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HomeWeb Front-endHTML TutorialCSS3动画之3D旋转书本效果

有一些前沿的电商网站已经开始使用3D模型来展示商品并支持在线定制,而其中图书的展示是最为简单的一种,无需复杂的建模过程,使用图片和CSS3的一些变换即可实现更好的展示效果,简洁而实用。 
书本的3D模型是所有商品中最为简单的,因为其本质上就是一个立方体(cube),只是带有封面/封底和左侧封条。 所以要构造一个3D书本展示,问题就被分解为构造一个立方体+旋转+图片背景。 

1. 构造一个立方体 

要创建一个立方体,首先我们需要创建一个虚拟的三维视觉空间,这可以通过设置包容器元素的perspective属性获得。

CSS3动画之3D旋转书本效果

<code class="language-css">.stage {    
width: 200px;    
height: 260px;    
perspective: 1000px;    
perspective-origin: center center;// 缺省值,可忽略    
}  </code>

上述代码把元素放在距离观察点1000px的地方(Z轴向),并且在X/Y轴向上居中。 

<code class="language-html"><div class="stage">    
<div class="cube">    
<figure class="back"></figure>    
<figure class="top"></figure>    
<figure class="bottom"></figure>    
<figure class="left"></figure>    
<figure class="right"></figure>    
<figure class="front"></figure>    
</div>    
</div>   </code>

接着,我们在包容器元素里面添加一个立方体元素,6个边(上下左右和前后),之所以使用figure,是因为需要支持贴图。 
我们需要根据书本的厚度和长宽来确定立方体各个面的坐标位置,在本例中所用书本模型(一本MySQL书)的绝对厚度为18.2px,高度260px,宽度197.6px。 
那么根据简单的几何知识,前后面距离立方体中心的距离为18.2/2=9.1px,其中“后”元素需要再翻转一下(即“背”过去)。 

<code class="language-css">.front {    
transform: translateZ(9.1px);    
}    
.back {    
transform: rotateY(180deg) translateZ(9.1px);    
}   </code>

用类似的计算方法,我们可以把其他4条边放置(平移+旋转变换)到各自的位置,从而拼装成一个虚拟的立方体。 

<code class="language-css">.front {    
transform: translateZ(9.1px);    
}    
.back {    
transform: rotateY(180deg) translateZ(9.1px);    
}    
.top {    
transform: rotateX(90deg) rotateZ(90deg) translateZ(98.8px) translateY(-89.7px);    
width: 18.2px;    
height: 197.6px;    
}    
.bottombottom {    
transform: rotateX(-90deg) rotateZ(90deg) translateZ(161.2px) translateY(-89.7px);    
}    
.left {    
transform: rotateY(-90deg) translateZ(9.1px);    
width: 18.2px;    
}    
.rightright {    
transform: rotateY(90deg) translateZ(188.5px);    
width: 18.2px;    
}  </code>

 

2. 添加封面 

接着我们给前后以及左侧面元素添加背景图(可以使用一张图,然后从不同的位置截取),给其他3个面添加背景颜色,并给“底”面添加阴影效果:

<code class="language-css">.front {    
transform: translateZ(9.1px);    
background: url("//wow.techbrood.com/uploads/160301/mysql.png") top rightright;    
background-size: auto 100%;    
}    
.back {    
transform: rotateY(180deg) translateZ(9.1px);    
background: url("//wow.techbrood.com/uploads/160301/mysql.png") top left;    
background-size: auto 100%;    
}    
.top {    
transform: rotateX(90deg) rotateZ(90deg) translateZ(98.8px) translateY(-89.7px);    
background: #fafafa;    
width: 18.2px;    
height: 197.6px;    
}    
.bottombottom {    
transform: rotateX(-90deg) rotateZ(90deg) translateZ(161.2px) translateY(-89.7px);    
background: #ccc;    
width: 18.2px;    
height: 197.6px;    
-webkit-filter: drop-shadow(0 0 26px rgba(0, 0, 0, 0.75));    
}    
.left {    
transform: rotateY(-90deg) translateZ(9.1px);    
background: url("//wow.techbrood.com/uploads/160301/mysql.png") top center;    
background-size: auto 100%;    
width: 18.2px;    
}    
.rightright {    
transform: rotateY(90deg) translateZ(188.5px);    
background: #ddd;    
background-size: auto 100%;    
width: 18.2px;    
}  </code>

这样我们就实现了一个逼真的3D书本视觉模型。 

 

3. 添加旋转动画 

这个比较简单,使用rotateY方法就可以。 

<code class="language-css">@-webkit-keyframes rotate {    
0% {    
transform: rotateY(0) translateX(-18.2px);    
}    
100% {    
transform: rotateY(360deg) translateX(-18.2px);    
}    
} </code>

最终的效果图如下:

CSS3动画之3D旋转书本效果

以上是本文全部类容,如果需要了解更多CSS3动画请阅读css3 教程中的css3 动画章节

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