How can I create pure CSS 3-dimensional spheres?

2020-05-12 05:12发布

站内问答 / HTML/CSS
494 7 6

tl;dr: I would like to create an actual 3d sphere with CSS - not just an illusion

Note: some of the snippet examples are not responsive. Please use full screen.

With pure CSS you can create and animate a 3d cube like so:

#cube-wrapper {
  position: absolute;
  left: 50%;
  top: 50%;
  perspective: 1500px;
}

.cube {
  position: relative;
  transform-style: preserve-3d;
  animation-name: rotate;
  animation-duration: 30s;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}

@keyframes rotate {
  0% {
    transform: rotate3d(0, 0, 0, 0);
  }
  100% {
    transform: rotate3d(0, 1, 0, 360deg);
    ;
  }
}

.face {
  position: absolute;
  width: 200px;
  height: 200px;
  border: solid green 3px;
}

#front_face {
  transform: translateX(-100px) translateY(-100px) translateZ(100px);
  background: rgba(255, 0, 0, 0.5);
}

#back_face {
  transform: translateX(-100px) translateY(-100px) translateZ(-100px);
  background: rgba(255, 0, 255, 0.5);
}

#right_face {
  transform: translateY(-100px) rotateY(90deg);
  background: rgba(255, 255, 0, 0.5);
}

#left_face {
  transform: translateY(-100px) translateX(-200px) rotateY(90deg);
  background: rgba(0, 255, 0, 0.5);
}

#top_face {
  transform: translateX(-100px) translateY(-200px) rotateX(90deg);
  background: rgba(0, 255, 255, 0.5);
}

#bottom_face {
  transform: translateX(-100px) rotateX(90deg);
  background: rgba(255, 255, 255, 0.5);
}

.cube {
  transform: rotateX(90deg) rotateY(90deg);
}
<div id="cube-wrapper">
  <div class="cube">
    <div id="front_face" class="face"></div>
    <div id="right_face" class="face"></div>
    <div id="back_face" class="face"></div>
    <div id="left_face" class="face"></div>
    <div id="top_face" class="face"></div>
    <div id="bottom_face" class="face"></div>
  </div>
</div>

I want to create and animate a 3d sphere in the same manner.

So... the first idea I get is to use border-radius and...well... it doesn't work. 

#cube-wrapper {
  position: absolute;
  left: 50%;
  top: 50%;
  perspective: 1500px;
}

.cube {
  position: relative;
  transform-style: preserve-3d;
  animation-name: rotate;
  animation-duration: 30s;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}

@keyframes rotate {
  0% {
    transform: rotate3d(0, 0, 0, 0);
  }
  100% {
    transform: rotate3d(0, 1, 0, 360deg);
   
    ;
  }
}


.face {
  position: absolute;
  width: 200px;
  height: 200px;
  border: solid green 3px;
  border-radius: 100vw
}


 

#front_face {
  transform: translateX(-100px) translateY(-100px) translateZ(100px);
  background: rgba(255, 0, 0, 0.5);
}

#back_face {
  transform: translateX(-100px) translateY(-100px) translateZ(-100px);
  background: rgba(255, 0, 255, 0.5);
}

#right_face {
  transform: translateY(-100px) rotateY(90deg);
  background: rgba(255, 255, 0, 0.5);
}

#left_face {
  transform: translateY(-100px) translateX(-200px) rotateY(90deg);
  background: rgba(0, 255, 0, 0.5);
}

#top_face {
  transform: translateX(-100px) translateY(-200px) rotateX(90deg);
  background: rgba(0, 255, 255, 0.5);
}

#bottom_face {
  transform: translateX(-100px) rotateX(90deg);
  background: rgba(255, 255, 255, 0.5);
}

.cube {
  transform: rotateX(90deg) rotateY(90deg);
}
<div id="cube-wrapper">
  <div class="cube">
    <div id="front_face" class="face"></div>
    <div id="right_face" class="face"></div>
    <div id="back_face" class="face"></div>
    <div id="left_face" class="face"></div>
    <div id="top_face" class="face"></div>
    <div id="bottom_face" class="face"></div>
  </div>
</div>

So, I reconsidered my approach and looked for a different method.

I looked at:

Then I tried again...the best I got were overly complicated 3d object illusions.

Like this:

body {
  overflow: hidden;
  background: #333;
}

.wrapper {
  margin: 1em;
  animation-duration: 20s;
}

.planet,
.planet:before,
.planet:after {
  height: 300px;
  width: 300px;
  border-radius: 100vw;
  will-change: transform;
  margin: 0 auto;
}

.planet {
  box-shadow: inset 0px 0px 10px 10px rgba(0, 0, 0, 0.4);
  position: relative;
}

.wrapper,
.planet,
.planet:before {
  animation-name: myrotate;
  animation-duration: 20s;
}

.wrapper,
.planet,
.planet:before,
.planet:after {
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}

.planet:before,
.planet:after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
}

.planet:before {
  box-shadow: inset 20px 20px 100px 00px rgba(0, 0, 0, .5), 0px 0px 5px 3px rgba(0, 0, 0, .1);
}

.planet:after {
  filter: saturate(2.5);
  background: linear-gradient(rgba(0, 0, 0, 1), transparent), url("https://i.stack.imgur.com/eDYPN.jpg");
  opacity: 0.3;
  box-shadow: inset -20px -20px 14px 2px rgba(0, 0, 0, .2);
  animation-name: myopacity;
  animation-duration: 5000000s;
}

@keyframes myrotate {
  0% {
    transform: rotatez(0deg);
  }
  100% {
    transform: rotatez(360deg);
  }
}

@keyframes myopacity {
  0% {
    background-position: 0px;
    transform: rotatez(0deg);
  }
  50% {
    background-position: 100000000px;
  }
  100% {
    background-position: 0;
    transform: rotatez(-360deg);
  }
}
<div class="wrapper">
  <div class="planet"></div>
</div>

And this:

body {
  background: #131418;
}

.wrapper {
  margin: 1em;
  max-width: 100%;
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

.planet,
.planet:before,
.planet:after {
  height: 500px;
  width: 500px;
  max-height: 30vw;
  max-width: 30vw;
  border-radius: 100vw;
  will-change: transform;
}

.planet {
  box-shadow: inset 0px 0px 100px 10px rgba(0, 0, 0, .5);
  position: relative;
  float: left;
  margin: 0 2em;
}

.planet,
.planet:before,
.planet:after {
  animation-name: myrotate;
  animation-duration: 10s;
}

.wrapper,
.planet,
.planet:before,
.planet:after {
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}

.planet:before,
.planet:after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
}

.planet:before {
  box-shadow: inset 50px 100px 50px 0 rgba(0, 0, 0, .5), 0 0 50px 3px rgba(0, 0, 0, .25);
  background-image: -webkit-radial-gradient( top, circle cover, #ffffff 0%, #000000 80%);
  opacity: .5;
}

.planet:after {
  opacity: .3;
  background-image: -webkit-radial-gradient( bottom, circle, #ffffff 0%, #000000 -200%);
  box-shadow: inset 0px 0px 100px 50px rgba(0, 0, 0, .5);
}

@keyframes myrotate {
  0% {
    transform: rotatez(0deg);
  }
  100% {
    transform: rotatez(-360deg);
  }
}

.bg {
  background: wheat;
}
<div class="wrapper">
  <div class="planet bg"></div>
</div>

Which are okay until you try to actually rotate them on either the x-axis or the y-axis like the cube in my first example...here's what happens then: (simplified example)

.sphere {
  background: black;
  width: 300px;
  height: 300px;
  border-radius: 100vw;
  animation: myrotate 10s linear infinite
}

@keyframes myrotate {
  0% {
    transform: rotate3d(0, 0, 0, 0);
  }
  100% {
    transform: rotate3d(0, 1, 0, 360deg);
  }
}
<div class="sphere"></div>

All you get is a flat 2d object - which is expeceted considering that it's what the element is

The closest thing I found is the following shape created in a tutorial by Timo Korinth 

@-webkit-keyframes animateWorld {
  0% {
    -webkit-transform: rotateY(0deg) rotateX(0deg) rotateZ(0deg);
  }
  50% {
    -webkit-transform: rotateY(360deg) rotateX(180deg) rotateZ(180deg);
  }
  100% {
    -webkit-transform: rotateY(720deg) rotateX(360deg) rotateZ(360deg);
  }
}

html {
  background: #FFFFFF;
}

. world {
  -webkit-perspective: 1000px;
}

.cube {
  margin-left: auto;
  margin-right: auto;
  position: relative;
  width: 200px;
  height: 200px;
  -webkit-transform-style: preserve-3d;
  -webkit-animation-name: animateWorld;
  -webkit-animation-duration: 10s;
  -webkit-animation-iteration-count: infinite;
  -webkit-animation-timing-function: linear;
}

.circle {
  position: absolute;
  width: 100%;
  height: 100%;
  border: 2px dashed #009BC2;
  border-radius: 50%;
  opacity: 0.8;
  background: rgba(255, 255, 255, 0);
}

.zero {
  -webkit-transform: rotateX(90deg);
}

.two {
  -webkit-transform: rotateY(45deg);
}

.three {
  -webkit-transform: rotateY(90deg);
}

.four {
  -webkit-transform: rotateY(135deg);
}

.five {
  width: 173px;
  height: 173px;
  margin: 14px;
  -webkit-transform: rotateX(90deg) translateZ(50px);
}

.six {
  width: 173px;
  height: 173px;
  margin: 14px;
  -webkit-transform: rotateX(90deg) translateZ(-50px);
}
<div class="world">
  <div class="cube">
    <div class="circle zero"></div>
    <div class="circle one"></div>
    <div class="circle two"></div>
    <div class="circle three"></div>
    <div class="circle four"></div>
    <div class="circle five"></div>
    <div class="circle six"></div>
  </div>
</div>

So here's my

Question:

How do I create an actual 3 dimensional sphere with pure CSS? More specifically, one that is covered - not just a frame - and doesn't involve hundreds of html elements.

Notes:

  1. Three dimensional spheres have height, width and depth - just like the cube in my first example snippet
  2. I don't need any physics and there's no need for any user-interaction. Just an animated spinning sphere.

Additional resources:

  1. paulrhayes.com - Spheres
  2. 3d (2d illusion) Earth with Rotating Animation with CSS
  3. Interactive CSS sphere

7条回答
聊天终结者
2楼-- · 2020-05-12 05:18

How do I create an actual 3 dimensional sphere with pure CSS?

Well, as many have stated in answers and comments it is simply impossible to create a single 3D entity in a browser with html and css only at this point in time, but it is possible to create an illusion of a 3D Object. Below is my approach to solving the problem.

To give a human eye the ability to see a spherical object, points of reference are needed for the eye to follow. In my case it is lines that define the shape of the sphere. The lines are achieved by giving a border to 5 elements that are in the X-axis set and 5 elements that are in the Y-axis set. Only X/Y sets are given a border, because that alone provides enough reference to make the illusion of a sphere. Additional lines on the Z axis are simply clutter and are unnecessary. If all lines are turned off, the entire thing appears like a solid "perfect" sphere (Looks like a circle, but all parts of it are moving and are present on the 3D plane in the browser!).

What I have done:

  1. Created 15 html elements that each will represent a circle split in 3 sets of 5

    The reason for all of these sets, is that when the entire contraption is rotated on x, y, z axis the backgrounds of each of the elements in x, y, z sets are filling the empty spaces for each other.

  2. Each set of 5 elements is rotated on X,Y,Z axis respectively in 36 degree increments. enter image description here
  3. All elements are rounded using border-radius:50%; 3 sets of 5 rounded elements for X Y Z axis
  4. Set background of the circle elements to a solid color Filled sets if 5 rounded elements
  5. Put the sets together, so they overlap
    enter image description here
  6. Clipped minor gaps that came as a result of not enough elements covering the empty spaces between x,y,z circles using clip-path: circle(96px at center); on the container, and threw a cool shade/light effect on to seal the deal
    enter image description here vs enter image description here

    More circles will result in a less "edgy" sphere, but since the performance is stressed in the question, a quick clip of the entire thing seemed like the thing to do

As a closing thought, I wanted to express my appreciation of the question being asked, it really made me think and was a great project that lead to me learning a lot of things about 3D capabilities of html/css.

Also thanks to all the people who have spent the time to pry this open, and came up with awesome approaches to the problem.

I hope the fruits of my research are of use. Cheers!

This Pen is also based on Timo Korinth's example. 

* {
  margin: 0;
  padding: 0;
}


/* Rotate Sphere animation */

@-webkit-keyframes animateSphere {
  0% {
    transform: rotateY(0deg) rotateX(0deg) rotateZ(0deg);
  }
  50% {
    transform: rotateY(360deg) rotateX(360deg) rotateZ(0deg);
  }
  100% {
    transform: rotateY(720deg) rotateX(720deg) rotateZ(0deg);
  }
}

html {
  background: black;
}

.scene {
  perspective: 1000px;
}

.container {
  margin-top: 5vh;
  margin-left: auto;
  margin-right: auto;
  position: relative;
  width: 200px;
  height: 200px;
  transform-style: preserve-3d;
  animation-name: animateSphere;
  animation-duration: 30s;
  animation-iteration-count: infinite;
  animation-timing-function: linear;
}

.border {
  border: 1px solid white;
}

.circle {
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: rgba(204, 0, 102, 1);
}

.circle:nth-child(1) {
  transform: rotate3d(1, 0, 0, 0deg);
}

.circle:nth-child(2) {
  transform: rotate3d(1, 0, 0, 36deg);
}

.circle:nth-child(3) {
  transform: rotate3d(1, 0, 0, 72deg);
}

.circle:nth-child(4) {
  transform: rotate3d(1, 0, 0, 108deg);
}

.circle:nth-child(5) {
  transform: rotate3d(1, 0, 0, 144deg);
}


/* 18! difference to align*/

.circle:nth-child(6) {
  transform: rotate3d(0, 1, 0, 0deg);
}

.circle:nth-child(7) {
  transform: rotate3d(0, 1, 0, 36deg);
}


/* Upper and Lower circle */

.circle:nth-child(8) {
  transform: rotate3d(0, 1, 0, 72deg);
}

.circle:nth-child(9) {
  transform: rotate3d(0, 1, 0, 108deg);
}

.circle:nth-child(10) {
  transform: rotate3d(0, 1, 0, 144deg);
}

.circle:nth-child(11) {
  transform: rotate3d(0, 1, 0, 90deg) rotate3d(1, 0, 0, 0deg);
}

.circle:nth-child(12) {
  transform: rotate3d(0, 1, 0, 90deg) rotate3d(1, 0, 0, 36deg);
}


/* Upper and Lower circle */

.circle:nth-child(13) {
  transform: rotate3d(0, 1, 0, 90deg) rotate3d(1, 0, 0, 72deg);
}

.circle:nth-child(14) {
  transform: rotate3d(0, 1, 0, 90deg) rotate3d(1, 0, 0, 108deg);
}

.circle:nth-child(15) {
  transform: rotate3d(0, 1, 0, 90deg) rotate3d(1, 0, 0, 144deg);
}

.shadow {
  margin: auto;
  border-radius: 50%;
  width: 200px;
  height: 200px;
  box-shadow: 10px 1px 30px white;
}


/* Clip the sphere a bit*/

.clip {
  clip-path: circle(96px at center);
}
<div class="scene">
  <div class="shadow">
    <div class="clip">
      <div class="container">
        <div class="circle border"></div>
        <div class="circle border"></div>
        <div class="circle border"></div>
        <div class="circle border"></div>
        <div class="circle border"></div>
        <div class="circle border"></div>
        <div class="circle border"></div>
        <div class="circle border"></div>
        <div class="circle border"></div>
        <div class="circle border"></div>
        <div class="circle"></div>
        <div class="circle"></div>
        <div class="circle"></div>
        <div class="circle"></div>
        <div class="circle"></div>
      </div>
    </div>
  </div>
</div>

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祖国的老花朵
3楼-- · 2020-05-12 05:24

Strictly speaking, any "3D" shape on a flat screen is more an illusion of a 3D object. All we see is a 2D projection of that shape on the screen plane, and our brain does its best to guess which shape could give the projection we see. If the projection changes, our brain interprets it as a 3D object changing its orientation, which helps it to determine the shape of this object better.

It works well with non-symmetric objects and objects made from polygons (e.g., cubes), but the sphere is a very special case: its projection on the plane always gives just a circle. The static sphere and the rotating one have the same projection, the same circle. Even in real life, if we look at a sphere with a uniform surface without any marks on it (e.g., a polished metal ball), it is hard to determine if it stands still or rotates. Our eyes need some hints, some details that are moving along the surface of the sphere according to its geometry. The more such details move the way you expect from points on the spherical surface to move, the clearer is the perception (well, illusion) of the rotating sphere.

And here is the key to the problem in making a CSS scene that would give such perception: to make this illusion strong enough, we need many marks moving along the paths that lie in different planes. And the only way to get this in CSS is to have each mark as a separate CSS box (element or pseudo-element). If our sphere consists only of moving marks, we really need many of them to see it as a sphere — thus "hundreds of elements" in most demos you have seen.

So if you want to make a sphere look realistic with a reasonably small number of elements, you would probably need to combine the effects that make an "illusion" of a static basic spherical shape (a circle with radial gradients, inner shadows etc.) with some elements that are relatively small (to make it less obvious that they are actually flat), oriented along the surface of the sphere with 3D transforms, and animated — basically the same way as the faces of the cube in your first demo.

Below is my own attempt to put this approach into practice. I used 20 circular elements oriented roughly as the faces of the regular icosahedron (like white hexagons on the classic soccer ball). I grouped them into two groups each making one hemisphere for convenience (it was not necessary, but it made styling a bit simpler). The whole 3D scene consists of the sphere itself and the background frame (pseudo element) which crosses the sphere near its centre (a bit closer, to reduce "flickering" of the circles as they go from the near side to the far side and back) and always faces to the screen. So 24 elements in total (not literally "hundreds", at least:). To make the circles look more "bulging" (like spherical segments), I added two pseudo elements to each of them and elevated them slightly one above other. Works best in Chrome and Firefox 57+ (in Firefox 56- and iOS Safari there is still some "flickering" near the edges). If you hover the circle, you can see the scene without the background frame (and also without "flickering"). A slightly modified version is also available on Codepen. 

.scene {
  perspective: 400vmin;
  transform-style: preserve-3d;
  position: absolute;
  width: 80vmin;
  height: 80vmin;
  top: 10vmin;
  left: 10vmin;
}

.sphere {
  transform-style: preserve-3d;
  position: absolute;
  animation: rotate 20s infinite linear;
  width: 100%;
  height: 100%;
  transform-origin: 50% 50%;
  top: 0;
  left: 0;
}

.scene::before {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0%;
  left: 0%;
  background: radial-gradient(circle farthest-corner at 33% 33%, rgba(240, 240, 220, 0.85) 0%, rgba(30, 30, 40, 0.85) 80%), radial-gradient(circle farthest-corner at 45% 45%, rgba(0, 0, 0, 0) 50%, #000000 80%);
  border-radius: 50%;
  transform: translateZ(2vmin);
}

.scene:hover::before {
  display: none;
}

.hemisphere {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transform-origin: 50% 50%;
  transform: rotateX(90deg);
}

.hemisphere:nth-child(2) {
  transform: rotateX(-90deg);
}

.face {
  position: absolute;
  width: 40vmin;
  height: 40vmin;
  background: radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.1) 48%, #ff0000 49%, #ff0000 50%, rgba(0, 0, 0, 0) 51%);
  transform-style: preserve-3d;
  transform-origin: 50% 0;
  top: 50%;
  left: 20vmin;
}

.face::before, .face::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  box-sizing: border-box;
}

.face::before {
  width: 50%;
  height: 50%;
  top: 25%;
  left: 25%;
  border: 2px solid #333;
  background: rgba(255, 255, 255, 0.3);
  transform: translateZ(1.6vmin);
}

.face::after {
  width: 20%;
  height: 20%;
  top: 40%;
  left: 40%;
  background: rgba(0, 0, 0, 0.2);
  transform: translateZ(2.8vmin);
}

.face:nth-child(1) {
  transform: translateZ(-41.6vmin) rotateZ(36deg) translateY(-6.8vmin) rotateX(143deg);
}

.face:nth-child(2) {
  transform: translateZ(-41.6vmin) rotateZ(108deg) translateY(-6.8vmin) rotateX(143deg);
}

.face:nth-child(3) {
  transform: translateZ(-41.6vmin) rotateZ(180deg) translateY(-6.8vmin) rotateX(143deg);
}

.face:nth-child(4) {
  transform: translateZ(-41.6vmin) rotateZ(252deg) translateY(-6.8vmin) rotateX(143deg);
}

.face:nth-child(5) {
  transform: translateZ(-41.6vmin) rotateZ(-36deg) translateY(-6.8vmin) rotateX(143deg);
}

.face:nth-child(6) {
  transform: translateZ(-26.8vmin) rotateZ(36deg) translateY(-33.2vmin) rotateX(100deg);
}

.face:nth-child(7) {
  transform: translateZ(-26.8vmin) rotateZ(108deg) translateY(-33.2vmin) rotateX(100deg);
}

.face:nth-child(8) {
  transform: translateZ(-26.8vmin) rotateZ(180deg) translateY(-33.2vmin) rotateX(100deg);
}

.face:nth-child(9) {
  transform: translateZ(-26.8vmin) rotateZ(252deg) translateY(-33.2vmin) rotateX(100deg);
}

.face:nth-child(10) {
  transform: translateZ(-26.8vmin) rotateZ(-36deg) translateY(-33.2vmin) rotateX(100deg);
}

.face:nth-child(11) {
  transform: translateZ(-26.8vmin) rotateZ(36deg) translateY(-33.2vmin) rotateX(100deg);
}

@keyframes rotate {
  0% {
transform: rotateZ(25deg) rotateX(20deg) rotateY(0deg);
  }
  50% {
transform: rotateZ(-25deg) rotateX(-20deg) rotateY(180deg);
  }
  100% {
transform: rotateZ(25deg) rotateX(20deg) rotateY(360deg);
  }
}

body {
  background: #555;
  overflow: hidden;
}
<div class="scene">
  <div class="sphere">
    <div class="hemisphere">
      <div class="face"></div>
      <div class="face"></div>
      <div class="face"></div>
      <div class="face"></div>
      <div class="face"></div>
      <div class="face"></div>
      <div class="face"></div>
      <div class="face"></div>
      <div class="face"></div>
      <div class="face"></div>
    </div>
    <div class="hemisphere">
      <div class="face"></div>
      <div class="face"></div>
      <div class="face"></div>
      <div class="face"></div>
      <div class="face"></div>
      <div class="face"></div>
      <div class="face"></div>
      <div class="face"></div>
      <div class="face"></div>
      <div class="face"></div>
    </div>
  </div>
</div>

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我欲成王，谁敢阻挡
4楼-- · 2020-05-12 05:30

Here is an example of an animated sphere / bubble, though this example is more of an illusion. I don't know If everything you are asking for is possible through pure css only, but I may be mistaken.

.ball {
  display: inline-block;
  width: 100%;
  height: 100%;
  border-radius: 100%;
  position: relative;
  background: radial-gradient(circle at bottom, #81e8f6, #76deef 10%, #055194 80%, #062745 100%); }
  .ball:before {
    content: "";
    position: absolute;
    top: 1%;
    left: 5%;
    width: 90%;
    height: 90%;
    border-radius: 100%;
    background: radial-gradient(circle at top, white, rgba(255, 255, 255, 0) 58%);
    -webkit-filter: blur(5px);
    filter: blur(5px);
    z-index: 2; }
  .ball:after {
    content: "";
    position: absolute;
    display: none;
    top: 5%;
    left: 10%;
    width: 80%;
    height: 80%;
    border-radius: 100%;
    -webkit-filter: blur(1px);
    filter: blur(1px);
    z-index: 2;
    -webkit-transform: rotateZ(-30deg);
    transform: rotateZ(-30deg); }
  .ball .shadow {
    position: absolute;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.1) 40%, rgba(0, 0, 0, 0) 50%);
    -webkit-transform: rotateX(90deg) translateZ(-160px);
    transform: rotateX(90deg) translateZ(-160px);
    z-index: 1; }
  .ball.plain {
    background: black; }
    .ball.plain:before, .ball.plain:after {
      display: none; }
  .ball.bubble {
    background: radial-gradient(circle at 50% 55%, rgba(240, 245, 255, 0.9), rgba(240, 245, 255, 0.9) 40%, rgba(225, 238, 255, 0.8) 60%, rgba(43, 130, 255, 0.4));
    -webkit-animation: bubble-anim 2s ease-out infinite;
    animation: bubble-anim 2s ease-out infinite; }
    .ball.bubble:before {
      -webkit-filter: blur(0);
      filter: blur(0);
      height: 80%;
      width: 40%;
      background: radial-gradient(circle at 130% 130%, rgba(255, 255, 255, 0) 0, rgba(255, 255, 255, 0) 46%, rgba(255, 255, 255, 0.8) 50%, rgba(255, 255, 255, 0.8) 58%, rgba(255, 255, 255, 0) 60%, rgba(255, 255, 255, 0) 100%);
      -webkit-transform: translateX(131%) translateY(58%) rotateZ(168deg) rotateX(10deg);
      transform: translateX(131%) translateY(58%) rotateZ(168deg) rotateX(10deg); }
    .ball.bubble:after {
      display: block;
      background: radial-gradient(circle at 50% 80%, rgba(255, 255, 255, 0), rgba(255, 255, 255, 0) 74%, white 80%, white 84%, rgba(255, 255, 255, 0) 100%); }

.stage {
  width: 300px;
  height: 300px;
  display: inline-block;
  margin: 20px;
  -webkit-perspective: 1200px;
  -moz-perspective: 1200px;
  -ms-perspective: 1200px;
  -o-perspective: 1200px;
  perspective: 1200px;
  -webkit-perspective-origin: 50% 50%;
  -moz-perspective-origin: 50% 50%;
  -ms-perspective-origin: 50% 50%;
  -o-perspective-origin: 50% 50%;
  perspective-origin: 50% 50%;
}
body {
  width: 300px;
  margin: 20px auto;
  background: linear-gradient(to bottom, rgba(100, 100, 100, 0.2) 0%, rgba(255, 255, 255, 0.5) 40%, #ffffff 100%);
  background-repeat: no-repeat;
}

@-webkit-keyframes bubble-anim {
  0% {
    -webkit-transform: scale(1);
    transform: scale(1); }

  20% {
    -webkit-transform: scaleY(0.95) scaleX(1.05);
    transform: scaleY(0.95) scaleX(1.05); }

  48% {
    -webkit-transform: scaleY(1.1) scaleX(0.9);
    transform: scaleY(1.1) scaleX(0.9); }

  68% {
    -webkit-transform: scaleY(0.98) scaleX(1.02);
    transform: scaleY(0.98) scaleX(1.02); }

  80% {
    -webkit-transform: scaleY(1.02) scaleX(0.98);
    transform: scaleY(1.02) scaleX(0.98); }

  97%, 100% {
    -webkit-transform: scale(1);
    transform: scale(1); } }

@keyframes bubble-anim {
  0% {
    -webkit-transform: scale(1);
    transform: scale(1); }

  20% {
    -webkit-transform: scaleY(0.95) scaleX(1.05);
    transform: scaleY(0.95) scaleX(1.05); }

  48% {
    -webkit-transform: scaleY(1.1) scaleX(0.9);
    transform: scaleY(1.1) scaleX(0.9); }

  68% {
    -webkit-transform: scaleY(0.98) scaleX(1.02);
    transform: scaleY(0.98) scaleX(1.02); }

  80% {
    -webkit-transform: scaleY(1.02) scaleX(0.98);
    transform: scaleY(1.02) scaleX(0.98); }

  97%, 100% {
    -webkit-transform: scale(1);
    transform: scale(1); } }


  
<section class="stage">
      <figure class="ball bubble"></figure>
</section>

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兄弟一词,经得起流年.
5楼-- · 2020-05-12 05:32

Making a realistic 3d css sphere, without some level of 2d illusion, would require many elements for it to have a smooth perimeter.

However, I made a version of Timo Korinth's example with:

  • Clipping of the "back facing" grid lines
  • Approximate spherical shading by moving a radial gradient

Can be rotated arbitrarily as long as the shading animation is recalculated.

This page has some of the maths behind implementing spherical shading with CSS that could be used for this.

Edit: Other answers look nicer, so converted it to a Death Star

.ball {
  position: absolute;
  top:0px;
  left:0px;
  width: 98vmin;
  height: 98vmin;
  margin: 1vmin;  
  transform-style: preserve-3d;  
  transform: rotateX(-5deg);
}

@keyframes rot{
  0% { transform: rotateY(0deg) rotateX(0deg) rotateZ(0deg); }
  100% { transform: rotateY(360deg) rotateX(0deg) rotateZ(0deg); }
}

.layer {
  position: absolute;
  top: 0px;
  left: 0px;
  width: 98vmin;
  height: 98vmin;
}

.moving
{
  transform-style: preserve-3d;
  transform-origin: 49vmin 49vmin;
  animation: rot 10s linear infinite;
}

.gridplane {
  width: 97vmin;
  height: 97vmin;       
  border-radius: 50%;
  border: 0.5vmin dashed rgb(128, 128, 128);
}

.xline { transform: translateY(1%) rotateX(90deg); }
.xline2 { transform: translateY(-1%) rotateX(90deg); }
.yline { transform: rotateY(90deg); }
.zline { transform: rotateZ(90deg); }

.laser { 
  background-color: rgba(0, 0, 0, 0.05);
  transform:  translateX(-27.7128%) translateY(-27.7128%) rotateY(90deg) translateX(-27.7128%) rotateY(-135deg) rotateX(45deg) scale(0.3) translateY(-25%);
}

.laser2 { 
  background-color: rgba(0, 0, 0, 0.05);
  transform:  translateX(-27.0128%) translateY(-27.0128%) rotateY(90deg) translateX(-27.0128%) rotateY(-135deg) rotateX(45deg) scale(0.2) translateY(-35%);
}

.clip
{
  border-radius: 50%;  
  overflow:hidden;
  transform: translateZ(-0vmin);
}

@keyframes highlightanim {     
  0.00% {left: -150.00%; top: -178.00% }
  12.50% {left: -117.67%; top: -179.64% }
  25.00% {left: -97.69%; top: -195.87% }
  28.75% {left: -95.00%; top: -207.09% }
  32.50% {left: -97.69%; top: -220.70% }
  40.00% {left: -117.67%; top: -240.01% }
  47.50% {left: -150.00%; top: -247.50% }
  55.00% {left: -182.33%; top: -240.01% }
  62.50% {left: -202.31%; top: -220.70% }
  68.75% {left: -205.00%; top: -207.09% }
  75.00% {left: -202.31%; top: -195.87% }
  87.50% {left: -182.33%; top: -179.64% }
  100.00% {left: -150.00%; top: -178.00% }
}     
    
.shade
{
  position: relative;
  top: -150%;
  left: -150%;
  width: 400%;
  height: 400%;
  background: radial-gradient(at 50% 50%, white, black, grey, black, black);
  animation: highlightanim 10s linear infinite;
}
<div class='ball'>
  <div class='layer moving'>
    <div class='layer gridplane xline'></div>
    <div class='layer gridplane xline2'></div>
    <div class='layer gridplane yline'></div>   
    <div class='layer gridplane zline'></div>  
    <div class='layer gridplane laser'></div>  
    <div class='layer gridplane laser2'></div>  
  </div> 
  <div class='layer clip'>
    <div class='shade'> 
    </div>
  </div>
</div>

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forever°为你锁心
6楼-- · 2020-05-12 05:37

No, it's not possible under your criteria. All examples of 3D stuff using only HTML and CSS have performance issues, because that's not its purpose.

When it comes to heavy graphical effects, HTML and CSS are really bad at it.

The best way to make a real 3D sphere is using WebGL, which is an JavaScript API for creating 3D content.

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▲ chillily
7楼-- · 2020-05-12 05:41

As already mentioned above, CSS3 can't provide you with a real 3d shapes but just with the illusion. A good sphere illusion that use minimum HTML elements and use image as a texture can be done by a combination of what you have done and masking all with CSS shadows.

A nice touch that can make the mask more realistic is the use of the :after pseudo element for creation of an additional spark in shifted location and smaller size. A key thing for a successful effect is to remember that different materials reflect light differently. meaning if you're trying to create a metallic sphere the lighting created by the box-shadow will be different from the lighting of a plastic sphere.

Another nice addition is the use of the :before pseudo element for creation of reflection effect. Adding a premade image of the world on a sphere with some opacity can create a very persuasive effect. notice also with the reflection the material you are trying to create will determine the amount of opacity you want for the reflection.

Notice, I used octagonal prism for having the image behind the scene to look more round when the 3d trasform apply its perspective. Even with using only 8 elements the result is quite realistic. More realistic result can be done with more polygons and more complex shapes and texture mappings but even then no need for too many elements due to the addition of the shadow and the spark above everything.

Last, in order to hide the rest of the octagonal prism and display only the parts inside the sphere bounds I'm using clip-path: circle(99px at center);.

body {
  width: 100%;
  height: 100%;
  background-color: #000; 
}
.cube-wrapper {
  width: 0;
  height: 0;
  top: 100px;
  left: 100px;
  position: absolute;
  perspective-origin: 0 0;
  perspective: 80px;
}
.cube-2 {
  transform: translateZ(-100px) scaleX(1.8);
  transform-style: preserve-3d;
}
.cube {
  top: -100px;
  position: relative;
  transform-style: preserve-3d;
  animation-name: rotate;
  animation-duration: 10s;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}
@keyframes rotate {
  0% {
    transform: rotate3d(0 0, 0, 360deg);
  }
  100% {
    transform: rotate3d(0, 1, 0, 360deg);
    ;
  }
}

.face {
  position: absolute;
  background-size: 662.4px 200px;
  width: 84px;
  height: 200px;
}

#face1 {
  transform: translateX(-41.4px) translateZ(100px);
  background-position: 0 0;
}
#face2 {
  transform: translateX(29.2px) translateZ(70.8px) rotateY(45deg);
  background-position: -82.8px 0;
}
#face3 {
  transform: translateX(58.5px) rotateY(90deg);
  background-position: -165.6px 0;
}
#face4 {
  transform: translateX(29.2px) translateZ(-70.8px) rotateY(135deg);
  background-position: -248.4px 0;
}
#face5 {
  transform: translateX(-41.4px) translateZ(-100px) rotateY(180deg);
  background-position: -331.2px 0;
}
#face6 {
  transform: translateX(-111.4px) translateZ(-70.8px) rotateY(225deg);
  background-position: -414px 0;
}
#face7 {
  transform: translateX(-141.4px) rotateY(270deg);
  background-position: -496.8px 0;
}
#face8 {
  transform: translateX(-111.4px) translateZ(70px) rotateY(315deg);
  background-position: -579.6px 0;
}

.circle {
  position: absolute;
  width: 200px;
  height: 200px;
  border-radius: 50%;
}
.clip-circle {
  position: absolute;
  padding: 0;
  top: -16px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  clip-path: circle(99px at center);
}
.lighting:after {
    content: '';
    position: absolute;
    top: 50px;
    left: 67px;
}
.reflection:before {
    content: '';
    position: absolute;
    top: 0px;
    left: 0px;
    height: 200px;
    width: 200px;
    background-image:url(https://i.stack.imgur.com/ayCw7.png);
    background-size: 200px 200px;
}

.earth {
  position: absolute;
  left: 20px;
}
.earth .face{
  background-image:url(https://i.stack.imgur.com/fdtNz.jpg);
}
.earth .clip-circle {
  transform: rotateX(7deg) rotateZ(15deg);
}
.earth .lighting {
  box-shadow: -20px -30px 55px 0 rgba(0, 0, 0, 0.9) inset, -75px -100px 150px 0 rgba(0, 0, 0, 0.4) inset, 75px 100px 200px 0 rgba(255, 255, 255, 0.2) inset, -1px -2px 10px 2px rgba(200, 190, 255, 0.2);
}
.earth .lighting:after {
    box-shadow: 0 0 150px 51px rgba(255, 255, 255, 0.2), 0 0 26px 10px rgba(255, 255, 255, 0.2);
}

.wood {
  position: absolute;
  left: 240px;
}
.wood .face{
  background-image:url(https://i.stack.imgur.com/sa5P8.jpg);
}
.wood .cube-wrapper {
  transform: rotateZ(45deg);
}
.wood .lighting {
  box-shadow: -20px -30px 90px 0 rgba(0, 0, 0, 0.7) inset, -75px -100px 140px 0 rgba(0, 0, 0, 0.6) inset;
}
.wood .lighting:after {
    box-shadow: 0 0 42px 15px rgba(255, 255, 255, 0.5);
}
.wood .reflection:before {
    opacity: 0.04;
}

.metal {
  position: absolute;
  left: 460px;
}
.metal .face{
  background-image:url(https://i.stack.imgur.com/PGmVN.jpg);
}
.metal .cube-wrapper {
  transform: rotateZ(-32deg);
}
.metal .lighting {
  box-shadow: -20px -30px 100px 0 rgba(0, 0, 0, 0.9) inset, -75px -100px 107px 0 rgba(0, 0, 0, 0.3) inset, 75px 100px 127px 0 rgba(255, 255, 255, 0.23) inset;
}
.metal .lighting:after {
    box-shadow: 0 0 42px 20px rgba(255, 255, 255, 0.7), 0 0 7px 6px rgba(255, 255, 255, 0.9);
}
.metal .reflection:before {
    opacity: 0.2;
}
<body>
  <div style="position:absolute;top:20px;">
    <div class="earth">
      <dir class="clip-circle">
        <div class="cube-wrapper">
          <div class="cube-2">
            <div class="cube">
              <div id="face1" class="face"></div>
              <div id="face2" class="face"></div>
              <div id="face3" class="face"></div>
              <div id="face4" class="face"></div>
              <div id="face5" class="face"></div>
              <div id="face6" class="face"></div>
              <div id="face7" class="face"></div>
              <div id="face8" class="face"></div>
            </div>
          </div>
        </div>
      </dir>
      <div class="circle lighting"></div>
    </div>
    <div class="wood">
      <dir class="clip-circle">
        <div class="cube-wrapper">
          <div class="cube-2">
            <div class="cube">
              <div id="face1" class="face"></div>
              <div id="face2" class="face"></div>
              <div id="face3" class="face"></div>
              <div id="face4" class="face"></div>
              <div id="face5" class="face"></div>
              <div id="face6" class="face"></div>
              <div id="face7" class="face"></div>
              <div id="face8" class="face"></div>
            </div>
          </div>
        </div>
      </dir>
      <div class="circle reflection lighting"></div>
    </div>
    <div class="metal">
      <dir class="clip-circle">
        <div class="cube-wrapper">
          <div class="cube-2">
            <div class="cube">
              <div id="face1" class="face"></div>
              <div id="face2" class="face"></div>
              <div id="face3" class="face"></div>
              <div id="face4" class="face"></div>
              <div id="face5" class="face"></div>
              <div id="face6" class="face"></div>
              <div id="face7" class="face"></div>
              <div id="face8" class="face"></div>
            </div>
          </div>
        </div>
      </dir>
      <div class="circle reflection lighting"></div>
    </div>
  </div>
  <div style="position:absolute;top:240px">
    <div class="earth">
      <div class="cube-wrapper">
        <div class="cube-2">
          <div class="cube">
            <div id="face1" class="face"></div>
            <div id="face2" class="face"></div>
            <div id="face3" class="face"></div>
            <div id="face4" class="face"></div>
            <div id="face5" class="face"></div>
            <div id="face6" class="face"></div>
            <div id="face7" class="face"></div>
            <div id="face8" class="face"></div>
          </div>
        </div>
      </div>
    </div>
    <div class="wood">
        <div class="cube-wrapper">
          <div class="cube-2">
            <div class="cube">
              <div id="face1" class="face"></div>
              <div id="face2" class="face"></div>
              <div id="face3" class="face"></div>
              <div id="face4" class="face"></div>
              <div id="face5" class="face"></div>
              <div id="face6" class="face"></div>
              <div id="face7" class="face"></div>
              <div id="face8" class="face"></div>
            </div>
          </div>
        </div>
    </div>
    <div class="metal">
        <div class="cube-wrapper">
          <div class="cube-2">
            <div class="cube">
              <div id="face1" class="face"></div>
              <div id="face2" class="face"></div>
              <div id="face3" class="face"></div>
              <div id="face4" class="face"></div>
              <div id="face5" class="face"></div>
              <div id="face6" class="face"></div>
              <div id="face7" class="face"></div>
              <div id="face8" class="face"></div>
            </div>
          </div>
        </div>
    </div>
  </div>
  <div style="position:absolute;top:460px;">
    <div class="earth">
      <div class="circle lighting"></div>
    </div>
    <div class="wood">
      <div class="circle reflection lighting"></div>
    </div>
    <div class="metal">
      <div class="circle reflection lighting"></div>
    </div>
  </div>

</body>

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