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              <svg width='0' height='0'>
	<symbol id='basepoly'>
		<polygon/>
	</symbol>
</svg>

<div class='prism'>
	<div class='pos'>
		<div class='prism__face--base'>
			<svg>
				<use xlink:href='#basepoly'/>
			</svg>
		</div>
		<div class='prism__face--base'>
			<svg>
				<use xlink:href='#basepoly'/>
			</svg>
		</div>
	</div>
</div>

<form>
	<fieldset>
    <button id='s0' data-txt='flatten'>flatten</button>
    <button id='s1' data-txt='3D shape'>3D shape </button>
    <input id='k' min='-100' type='range'/>
  </fieldset>
	
	<input type='range' id='n' 
				 min='3' value='5' max='20'/>
	<label for='n'>number of lateral faces</label>
	
	<input type='range' id='h' 
				 min='8' value='32' max='45'/>
	<label for='h'>height</label>
	
	<fieldset class='const'>
		<p>Keep unchanged:</p>
		<div>
			<input type='radio' name='const' id='cr' 
						 value='0' checked/>
			<label for='cr'>base circumradius</label>
		</div>
		<div>
			<input type='radio' name='const' id='l' 
						 value='1'/>
			<label for='l'>base edge length</label>
		</div>
	</fieldset>
	
	<input type='checkbox' id='auto'/>
	<label for='auto'>auto rotate</label>
</form>
            
          
!
            
              $theme-ll: rgba(darken(#d49b00, 39%), .5);
$theme-hl: #e18728;
$easeOutBack: cubic-bezier(.17, .89, .32, 1.28);


*, :before, :after { box-sizing: inherit; }

html, body { height: 100%; }

html {
	box-sizing: border-box;
	overflow: hidden;
	min-width: 15em;
}

/* =============== GEOMETRY =============== */

body {
  margin: 0;
  overflow: hidden;
  perspective: 64em;
  background: #191919;
}

.prism {
	&, div, svg {
		position: absolute;
		top: 50%; left: 50%;
		transform-style: preserve-3d;
		transition: .2s $easeOutBack, 
			transform .4s $easeOutBack;
	}
	
	animation: rot 16s linear infinite;
	animation-play-state: paused;
		
	&__face {
		&--lateral {
			border: solid .5vmin $theme-hl;
			transform-origin: 0 50%;
			background: $theme-ll;
		}
	}
}

.auto-rot {
	animation-play-state: running;
}

@keyframes rot {
	to { transform: rotate(1turn) rotateY(1turn); }
}

.pos {
	/* this is for a 3D look in IE 10-11 */
	-ms-perspective-origin: 50% 10vmin;
	-ms-perspective: 800px;
}

polygon {
	fill: $theme-ll;
	stroke: $theme-hl;
}



/* =============== CONTROLS =============== */


//* CTRL VARS */

$ctrl-bg: #262626;
$ctrl-ll: #aaa;
$ctrl-hl: $theme-hl;

$check-d: 1.25em;

$track-w: 13em;
$track-h: .25em;

$thumb-d: 1.25em;


//* CTRL MIXINS */

@mixin track() {
	width: $track-w; height: $track-h;
	background: $ctrl-ll;
}

@mixin fill() {
	background: $ctrl-hl;
}

@mixin thumb() {
	border: none;
	width: $thumb-d; height: $thumb-d;
	border-radius: 50%;
	background: $ctrl-hl;
}

form {
	position: absolute;
	top: .25em; right: .25em;
	margin: .25em;
	padding: .5em;
	background: $ctrl-bg;
	color: $ctrl-ll;
	font: 1em/1.375em trebuchet ms, sans serif;
	
	p, div { text-align: left; }
	
	p { margin: .375em 0; }
}

fieldset {
	margin: 0 0 .75em;
	border: none;
	box-shadow: inset 0 0 .125em currentColor;
	text-align: center;
	
	&:not(:first-child) { margin-top: .5em; }
}

button {
	overflow: hidden;
	position: relative;
	margin: .5em .125em 0;
	border: none;
	width: 6.25rem; height: 2rem;
	box-shadow: 0 0 0 .125em $ctrl-ll;
	background: transparent;
	color: rgba($ctrl-ll, 0);
	font: inherit;
	line-height: 2;
	transition: .4s ease-out .175s;
	cursor: pointer;
	
	&:before, &:after {
		position: absolute;
		left: 0; right: 0;
		background: $ctrl-ll;
		color: $ctrl-bg;
		transition: .3s ease-out;
		content: attr(data-txt);
	}
	
	&:before { top: 0; bottom: 50%; }
	&:after {
		top: 50%; bottom: 0;
		line-height: 0;
	}
	
	&:hover, &:focus {
		outline: none;
		color: $ctrl-ll;
		
		&:before { transform: translateY(-100%); }
		&:after { transform: translateY(100%); }
	}
	
	&:active {
		color: $ctrl-hl;
		box-shadow: 0 0 0 .125em $ctrl-hl;
	}
}

input[type='checkbox'], input[type='radio'] {
	transform: translate(-100vw);
	
	+ label {
		display: inline-block;
		position: relative;
		color: $ctrl-ll;
		line-height: 2;
		cursor: pointer;
		
		&:hover {
			color: mix($ctrl-ll, $ctrl-hl);
		}
		
		&:before {
			position: absolute;
			top: 50%; right: 100%;
			margin: -$check-d/2 $check-d/4;
			border: solid .125em $ctrl-ll;
			padding: .25em;
			width: $check-d; height: $check-d;
			color: transparent;
			font: 900 1em/.5 sans-serif;
			text-indent: -.125em;
			transition: .3s ease-out;
			content: '✓';
		}
	}
	
	&:focus + label {
		color: mix($ctrl-ll, $ctrl-hl);
	}
	
	&:checked + label {
		&, &:before { color: $ctrl-hl; }
	}
}

input[type='radio'] {	
	+ label {		
		&:before {
			border-radius: 50%;
			background-clip: content-box;
			content: ''
		}
	}
	
	&:checked + label:before {
		background-color: $ctrl-hl;
	}
}

input[type='range'] {
	&, 
	&::-webkit-slider-runnable-track, 
	&::-webkit-slider-thumb {
		-webkit-appearance: none;
	}
	
	display: block;
	margin: 1em auto 0;
	padding: 0;
	width: $track-w; height: 2em;
	background: none;
	font-size: 1em;
	cursor: pointer;
	
	&::-webkit-slider-runnable-track {
		@include track();
	}
	&::-moz-range-track {
		@include track();
	}
	&::-ms-track {
		border: none;
		@include track();
		color: transparent;
	}
	
	&::-moz-range-progress {
		height: $track-h;
		@include fill();
	}
	&::-ms-fill-lower {
		@include fill();
	}
	
	&::-webkit-slider-thumb {
		margin-top: ($track-h - $thumb-d)/2;
		@include thumb();
	}
	&::-moz-range-thumb {
		@include thumb();
	}
	&::-ms-thumb {
		@include thumb();
	}
	
	&::-ms-tooltip { display: none; }
	
	+ label {
		display: block;
		text-align: center;
	}
		
	&:focus { outline: none; }
}

input.hide-me { 
	&, & + label { display: none; }
}
            
          
!
            
              /* because me lazy */
Object.getOwnPropertyNames(Math).map(function(p) {
		window[p] = Math[p];
});

var rs = function(k) {
		return (random() < (k || .5)) ? -1 : 1;
};

Node.prototype.setAttrs = function(attr_obj) {
		for (var prop in attr_obj) {
				this.setAttribute(prop, attr_obj[prop]);
		}
};

var BASE_CR = 13,
		BASE_L = 8,
		VB_R = 1000,
		SW = 32,

		sym = document.getElementById('basepoly'),
		poly = sym.querySelector('polygon'),
		s3d = document.querySelector('.prism'),
		rot3d = true,
		pos = s3d.querySelector('.pos'),
		faces = {
				'lat': [],
				'base': []
		},
		lat_sel = '.prism__face--lateral',
		data = {},
		u = 'vmin',

		form = document.querySelector('form'),
		const_g = form.querySelector('.const'),
		k_el = document.getElementById('k'),
		n_el = document.getElementById('n'),
		h_el = document.getElementById('h'),
		const_sel = '[name=const]:checked',
		const_el,
		auto_el = document.getElementById('auto'),

		style = document.createElement('style'),
		styles = ['', '', ''];

/* no rotation if preserve-3d not supported */
var shapeRotInit = function() {
		var ts = getComputedStyle(s3d).transformStyle;

		if (ts !== 'preserve-3d') {
				auto_el.classList.add('hide-me');
				rot3d = false;
		}
};

var init = function() {
		var b, rtest;

		rtest = document.querySelector('[class*=ms]');

		document.body.appendChild(style);

		sym.setAttribute(
				'viewBox', [-VB_R, -VB_R, 2 * VB_R, 2 * VB_R].join(' ')
		);

		b = s3d.querySelectorAll('[class*=base]');

		for (var i = 0; i < 2; i++) {
				faces.base.push({
						'pos': b[i],
						'rot': b[i].querySelector('svg')
				});

				if (rtest) {
						/* comment next line to test in IE */
						/* hiding appears not to work in Edge :( */
						b[i].style.display = 'none';
						/**/
				}
		}

		update();
};

var update = function() {
		updateNData();
		updateHeight();
};

/* update data */
var updateNData = function() {
		data.n = ~~n_el.value;
		data.centralAngle = 2 * PI / data.n;
		data.polygonAngle = (data.n - 2) * PI / data.n;
		data.sin = sin(.5 * data.centralAngle);
		data.cos = cos(.5 * data.centralAngle)
		data.rCorrection =
				.5 * SW / sin(.5 * data.polygonAngle);
		data.rAdjusted = VB_R - data.rCorrection;

		updateBasePoly();
		updateLateralN();
		updateConstCrit();
		update3dFactor();
};

var updateHeight = function() {
		data.h = ~~h_el.value;

		updateBasePosition();
		updateLatSizing();
};

var updateConstCrit = function() {
		const_el = document.querySelector(const_sel);
		data.const = ~~const_el.value;

		if (!data.const) {
				data.cr = BASE_CR;
				data.l = 2 * data.cr * data.sin;
		} else {
				data.l = BASE_L;
				data.cr = .5 * data.l / data.sin;
		}

		data.ci = data.cr * data.cos;

		updateBaseSizing();
		updateBasePosition();
		updateLatSizing();
		update3dPosition();
};

var update3dFactor = function() {
		data.k = ~~k_el.value * .01;
		data.kAngle = data.k * (PI - data.polygonAngle);

		updateBaseRot();
		updateLatPosition();
		update3dPosition();
};

/* update graphics */
var updateBasePoly = function() {
		var curr_a, x, y, points_txt = '';

		for (var i = 0; i < (data.n || 3); i++) {
				curr_a = (i - .5) * data.centralAngle - .5 * PI;
				x = data.rAdjusted * cos(curr_a);
				y = data.rAdjusted * sin(curr_a);

				points_txt +=
						round(x) + ',' + round(y) + ' ';
		}

		poly.setAttrs({
				'points': points_txt.trim(),
				'stroke-width': SW
		});
};

var updateLateralN = function() {
		var old_nl = faces.lat.length,
				frag, curr_el;

		if (old_nl > data.n) {
				styles[2] =
						lat_sel + ':nth-child(n + ' +
						(data.n + 3) + '){opacity:.001}';
		} else {
				frag = document.createDocumentFragment();
				styles[2] = '';
		}

		style.textContent = styles.join('');

		for (var i = 0; i < data.n; i++) {
				if (i >= old_nl) {
						curr_el = document.createElement('div');
						curr_el.classList.add(
								lat_sel.replace('.', '')
						);
						faces.lat.push(curr_el);
						frag.appendChild(curr_el);
				}
		}

		if (frag) {
				pos.appendChild(frag);
		}
};

var updateBaseSizing = function() {
		styles[0] = '.prism svg{margin:' + -data.cr + u + ';width:' + 2 * data.cr + u + ';height:' + 2 * data.cr + u + ';transform-origin:50% ' + (data.cr - data.ci) + u + '}';
		style.textContent = styles.join('');
};

var updateLatSizing = function() {
		if (data.h && data.l) {
				styles[1] = lat_sel +
						'{margin:' + -.5 * data.h + u + ' ' + -.5 * data.l + u + ';width:' + data.l + u + ';height:' + data.h + u + ';}';
				style.textContent = styles.join('');
		}
};

var updateBasePosition = function() {
		var ttxt = 'translateY(' +
				(.5 * data.h + data.ci) + u + ')';

		faces.base[0].pos.style.transform = ttxt;
		faces.base[1].pos.style.transform =
				'rotate(.5turn)' + ttxt;
};

var updateBaseRot = function() {
		var rot_a = -data.k * .25;

		faces.base[0].rot.style.transform =
				faces.base[1].rot.style.transform =
				'rotateX(' + rot_a + 'turn)';
};

var updateLatPosition = function() {
		var ttxt = '';

		for (var i = 1; i < data.n; i++) {
				ttxt += 'translate(100%)' +
						'rotateY(' + data.kAngle + 'rad)'

				faces.lat[i].style.transform = ttxt;
		}
};

var update3dPosition = function() {
		var x = -.5 * (data.n - 1) * (1 - abs(data.k)) * data.l + u,
				z = data.k * data.ci + u;
		pos.style.transform = 'translate3d(x,0,z)'
				.replace('x', x).replace('z', z);
};

shapeRotInit();
init();

addEventListener('click', function(e) {
		var t = e.target;

		if (t.tagName.toLowerCase() === 'button') {
				e.preventDefault();
				k_el.value = t.id.split('s')[1] * 100 * rs();
				update3dFactor();
		}
}, false);

k_el.addEventListener('input', update3dFactor, false);
k_el.addEventListener('change', update3dFactor, false);

n_el.addEventListener('input', updateNData, false);
n_el.addEventListener('change', updateNData, false);

h_el.addEventListener('input', updateHeight, false);
h_el.addEventListener('change', updateHeight, false);

const_g.addEventListener('click', function(e) {
		if (e.target.tagName.toLowerCase() == 'label') {
				updateConstCrit();
		}
}, false);

auto_el.addEventListener('change', function() {
		s3d.classList.toggle('auto-rot');
}, false);
            
          
!
999px
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