLSL 着色器完成的（你可以在例子的底部看到它 html）在这里我添加了一些评论

  // next lines are input data that gpu gets form javascript
  varying vec2 vUv; // uv coordinate of current pixel
  uniform sampler2D texture1; // picture 1
  uniform sampler2D texture2; // picture 2
  uniform sampler2D disp; // noise texture
  uniform float dispPower; // effect progress
  uniform float intensity; // effect scale

  void main() {
    vec2 uv = vUv;

    vec4 disp = texture2D(disp, uv); // read noise texture
    vec2 dispVec = vec2(disp.x, disp.y); // get red and green values

    // calculate uv displacement
    vec2 distPos1 = uv + (dispVec * intensity * dispPower); 
    vec2 distPos2 = uv + (dispVec * -(intensity * (1.0 - dispPower)));

    // sample images with displaced uv
    vec4 _texture1 = texture2D(texture1, distPos1); 
    vec4 _texture2 = texture2D(texture2, distPos2);

    // mix both pictures using effect dispPower value and output pixel color
    gl_FragColor = mix(_texture1, _texture2, dispPower);
  }

它需要3个纹理作为输入：picture1 picture2和用于扭曲uv的噪声纹理并在 GPU 上动态生成一帧过渡效果的一个像素的颜色值此着色器应用于表面的所有像素

此处使用的技术称为 "Texture Distortion" 或 "UV Displacement" 这个想法是使用存储在噪声纹理中的数据调整 UV 坐标。

开始学习 GLSL 的好地方是 https://thebookofshaders.com/

GLSL 参考 http://www.shaderific.com/glsl/

此外，我建议访问 https://www.shadertoy.com/

欢迎来到实时 vfx 的神奇世界

onmouseover onmouseout 图像变化液体效果

Onmouseover onmouseout image change Liquid effect

javascript

three.js

gsap