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              canvas
.sky-box
.ground
.gradient
            
          
!
            
              *
	margin: 0
	filter: brightness(150%)

canvas
	width: 100%
	height: 100vh

body 
	background-color: #403
	overflow: hidden
	
.gradient
	width: 100%
	height: 100vh
	background-color: navy
	z-index: 2
	position: fixed
	bottom: 0
	opacity: 0.3

.ground
	z-index: -1
	content: ''
	position: fixed
	height: 50%
	left: -100%
	bottom: -8%
	width: 300% 
	border-radius: 100%
	background-color: #030

.sky-box
	filter: invert(100%)
	z-index: -1
	height: 100%
	width: 100%
	top: 0
	left: 0
	background: url(https://www.joshmorony.com/wp-content/uploads/2016/04/mountains-back.png) 0% 0% fixed repeat-x
	background-size: 200% 40%
	position: fixed
            
          
!
            
              window.onload = () => {
	const CANVAS = document.getElementsByTagName("canvas")[0];
	const SKY_BOX = document.getElementsByClassName("sky-box")[0];
	const CTX = CANVAS.getContext("2d");
	const SENSITIVITY = 0.04;
	const SPRITES = [];
	const CAMERA_INIT = {
		x: 0,
		y: -1.3,
		z: -3
	};
	const ELEMENTS = {
		trees: {
			number: 50,
			range: {
				x: 10,
				y: 0,
				z: 10
			},
			origin: {
				x: 0,
				y: 0,
				z: 0
			},
			urls: [
				"https://goo.gl/gCzXR4",
				"https://goo.gl/DFsMwX",
				"https://goo.gl/JqoxHz",
				"https://goo.gl/9Su5pW",
				"https://goo.gl/YTQwiJ",
				"https://goo.gl/rUQVhu"
			]
		},
		clouds: {
			number: 30,
			range: {
				x: 10,
				y: 0.5,
				z: 10
			},
			origin: {
				x: 0,
				y: 2,
				z: 0
			},
			urls: ["https://goo.gl/HgEjL9"]
		},
		groundItems: {
			number: 20,
			range: {
				x: 10,
				y: 0,
				z: 10
			},
			origin: {
				x: 0,
				y: 0,
				z: 0
			},
			urls: [
				"https://goo.gl/yJGDoR",
				"https://goo.gl/g4N9Lp",
				"https://goo.gl/Agqp41"
			]
		}
	};

	let width, height, camera, imagesToLoad;
	let worldRot = 0;
	let dWorldRot = 0;
	let time = 0;
	let loadedImages = 0;

	class Vector {
		constructor(x, y, z) {
			this.x = x;
			this.y = y;
			this.z = z;
		}
		project() {
			const DZ = height / (camera.z - this.z);
			const PX = (camera.x + this.x) * DZ;
			const PY = (camera.y + this.y) * DZ;
			return {
				x: PX + width / 2,
				y: PY + height / 2,
				dz: DZ,
				z: this.z
			};
		}
		rotate(ang) {
			const COS = Math.cos(ang);
			const SIN = Math.sin(ang);
			const X = this.x;
			const Y = this.y;
			const Z = this.z;
			this.x = X * COS - Z * SIN;
			this.z = X * SIN + Z * COS;
		}
	}

	class Sprite {
		constructor(v, images) {
			this.sz = 2;
			this.v = v;
			this.image = images[(Math.random() * images.length) | 0];
			this.xl = this.image.naturalWidth * this.sz;
			this.yl = this.image.naturalHeight * this.sz;
		}
		rotate(ang) {
			this.v.rotate(ang);
		}
		render() {
			const P = this.v.project();
			const SZ = P.dz / height;
			const X_OFFS = this.xl / 6;
			if (outOfBounds(P.z, P.x + X_OFFS, P.y, this.xl * SZ, this.yl * SZ)) return;
			CTX.beginPath();
			CTX.drawImage(this.image, P.x + X_OFFS, P.y, this.xl * SZ, this.yl * SZ);
			CTX.closePath();
		}
	}

	function outOfBounds(z, x, y, xl, yl) {
		return z <= camera.z || x < 0 || y < 0 || x >= width - xl || y >= height - yl;
	}

	function signedRandom(n) {
		return n * (Math.random() - Math.random());
	}

	const renderSprites = () => {
		SPRITES.sort((a, b) => b.v.z - a.v.z);
		for (let s of SPRITES) {
			s.rotate(dWorldRot);
			s.render();
		}
	};

	const updateSkyBox = () => {
		SKY_BOX.style.backgroundPosition = -(worldRot / Math.PI * 2) * 100 + "%";
	};

	const loop = () => {
		worldRot += dWorldRot;
		CTX.clearRect(0, 0, width, height);
		updateSkyBox();
		renderSprites();
		++time;
		requestAnimationFrame(loop);
	};

	const create = e => {
		for (let i = 0; i < e.number; ++i) {
			const X = e.origin.x + signedRandom(e.range.x);
			const Y = e.origin.y + signedRandom(e.range.y);
			const Z = e.origin.z + signedRandom(e.range.z);
			SPRITES.push(new Sprite(new Vector(X, Y, Z), e.images));
		}
	};

	const go = () => {
		camera = new Vector(CAMERA_INIT.x, CAMERA_INIT.y, CAMERA_INIT.z);
		for (let i in ELEMENTS) create(ELEMENTS[i]);
		loop();
	};

	const setDim = () => {
		width = window.innerWidth;
		height = window.innerHeight;
		CANVAS.width = width;
		CANVAS.height = height;
	};

	const handleLoadImage = () => {
		++loadedImages;
		if (loadedImages === imagesToLoad) go();
	};

	const preload = function(o) {
		o.images = [];
		for (let i = 0; i < o.urls.length; ++i) {
			o.images.push(new Image());
			o.images[o.images.length - 1].src = o.urls[i];
			o.images[o.images.length - 1].addEventListener("load", handleLoadImage);
		}
	};

	const preloadImages = () => {
		imagesToLoad = (() => {
			let total = 0;
			for (let i in ELEMENTS) {
				total += ELEMENTS[i].urls.length;
			}
			return total;
		})();
		for (let i in ELEMENTS) {
			preload(ELEMENTS[i]);
		}
	};

	const handleMouseMove = e => {
		const MOUSE_X = event.clientX - width / 2;
		dWorldRot = -MOUSE_X / width * SENSITIVITY;
	};

	const listen = () => {
		document.addEventListener("mousemove", handleMouseMove, false);
		window.onresize = setDim;
	};

	(() => {
		setDim();
		updateSkyBox();
		preloadImages();
		listen();
	})();
};

            
          
!
999px
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