Transition effects play an important role in each slider and makes them more and more beautiful. The following code provides splitting transition effect for your slider. It means that you should cut your image from its center and put them separately in the source. Then the slider brings the left and right parts from two sides of the page and attach them together. Consider that the slides change either manually or automatically. Enjoy!


HTML
<!-- this script got from www.devanswer.com -->
<div id="container"> <ul id="slides"> <li class="slide"> <div class="slide-partial slide-left"><img src="https://devanswer.com/codes/files/slider-forest-left.jpg"/></div> <div class="slide-partial slide-right"><img src="https://devanswer.com/codes/files/slider-forest-right.jpg"/></div> <h1 class="title"><span class="title-text">Forest</span></h1> </li> <li class="slide"> <div class="slide-partial slide-left"><img src="https://devanswer.com/codes/files/slider-mountain-left.jpg"/></div> <div class="slide-partial slide-right"><img src="https://devanswer.com/codes/files/slider-mountain-right.jpg"/></div> <h1 class="title"><span class="title-text">Mountain</span></h1> </li> <li class="slide"> <div class="slide-partial slide-left"><img src="https://devanswer.com/codes/files/slider-ocean-left.jpg"/></div> <div class="slide-partial slide-right"><img src="https://devanswer.com/codes/files/slider-ocean-right.jpg"/></div> <h1 class="title"><span class="title-text">Ocean</span></h1> </li> <li class="slide"> <div class="slide-partial slide-left"><img src="https://devanswer.com/codes/files/slider-canyon-left.jpg"/></div> <div class="slide-partial slide-right"><img src="https://devanswer.com/codes/files/slider-canyon-right.jpg"/></div> <h1 class="title"><span class="title-text">Canyon</span></h1> </li> <li class="slide"> <div class="slide-partial slide-left"><img src="https://devanswer.com/codes/files/slider-lake-left.jpg"/></div> <div class="slide-partial slide-right"><img src="https://devanswer.com/codes/files/slider-lake-right.jpg"/></div> <h1 class="title"><span class="title-text">Lake</span></h1> </li> </ul> <ul id="slide-select"> <li class="btn prev fa fa-arrow-left"></li> <li class="selector"></li> <li class="selector"></li> <li class="selector"></li> <li class="selector"></li> <li class="selector"></li> <li class="btn next fa fa-arrow-right"></li> </ul> </div> <link href="https://fonts.googleapis.com/css?family=Reem+Kufi" rel="stylesheet"> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/meyer-reset/2.0/reset.min.css"> <link rel='stylesheet prefetch' href='https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css'> <script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.0/jquery.min.js'></script><a style="font-size: 8pt; text-decoration: none" target="_blank" href="http://www.devanswer.com">Developer Code</a>

CSS
* {
  box-sizing: border-box;
}

body {
  background-color: #0c0c0c;
  overflow: hidden;
}

#container {
  position: absolute;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

#slides {
  position: relative;
  width: 100%;
  height: 100%;
}
#slides .slide {
  position: absolute;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  width: 100%;
  height: 100%;
}
#slides .slide .title {
  position: absolute;
  top: calc(50% - 0.5em);
  left: 20px;
  z-index: 2;
  padding-top: 5px;
  font-family: "Reem Kufi", sans-serif;
  font-size: 5em;
  color: white;
  overflow: hidden;
}
#slides .slide .title .title-text {
  display: block;
  -webkit-transform: translateY(1.2em);
          transform: translateY(1.2em);
  -webkit-transition: -webkit-transform 1s ease-in-out;
  transition: -webkit-transform 1s ease-in-out;
  transition: transform 1s ease-in-out;
  transition: transform 1s ease-in-out, -webkit-transform 1s ease-in-out;
}
#slides .slide .slide-partial {
  position: absolute;
  width: 50%;
  height: 100%;
  overflow: hidden;
  -webkit-transition: -webkit-transform 1s ease-in-out;
  transition: -webkit-transform 1s ease-in-out;
  transition: transform 1s ease-in-out;
  transition: transform 1s ease-in-out, -webkit-transform 1s ease-in-out;
}
#slides .slide .slide-partial img {
  position: absolute;
  z-index: 1;
  width: 100%;
  height: 100%;
  -o-object-fit: cover;
     object-fit: cover;
  -webkit-transition: -webkit-transform 1s ease-in-out;
  transition: -webkit-transform 1s ease-in-out;
  transition: transform 1s ease-in-out;
  transition: transform 1s ease-in-out, -webkit-transform 1s ease-in-out;
}
#slides .slide .slide-left {
  top: 0;
  left: 0;
  -webkit-transform: translateX(-100%);
          transform: translateX(-100%);
}
#slides .slide .slide-left img {
  top: 0;
  right: 0;
  -o-object-position: 100% 50%;
     object-position: 100% 50%;
  -webkit-transform: translateX(50%);
          transform: translateX(50%);
}
#slides .slide .slide-right {
  top: 0;
  right: 0;
  -webkit-transform: translateX(100%);
          transform: translateX(100%);
  -webkit-transition-delay: 0.2s;
          transition-delay: 0.2s;
}
#slides .slide .slide-right img {
  top: 0;
  left: 0;
  -o-object-position: 0% 50%;
     object-position: 0% 50%;
  -webkit-transition-delay: 0.2s;
          transition-delay: 0.2s;
  -webkit-transform: translateX(-50%);
          transform: translateX(-50%);
}
#slides .slide.active .title .title-text {
  -webkit-transform: translate(0);
          transform: translate(0);
  -webkit-transition-delay: 0.3s;
          transition-delay: 0.3s;
}
#slides .slide.active .slide-partial, #slides .slide.active .slide-partial img {
  -webkit-transform: translateX(0);
          transform: translateX(0);
}

#slide-select {
  position: absolute;
  bottom: 20px;
  left: 20px;
  z-index: 100;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -ms-flex-pack: distribute;
      justify-content: space-around;
  color: white;
}
#slide-select li {
  position: relative;
  cursor: pointer;
  margin: 0 5px;
}
#slide-select .fa {
  font-size: 1.25em;
  line-height: 1.25em;
}
#slide-select .fa.prev:hover {
  -webkit-transform: translateX(-2px);
          transform: translateX(-2px);
}
#slide-select .fa.next:hover {
  -webkit-transform: translateX(2px);
          transform: translateX(2px);
}
#slide-select .selector {
  height: 14px;
  width: 14px;
  border: 2px solid white;
  border-radius: 50%;
  background-color: transparent;
  -webkit-transition: background-color 0.5s ease-in-out;
  transition: background-color 0.5s ease-in-out;
}
#slide-select .selector.current {
  background-color: white;
}

.codepen-link {
  position: absolute;
  bottom: 20px;
  right: 20px;
  height: 40px;
  width: 40px;
  z-index: 10;
  border-radius: 50%;
  box-sizing: border-box;
  background-image: url("https://s3-us-west-2.amazonaws.com/s.cdpn.io/544318/logo.jpg");
  background-position: center center;
  background-size: cover;
  opacity: 0.5;
  -webkit-transition: all 0.25s;
  transition: all 0.25s;
}
.codepen-link:hover {
  opacity: 0.8;
  box-shadow: 0 2px 6px #0c0c0c;
}
Javascript
/* jshint esversion: 6 */

((window, document, $, undefined) => {

	let $slides, interval,
		$selectors, $btns,
		currentIndex, nextIndex;

	let cycle = (index) => {
		let $currentSlide, $nextSlide,
			$currentSelector, $nextSelector;

		nextIndex = index !== undefined ? index : nextIndex;

		$currentSlide = $($slides.get(currentIndex));
		$currentSelector = $($selectors.get(currentIndex));

		$nextSlide = $($slides.get(nextIndex));
		$nextSelector = $($selectors.get(nextIndex));

		$currentSlide
			.removeClass('active')
			.css('z-index', '0');

		$nextSlide
			.addClass('active')
			.css('z-index', '1');

		$currentSelector.removeClass('current');
		$nextSelector.addClass('current');

		currentIndex = index !== undefined ? nextIndex : currentIndex < $slides.length - 1 ? currentIndex + 1 : 0;
		nextIndex = currentIndex + 1 < $slides.length ? currentIndex + 1 : 0;
	};

	$(() => {
		currentIndex = 0;
		nextIndex = 1;

		$slides = $('.slide');
		$selectors = $('.selector');
		$btns = $('.btn');

		$slides.first().addClass('active');
		$selectors.first().addClass('current');

		interval = window.setInterval(cycle, 6000);

		$selectors.on('click', (e) => {
			let target = $selectors.index(e.target);
			if (target !== currentIndex) {
				window.clearInterval(interval);
				cycle(target);
				interval = window.setInterval(cycle, 6000);
			}
		});

		$btns.on('click', (e) => {
			window.clearInterval(interval);
			if ($(e.target).hasClass('prev')) {
				let target = currentIndex > 0 ? currentIndex - 1 : $slides.length - 1;
				cycle(target);
			} else if ($(e.target).hasClass('next')) {
				cycle();
			}
			interval = window.setInterval(cycle, 6000);
		});
	});

})(this, document, jQuery);