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。
.stage { width: 200px; height: 260px; perspective: 1000px; perspective-origin: center center;// 缺省值,可忽略}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。
<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>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)。
.front { transform: translateZ(9.1px);}.back { transform: rotateY(180deg) translateZ(9.1px);}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。
.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;}.bottom { transform: rotateX(-90deg) rotateZ(90deg) translateZ(161.2px) translateY(-89.7px);}.left { transform: rotateY(-90deg) translateZ(9.1px); width: 18.2px;}.right { transform: rotateY(90deg) translateZ(188.5px); width: 18.2px;}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:
.front { transform: translateZ(9.1px); background: url("//wow.techbrood.com/uploads/160301/mysql.png") top right; 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;}.bottom { 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;}.right { transform: rotateY(90deg) translateZ(188.5px); background: #ddd; background-size: auto 100%; width: 18.2px;}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。
@-webkit-keyframes rotate { 0% { transform: rotateY(0) translateX(-18.2px); } 100% { transform: rotateY(360deg) translateX(-18.2px); }}最终的效果图如下:
你可以在踏得网上自己试试看 (http://wow.techbrood.com/fiddle/17587)。
by iefreer

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