Teach you how to play with scc3 3d technology

To play with 3D in CSS3, you must understand a few words, namely perspective, rotate and translate. Perspective means looking at 2D things on the screen from a realistic perspective to show the 3D effect. Rotation is no longer a rotation on a 2D plane, but a rotation of a three-dimensional coordinate system, including rotation on the X-axis, Y-axis, and Z-axis. The same goes for panning.

Of course I will explain it theoretically, but I guess you still don’t understand it. Below are 3 gifs:

Rotate along the X-axis

Rotate along the Y-axis

Rotate along the Z axis

Rotation should be no problem, then it will be easier to understand translation, that is, on the X axis, Y axis, z axis moves.

You may say that perspective is difficult to understand. Let me introduce several properties of perspective.

perspective

The English name of perspective is perspective. Without this thing, there is no way to create a 3D effect. But how does this thing allow our browser to create a 3D effect? ​​You can see the following picture Picture, in fact, those who have studied painting should know the perspective relationship, and this is the truth here.

But it has a numerical value in css. For example, what does perspective: 1000px mean? We can understand it this way. If we look directly at an object, the object will be super large and occupy our line of sight. As we get farther and farther away from it, it will become smaller and the three-dimensional feeling will come out, right? In fact, this numerical structure By determining the distance between our eyes and the screen, a virtual 3D illusion is constructed.

perspective-origin

From the above we understand perspective, and add what this origin is. What we mentioned earlier is the distance between the eye and the object, and this is the line of sight of the eye. The different positions of our viewpoint determine the different scenes we see. The default is the center, which is perspective-origin: 50% 50%. The first value is the X-axis on which the 3D element is based, and the second one is defined on the y-axis. Position on

When you define the perspective-origin attribute for an element, its child elements get the perspective effect, not the element itself. Must be used with the perspective attribute, and only affects 3D transform elements.

But it has a numerical value in css. For example, what does perspective: 1000px mean? We can understand it this way. If we look directly at an object, the object will be super large and occupy our line of sight. As we get farther and farther away from it, it will become smaller and the three-dimensional feeling will come out, right? In fact, this numerical structure By determining the distance between our eyes and the screen, a virtual 3D illusion is constructed.

transform-style

Perspective is here again, yes, it is the key to 3D in CSS. Transform-style defaults to flat. If you want to have a 3D effect on the element, just Transform-style: preserve-3d must be used, otherwise it will be just a plane transformation, not a 3D transformation

We have a little understanding of the concept above, let’s start the actual practice!

The first step: html structure

A very simple container wraps a piece-box containing 6 pieces

Second Step: Add the necessary 3D attributes and enter the 3D world

Through the above explanation, you should be familiar with perspective,

/*容器*/
.container {    
    -webkit-perspective: 1000px;    
    -moz-perspective: 1000px;    
    -ms-perspective: 1000px;    
    perspective: 1000px;
}
/*piece盒子*/
 .piece-box {        
      perspective-origin: 50% 50%;        
      -webkit-transform-style: preserve-3d;        
      -moz-transform-style: preserve-3d;       
      -ms-transform-style: preserve-3d;        
      transform-style: preserve-3d;
}

第三步：加入必要的样式

/*容器*/
.container {    
    -webkit-perspective: 1000px;    
    -moz-perspective: 1000px;    
    -ms-perspective: 1000px;    
    perspective: 1000px;
}
/*piece盒子*/
.piece-box {    
     position: relative;    
     width: 200px;    
     height: 200px;    
     margin: 300px auto;    
     perspective-origin: 50% 50%;    
     -webkit-transform-style: preserve-3d;    
     -moz-transform-style: preserve-3d;    
     -ms-transform-style: preserve-3d;    
     transform-style: preserve-3d;
}
/*piece通用样式*/
.piece {    
    position: absolute;    
    width: 200px;    
    height: 200px;    
    background: red;    
    opacity: 0.5;
}
.piece-1 {    
   background: #FF6666;
}
.piece-2 {    
    background: #FFFF00;
}
.piece-3 {    
    background: #006699;
}
.piece-4 {    
    background: #009999;
}
.piece-5 {    
    background: #FF0033;
}
.piece-6 {    
    background: #FF6600;
}

当然，在你完成这步之后你还是只看到一个正方形，也就是我们的piece-6,因为我们的3Dtransform还没开始

第四步：3D变换来袭

首先是实现走马灯，我们先不要让它走，先实现灯部分。

如何实现呢？因为要构成一个圆，圆是360度，而我们有6个piece，那么，很容易想到，我们需要把每一个piece以递增60度的方式rotateY，就变成如下

如何把他们从中心拉开呢？

这里我们还要注意一点，在我们使元素绕Y轴旋转以后，其实X轴和Z轴也会跟着旋转，所所以正方体的每个面的垂直线还是Z轴，我们就只需要改变下translateZ的值,而当translateZ为正的时候，就朝着我们的方向走来，这样就可以拉开了

但是拉开的距离如何衡量？

是不是一目了然了~

下面我们再修改下css

.piece-1 {    
    background: #FF6666;    
    -webkit-transform: rotateY(0deg) translateZ(173.2px);    
    -ms-transform: rotateY(0deg) translateZ(173.2px);    
    -o-transform: rotateY(0deg) translateZ(173.2px);    
    transform: rotateY(0deg) translateZ(173.2px);

}
.piece-2 {    
    background: #FFFF00;    
    -webkit-transform: rotateY(60deg) translateZ(173.2px);    
    -ms-transform: rotateY(60deg) translateZ(173.2px);    
    -o-transform: rotateY(60deg) translateZ(173.2px);    
    transform: rotateY(60deg) translateZ(173.2px);
}
.piece-3 {    
    background: #006699;    
    -webkit-transform: rotateY(120deg) translateZ(173.2px);    
    -ms-transform: rotateY(120deg) translateZ(173.2px);    
    -o-transform: rotateY(120deg) translateZ(173.2px);    
    transform: rotateY(120deg) translateZ(173.2px);
}
.piece-4 {    
    background: #009999;    
    -webkit-transform: rotateY(180deg) translateZ(173.2px);    
    -ms-transform: rotateY(180deg) translateZ(173.2px);    
    -o-transform: rotateY(180deg) translateZ(173.2px);    
    transform: rotateY(180deg) translateZ(173.2px);
}
.piece-5 {    
    background: #FF0033;    
    -webkit-transform: rotateY(240deg) translateZ(173.2px);    
    -ms-transform: rotateY(240deg) translateZ(173.2px);    
    -o-transform: rotateY(240deg) translateZ(173.2px);    
    transform: rotateY(240deg) translateZ(173.2px);
}
.piece-6 {    
    background: #FF6600;    
    -webkit-transform: rotateY(300deg) translateZ(173.2px);    
    -ms-transform: rotateY(300deg) translateZ(173.2px);    
    -o-transform: rotateY(300deg) translateZ(173.2px);    
    transform: rotateY(300deg) translateZ(173.2px);
}

是不是已经实现了走马灯了？

第五步：animation让3D动起来

要实现走马灯动，其实很简单，我们只要在piece-box上加上旋转动画就行了,5s完成动画，从0度旋转到360度

/*piece盒子*/
.piece-box {    
    position: relative;    
    width: 200px;    
    height: 200px;    
    margin: 300px auto;    
    perspective-origin: 50% 50%;    
    -webkit-transform-style: preserve-3d;    
    -moz-transform-style: preserve-3d;    
    -ms-transform-style: preserve-3d;    
    transform-style: preserve-3d;    
    animation: pieceRotate 5s;    
    -moz-animation: pieceRotate 5s; /* Firefox */
    -webkit-animation: pieceRotate 5s; /* Safari and Chrome */
    -o-animation: pieceRotate 5s ; /* Opera */
}
/*走马灯动画*/
@keyframes pieceRotate
{
0%   {-webkit-transform: rotateY(0deg);        
         -ms-transform: rotateY(0deg);        
         -o-transform: rotateY(0deg);        
         transform: rotateY(0deg);}
100% {-webkit-transform: rotateY(360deg);        
       -ms-transform: rotateY(360deg);        
       -o-transform: rotateY(360deg);        
       transform: rotateY(360deg);}
}
/* Firefox */
@-moz-keyframes pieceRotate
{
0%   {-webkit-transform: rotateY(0deg);        
         -ms-transform: rotateY(0deg);        
         -o-transform: rotateY(0deg);        
         transform: rotateY(0deg);}
100% {-webkit-transform: rotateY(360deg);        
       -ms-transform: rotateY(360deg);        
       -o-transform: rotateY(360deg);        
       transform: rotateY(360deg);}
}
/* Safari and Chrome */
@-webkit-keyframes pieceRotate
{
0%   {-webkit-transform: rotateY(0deg);        
         -ms-transform: rotateY(0deg);        
         -o-transform: rotateY(0deg);        
         transform: rotateY(0deg);}
100% {-webkit-transform: rotateY(360deg);        
       -ms-transform: rotateY(360deg);        
       -o-transform: rotateY(360deg);        
       transform: rotateY(360deg);}
}
/* Opera */
@-o-keyframes pieceRotate
{
0%   {-webkit-transform: rotateY(0deg);        
         -ms-transform: rotateY(0deg);        
         -o-transform: rotateY(0deg);        
         transform: rotateY(0deg);}
100% {-webkit-transform: rotateY(360deg);        
       -ms-transform: rotateY(360deg);        
       -o-transform: rotateY(360deg);        
       transform: rotateY(360deg);}
}

还没结束哦~更酷炫的正方体组装

正方体，其实也不难实现，我这里就不很详细说了，你首先可以想象一个面，然后去拓展其他面如何去实现，比如我们把正方体的前面translateZ(100px）让它靠近我们100px,然后后面translateZ(-100px）让它远离我们100px,左边是先translateX(-100px再rotateY(90deg),右边就是translateX(100px)再rotateY(90deg),上面是先translateY(-100px)，rotateX(90deg)，下面是先translateY(100px)，rotateX(90deg)，只要我们写进动画，一切就大功告成。

css就为如下，以下就只放piece1，其他读者可以自己类比实现

.piece-1 {     
     background: #FF6666;     
     -webkit-transform: rotateY(0deg) translateZ(173.2px);     
     -ms-transform: rotateY(0deg) translateZ(173.2px);     
     -o-transform: rotateY(0deg) translateZ(173.2px);     
     transform: rotateY(0deg) translateZ(173.2px);     
     animation: piece1Rotate 5s 5s;     
     -moz-animation: piece1Rotate 5s 5s; /* Firefox */
     -webkit-animation: piece1Rotate 5s 5s; /* Safari and Chrome */
     -o-animation: piece1Rotate 5s 5s; /* Opera */
     -webkit-animation-fill-mode: forwards; /* Chrome, Safari, Opera */
      animation-fill-mode: forwards;
 }
 /*front*/
 @keyframes piece1Rotate
 {
 0%   {-webkit-transform: rotateY(0deg) translateZ(173.2px);     
       -ms-transform: rotateY(0deg) translateZ(173.2px);     
       -o-transform: rotateY(0deg) translateZ(173.2px);     
       transform: rotateY(0deg) translateZ(173.2px);}
 100% {-webkit-transform: rotateY(0deg)  translateZ(100px);     
       -ms-transform:  rotateY(0deg) translateZ(100px);     
       -o-transform: rotateY(0deg)  translateZ(100px);     
       transform:  rotateY(0deg) translateZ(100px);}
 }
  /* Firefox */
 @-moz-keyframes piece1Rotate
 {
 0%   {-webkit-transform: rotateY(0deg) translateZ(173.2px);     
       -ms-transform: rotateY(0deg) translateZ(173.2px);     
       -o-transform: rotateY(0deg) translateZ(173.2px);     
       transform: rotateY(0deg) translateZ(173.2px);}
 100% {-webkit-transform: rotateY(0deg)  translateZ(100px);     
       -ms-transform:  rotateY(0deg) translateZ(100px);     
       -o-transform: rotateY(0deg)  translateZ(100px);     
       transform:  rotateY(0deg) translateZ(100px);}
 }
  /* Safari and Chrome */
 @-webkit-keyframes piece1Rotate
 {
 0%   {-webkit-transform: rotateY(0deg) translateZ(173.2px);     
       -ms-transform: rotateY(0deg) translateZ(173.2px);     
       -o-transform: rotateY(0deg) translateZ(173.2px);     
       transform: rotateY(0deg) translateZ(173.2px);}
 100% {-webkit-transform: rotateY(0deg)  translateZ(100px);     
       -ms-transform:  rotateY(0deg) translateZ(100px);     
       -o-transform: rotateY(0deg)  translateZ(100px);     
       transform:  rotateY(0deg) translateZ(100px);}
 }
  /* Opera */
 @-o-keyframes piece1Rotate
 {
 0%   {-webkit-transform: rotateY(0deg) translateZ(173.2px);     
       -ms-transform: rotateY(0deg) translateZ(173.2px);     
       -o-transform: rotateY(0deg) translateZ(173.2px);     
       transform: rotateY(0deg) translateZ(173.2px);}
 100% {-webkit-transform: rotateY(0deg)  translateZ(100px);     
       -ms-transform:  rotateY(0deg) translateZ(100px);     
       -o-transform: rotateY(0deg)  translateZ(100px);     
       transform:  rotateY(0deg) translateZ(100px);}
 }

细心的读者可以发现我用了一个animation-fill-mode: forwards;,这个其实就是让这些piece保持动画最后的效果，也就是正方体的效果，读者可以不加试试看，那还是会恢复原样。

最后就是正方体的旋转了，前面我们的容器已经用过animation了,读者可能会想我再加个class放animaiton不就行了，hhh，animaiton会覆盖掉前面的，那前面的走马灯的动画就没了，所以在html结构中，我再加了一个box包裹piece, 如下

在动画上我们可以控制正方体动画的延时时间，就是等到正方体组装完成后再开始动画

animation: boxRotate 5s 10s infinite;第一个5s是动画时长，第二个10s是延时时间，然后我们让正方体的旋转，绕X轴从0度到360度,绕Y轴也0到Y轴360度。

.piece-box2 {
    -webkit-transform-style: preserve-3d;
    -moz-transform-style: preserve-3d;
    -ms-transform-style: preserve-3d;
    transform-style: preserve-3d;
    animation: boxRotate 5s 10s infinite;
    -moz-animation: boxRotate 5s 10s infinite; /* Firefox */
    -webkit-animation: boxRotate 5s 10s infinite; /* Safari and Chrome */
    -o-animation: boxRotate 5s 10s infinite; /* Opera */
}
/*正方体旋转动画*/
@keyframes boxRotate
{
0%   {-webkit-transform: rotateX(0deg) rotateY(0deg););
    -ms-transform: rotateX(0deg) rotateY(0deg););
    -o-transform: rotateX(0deg) rotateY(0deg););
    transform: rotateX(0deg) rotateY(0deg););}
100% {-webkit-transform: rotateX(360deg) rotateY(360deg);
    -ms-transform: rotateX(360deg) rotateY(360deg);
    -o-transform: rotateX(360deg) rotateY(360deg);
    transform: rotateX(360deg) rotateY(360deg);}
}
/* Firefox */
@-moz-keyframes boxRotate
{
0%   {-webkit-transform: rotateX(0deg) rotateY(0deg););
    -ms-transform: rotateX(0deg) rotateY(0deg););
    -o-transform: rotateX(0deg) rotateY(0deg););
    transform: rotateX(0deg) rotateY(0deg););}
100% {-webkit-transform: rotateX(360deg) rotateY(360deg);
    -ms-transform: rotateX(360deg) rotateY(360deg);
    -o-transform: rotateX(360deg) rotateY(360deg);
    transform: rotateX(360deg) rotateY(360deg);}
}
/* Safari and Chrome */
@-webkit-keyframes boxRotate
{
0%   {-webkit-transform: rotateX(0deg) rotateY(0deg););
    -ms-transform: rotateX(0deg) rotateY(0deg););
    -o-transform: rotateX(0deg) rotateY(0deg););
    transform: rotateX(0deg) rotateY(0deg););}
100% {-webkit-transform: rotateX(360deg) rotateY(360deg);
    -ms-transform: rotateX(360deg) rotateY(360deg);
    -o-transform: rotateX(360deg) rotateY(360deg);
    transform: rotateX(360deg) rotateY(360deg);}
}
/* Opera */
@-o-keyframes boxRotate
{
0%   {-webkit-transform: rotateX(0deg) rotateY(0deg););
    -ms-transform: rotateX(0deg) rotateY(0deg););
    -o-transform: rotateX(0deg) rotateY(0deg););
    transform: rotateX(0deg) rotateY(0deg););}
100% {-webkit-transform: rotateX(360deg) rotateY(360deg);
    -ms-transform: rotateX(360deg) rotateY(360deg);
    -o-transform: rotateX(360deg) rotateY(360deg);
    transform: rotateX(360deg) rotateY(360deg);}
}

最后效果，大功告成！