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HTML

              
                - var n = 5;
- var max = 45, val = -max/9;

body.paused(style=`--max: ${max}; --val: ${val}`)
	form
		input#fx(type='range' min=-max max=max value=val)
		label(for='fx')
			span.token--func rotatex
			span.token--punc (
			span.token--arg.token--ang
				span.token--num
				span.token--unit deg
			span.token--punc )
		input#play(type='checkbox')
		label(for='play') Playing
	
	- for(var i = 0; i < 2; i++)
		section.scene(data-typ=i ? 'desired' : 'actual')
			.rot
				.s3d
					- for(var j = 0; j < 4*n; j++)
						.s2d.mid.lat.s3gon(class=j < 2*n ? 'dir' : 'rev')
					- for(var j = 0; j < n; j++)
						.s2d.cup.lat.s3gon.dir
						.s2d.cup.lat.s5gon.dir
					- for(var j = 0; j < n; j++)
						.s2d.cup.lat.s3gon.rev
					.s2d.mid.base(class=`s${2*n}gon`)
					.s2d.cup.base(class=`s${n}gon`)
              
            
!

CSS

              
                $bg: #262626;
$fg: #e7e7e7;
$hl: #f44336;
$fc: #8bc34a;
$gc: #4caf50;

$gap: .5em;
$num: 2.5em;

$thumb-d: 1.25em;
$track-w: 9em;
$track-h: .25em;
$input-h: $thumb-d + 2*$track-h;

$check-d: 1.522em;
$lc: #8bc34a;
$dc: #f44336;

// GEOMETRY
$l: 12.25vmin; // edge length
$n: 5; // base face type (3 = triangular)
// lateral face heights
$h3gon: poly-h($l, 3);
$h5gon: poly-h($l, 5);
// pentagonal diagonal
$d5gon: 2*$l*sin(.5*vx-ang(5));
// base planes
$ba-b0: bc-ang($n); // top base central angle
$ri-b0: in-rad($l, $ba-b0); // top base inradius
$rc-b0: cc-rad($l, $ba-b0); // top base circumradius
$ba-b1: bc-ang(2*$n); // bottom base central angle
$ri-b1: in-rad($l, $ba-b1); // bottom base inradius
$rc-b1: cc-rad($l, $ba-b1); // bottom base circumradius
// mid plane
$rc-m: cc-rad($d5gon, $ba-b0);
// lateral face angles with the vertical
$ax3-mid: to-deg(asin(($rc-b1 - $ri-b1)/$h3gon));
$ax3-cup-dir: to-deg(asin(($ri-b1 - $rc-m)/$h3gon));
$ax3-cup-rev: to-deg(asin(($ri-b0 - $rc-m)/$h3gon));
$ax5: to-deg(asin(($ri-b1 - $rc-b0)/$h5gon));
// heights
$h-mid: cath1($h3gon, $rc-b1 - $ri-b1);
$h-cup: cath1($h5gon, $ri-b1 - $rc-b0);
$h: $h-mid + $h-cup;

// VISUAL
$clst: #ff8a00 #da1b60 #9c27b0;
$flst: 3 $n 2*$n;
$llen: length($flst);

$t: 15s;

@mixin track() {
	width: 100%; height: $track-h;
	border-radius: $track-h;
	background-color: $fg;
	background: radial-gradient(circle at var(--pos) 50%, transparent .5*$thumb-d, $fg 0)
}

@mixin thumb() {
	width: $thumb-d; height: $thumb-d;
	border-radius: 50%;
	transform: scale(calc(1 - var(--nothl)*.39));
	background: $hl;
	filter: grayScale(var(--nothl)) brightness(calc(1 + 1.5*var(--nothl)));
	transition: .3s
}

@mixin poly($n, $ba) {
	--rc: #{cc-rad($l, $ba)};
	--ri: #{in-rad($l, $ba)};
	--poly: #{polygon(get-poly-points($n))};
	
	&:before { --poly: #{polygon(get-poly-points($n, $bw: 2px))} }
}

* { margin: 0; font: inherit }

body {
	--ax: calc(var(--val)*1deg);
	display: flex;
	flex-wrap: wrap;
	overflow: hidden;
	position: relative;
	min-height: 100vh;
	background: #333;
}

.scene {
	box-sizing: border-box;
	flex: 1;
	position: relative;
	border: solid 1em transparent;
	height: calc(100vh - #{2*$input-h} - 1em);
	perspective: 25em;
	box-shadow: inset 0 0 0 1px $fg;

	&:after {
		position: absolute;
		width: 100%;
		font: 900 1.5em/ 2 segoe script, comic sans ms, purisa, cursive;
		text-align: center;
		content: attr(data-typ)
	}
	
	&[data-typ='actual'] {
		--q: 0;
		
		.mid.dir { background: $dc }
		
		&:after { color: $dc }
	}
	
	&[data-typ='desired'] {
		--q: 1;
		
		.mid.dir { background: $lc }
		
		&:after { color: $lc }
	}
}

div {
	position: absolute;
	transform-style: preserve-3d
}

.rot {
	top: 50%; left: 50%;
	transform: rotatex(var(--ax))
}

.s3d {
	transform: rotatey(0turn);
	animation: rot $t linear infinite;
	
	.paused & { animation-play-state: paused }
}

@keyframes rot { 0% { transform: rotatey(1turn) } }

.s2d {
	--vis: calc(.1 + var(--nor));
	--noti: calc(1 - var(--i));
	--sgni: calc(2*var(--i) - 1);
	--notk: calc(1 - var(--k));
	--notp: calc(1 - var(--p));
	--nor: calc((1 - var(--k))*(1 - var(--i)));
	--xor: calc((var(--k) - var(--i))*(var(--k) - var(--i)));
	--and: calc(var(--i)*var(--k));
	--nand: calc(1 - var(--and));
	margin: calc(-1*var(--rc));
	padding: var(--rc);
	-webkit-clip-path: var(--poly);
					clip-path: var(--poly);
	
	&:before, &:after {
		position: absolute;
		top: 0; right: 0; bottom: 0; left: 0;
		content: ''
	}
	
	&:before {
		background: $fg;
		-webkit-clip-path: var(--poly);
						clip-path: var(--poly);
	}
}

.mid { --i: 0 }
.cup { --i: 1 }

.lat {
	--j: calc((1 + var(--and)*var(--q))*var(--idx) + .5*var(--nor)*var(--q));
	--ay: calc(var(--j)*#{$ba-b1});
	--y: calc(var(--nor)*#{.5*$h} + 
						var(--xor)*#{.5*$h - $h-mid} - 
						var(--and)*#{.5*$h});
	--z: calc(var(--and)*#{$ri-b0} + var(--nand)*#{$ri-b1});
	--ax: calc(var(--notp)*(var(--noti)*#{-$ax3-mid} + 
													var(--i)*(var(--notk)*#{$ax3-cup-dir} + 
																		var(--k)*#{$ax3-cup-rev})) +
						 var(--p)*#{$ax5});
	margin-top: calc(-1*(var(--rc) + var(--ri)));
	transform-origin: 50% calc(50% + var(--ri));
	transform: 
		rotatey(var(--ay)) 
		translate3d(0, var(--y), var(--z)) 
		rotate(calc(var(--k)*.5turn)) 
		rotatex(var(--ax));
	
	@for $i from 0 to 2*$n {
		&:nth-child(#{2*$n}n + #{$i + 1}) { --idx: #{$i} }
	}

	&:after {
		display: grid;
		place-content: center;
		transform: rotate(calc(var(--k)*-.5turn));
		opacity: var(--vis);
		color: RGBA(0, 0, 0, var(--nor));
		counter-reset: idx var(--idx);
		content: counter(idx)
	}
}

.base {
	--vis: .2;
	transform: 
		rotatex(calc(var(--sgni)*90deg)) 
		translatez(.5*$h)
		rotate(calc(var(--noti)*#{.5*$ba-b1}));
	opacity: .5
}

@for $i from 0 to $llen {
	$m: nth($flst, $i + 1);
	
	.s#{$m}gon {
		@if $m < 2*$n { --p: #{$i} }
		@include poly($m, bc-ang($m));
		$c: nth($clst, $i + 1);
		background: RGBA(red($c), green($c), blue($c), var(--vis))
	}
}

.dir { --k: 0 }
.rev { --k: 1 }

form {
	--pos: calc(.5*(#{$thumb-d} + (var(--val) + var(--max))/var(--max)*(100% - #{$thumb-d})));
	margin: 0 calc(50vw - #{.5*$track-w}) 0;
	padding: .5em;
	width: $track-w; height: 2*$input-h;
	background: rgba(#000, .5);
	color: $fg;
	font: 1em consolas, monaco, ubuntu mono, monospace
}

input, label {
	--hl: 0;
	--nothl: calc(1 - var(--hl))
}

input:focus, input:focus + label, 
[type='range']:hover, [type='checkbox'] + label:hover { --hl: 1 }

[type='range'] {
	&, &::-webkit-slider-thumb, 
	&::-webkit-slider-runnable-track {
		-webkit-appearance: none
	}
	
	display: block;
	width: 100%; height: $input-h;
	background: none;
	cursor: pointer;
	
	&::-webkit-slider-runnable-track {
		@include track
	}
	
	&::-moz-range-track {
		@include track
	}
	
	&::-webkit-slider-thumb {
		margin-top: .5*($track-h - $thumb-d);
		@include thumb
	}
	
	&::-moz-slider-thumb {
		@include thumb
	}
	
	+ label {
		display: block;
		text-align: center;
		
	}
	
	&:focus { outline: solid 0 transparent }
}

.token {
	&--num {
		counter-reset: fx var(--val);
		
		&:after { content: counter(fx) }
	}
}

[type='checkbox'] {
	left: -100vmax;
	position: absolute;
	
	+ label {
		--check: 0;
		--notcheck: calc(1 - var(--check));
		overflow: hidden;
		position: absolute;
		top: $gap; left: $gap;
		border: solid $gap transparent;
		width: $check-d; height: $check-d;
		border-radius: 5px;
		background: inherit;
		text-indent: -100vw;
		cursor: pointer;
		
		&:before, &:after {
			$hue0: hue($lc);
			$sat0: saturation($lc);
			$lum0: lightness($lc);
			$hue1: hue($dc);
			$sat1: saturation($dc);
			$lum1: lightness($dc);
			
			--q: 0;
			--notq: calc(1 - var(--q));
			position: absolute;
			top: 0; right: 0; bottom: 0; left: 0;
			transform-origin: 100% 50%;
			transform: scalex(calc(1 - var(--notcheck)*.2));
			background: 
			hsl(calc(var(--notcheck)*#{$hue0} + var(--check)*#{$hue1}), 
					calc(var(--notcheck)*#{$sat0} + var(--check)*#{$sat1}), 
					calc(var(--notcheck)*#{$lum0} + var(--check)*#{$lum1}));
			--points: calc(var(--q)*var(--check)*65%) 0, 
								calc(var(--q)*var(--check)*65%) 100%,  
								calc(100% - var(--notq)*var(--check)*65%) calc(100% - var(--notcheck)*50%), 
								calc(100% - var(--notq)*var(--check)*65%) calc(var(--notcheck)*50%);
			-webkit-clip-path: polygon(var(--points));
							clip-path: polygon(var(--points));
			filter: grayScale(var(--nothl));
			transition: .3s;
			content: ''
		}
		
		&:after { --q: 1 }
	}
	
	&:checked + label { --check: 1 }
}
              
            
!

JS

              
                const _BODY = document.body, 
			_PLAY = document.getElementById('play'), 
			_FVAL = document.getElementById('fx');

_PLAY.addEventListener('change', e => {
	_BODY.classList.toggle('paused')
}, false);

_FVAL.addEventListener('input', e => {
	_BODY.style.setProperty('--val', 1*_FVAL.value)
}, false);
              
            
!
999px

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