Question

我需要像here

那样以液体效果实现图像变化

我有一个简单的图像块，需要使用此效果将onmouseover中的该图像更改为其他图像，并使用此效果将其返回到onmouseout中的初始位置

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>

触发{strong>液体动画的图像transition功能在下面

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。

我也尝试在此Array第 15 行中更改图像，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'
    ]

此功能开始播放动画

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

下一张幻灯片功能

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
}

请帮助。

Answer 1

一个不错的-实时vfx可以进行Web开发：）

此效果的所有魔力都由GLSL着色器完成（您可以在示例html的底部看到它）在这里我已经添加了一些评论

  // 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上即时生成一帧过渡效果的一个像素的颜色值该着色器应用于表面的所有像素

此处使用的一种称为“纹理变形”或“ UV位移”的技术想法是使用存储在噪波纹理中的数据来调整UV坐标。

https://thebookofshaders.com/

是开始学习GLSL的好地方

GLSL参考http://www.shaderific.com/glsl/

另外，我建议访问https://www.shadertoy.com/

欢迎来到实时vfx的神奇世界

鼠标悬停鼠标悬停图像变化液体效果

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