Snow

Developer
Scott R McGann
Size
3,204 Kb
Views
12,144
  1. Snow Previews
  2. Snow HTML Codes
  3. Snow CSS Codes
  4. Snow JS Codes

How do I make an snow?

What is a snow? How do you make a snow? This script and codes were developed by Scott R McGann on 11 November 2022, Friday.

Snow Previews
IQ Test

Snow - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>Snow</title> <link rel="stylesheet" href="css/style.css">
</head>
<body> <script src="js/index.js"></script>
</body>
</html>

Snow - Script Codes CSS Codes

html,body{	margin:0px;	width:100%;	height:100%;	overflow:hidden; background:#000;
}
canvas{	position:absolute;	width:100%;	height:100%; cursor:crosshair;
}

Snow - Script Codes JS Codes

function project3D(x,y,z,vars){	var p,d;	x-=vars.camX;	y-=vars.camY;	z-=vars.camZ;	p=Math.atan2(x,z);	d=Math.sqrt(x*x+z*z);	x=Math.sin(p-vars.yaw)*d;	z=Math.cos(p-vars.yaw)*d;	p=Math.atan2(y,z);	d=Math.sqrt(y*y+z*z);	y=Math.sin(p-vars.pitch)*d;	z=Math.cos(p-vars.pitch)*d;	var rx1=-9;	var ry1=1;	var rx2=9;	var ry2=1;	var rx3=0;	var ry3=0;	var rx4=x;	var ry4=z;	var uc=(ry4-ry3)*(rx2-rx1)-(rx4-rx3)*(ry2-ry1);	var ua=((rx4-rx3)*(ry1-ry3)-(ry4-ry3)*(rx1-rx3))/uc;	var ub=((rx2-rx1)*(ry1-ry3)-(ry2-ry1)*(rx1-rx3))/uc;	if(ua>0&&ua<1&&ub>0&&ub<1){	return {	x:vars.cx+(rx1+ua*(rx2-rx1))*vars.scale,	y:vars.cy+y/z*vars.scale,	d:Math.sqrt(x*x+y*y+z*z)	};	}else{	return { d:-1 };	}
}
function reverseRasterize(depth, vars){	var vert=new Vert(),d,p;	vert.x=vars.camX+(-vars.cx+vars.mx)/vars.scale*depth;	vert.y=vars.camY+(-vars.cy+vars.my)/vars.scale*depth;	vert.z=vars.camZ+depth;	d=Math.sqrt((vert.y-vars.camY)*(vert.y-vars.camY)+(vert.z-vars.camZ)*(vert.z-vars.camZ));	p=Math.atan2(vert.y-vars.camY,vert.z-vars.camZ);	vert.y=vars.camY+Math.sin(p+vars.pitch)*d;	vert.z=vars.camZ+Math.cos(p+vars.pitch)*d;	d=Math.sqrt((vert.x-vars.camX)*(vert.x-vars.camX)+(vert.z-vars.camZ)*(vert.z-vars.camZ));	p=Math.atan2(vert.x-vars.camX,vert.z-vars.camZ);	vert.x=vars.camX+Math.sin(p+vars.yaw)*d;	vert.z=vars.camZ+Math.cos(p+vars.yaw)*d;	d=Math.sqrt((vert.x-vars.camX)*(vert.x-vars.camX)+	(vert.y-vars.camY)*(vert.y-vars.camY)+	(vert.z-vars.camZ)*(vert.z-vars.camZ));	var x = vert.x-vars.camX;	var y = vert.y-vars.camY;	var z = vert.z-vars.camZ;	var t=d/depth;	vert.x=vars.camX+x/t;	vert.y=vars.camY+y/t;	vert.z=vars.camZ+z/t;	return vert;
}
function Vert(x,y,z){	this.x = x;	this.y = y;	this.z = z;
}
function process(vars){	var d=Math.sqrt(vars.camX*vars.camX+vars.camY*vars.camY+vars.camZ*vars.camZ);	vars.point=reverseRasterize(d, vars);	var x,y,z,p;	for(var i=0;i<vars.flakes.length;++i){	x=vars.flakes[i].x;	y=vars.flakes[i].y;	z=vars.flakes[i].z;	d=Math.sqrt((x-vars.point.x)*(x-vars.point.x)+(z-vars.point.z)*(z-vars.point.z));	p=Math.atan2(x-vars.point.x,z-vars.point.z)-(vars.mx-vars.cx)/100000+(vars.my-vars.cy)/100000+y/vars.canvas.height*Math.PI/10+Math.sin(vars.frameNo/100)/200;	vars.flakes[i].x=vars.point.x+Math.sin(p)*d;	vars.flakes[i].z=vars.point.z+Math.cos(p)*d;	vars.flakes[i].y+=.2;	if(vars.flakes[i].y>100){	vars.flakes[i].x=-100+Math.random()*200;	vars.flakes[i].y=-100;	vars.flakes[i].z=-100+Math.random()*200;	}	if(vars.flakes[i].x>100)vars.flakes[i].x=-100;	if(vars.flakes[i].x<-100)vars.flakes[i].x=100;	if(vars.flakes[i].z>100)vars.flakes[i].z=-100;	if(vars.flakes[i].z<-100)vars.flakes[i].z=100;	}
}
function draw(vars){	vars.ctx.globalAlpha=.35;	vars.ctx.drawImage(vars.scene,0,0,vars.canvas.width,vars.canvas.height);	var x,y,z,size;	vars.ctx.fillStyle="#def";	for(var i=0;i<vars.flakes.length;++i){	x=vars.flakes[i].x;	y=vars.flakes[i].y;	z=vars.flakes[i].z;	pt=project3D(x,y,z,vars);	if(pt.d !=-1){	size=Math.min(1+200000/(1+pt.d*pt.d),300);	if(pt.x>-size/2 && pt.x<vars.canvas.width+size/2 && pt.y>-size/2 && pt.y<vars.canvas.height+size/2){	d=Math.sqrt(x*x+y*y+z*z);	if(size>20){	vars.ctx.globalAlpha = Math.max(0,.75 - Math.pow(d / 100, 4) * .75);	vars.ctx.drawImage(vars.snowflake,pt.x-size/2,pt.y-size/2,size,size);	}else{	vars.ctx.globalAlpha = Math.max(0,.4 - Math.pow(d / 100, 4) * .4);	vars.ctx.fillRect(pt.x-size/2,pt.y-size/2,size,size);	}	}	}	}
}
function loadScene(vars){	vars.snowflake=new Image();	vars.snowflake.src="http://cantelope.org/snow/snowflake.png";	var initParticles=4000,x,y,z;	vars.flakes=[];	for(var i=0;i<initParticles;++i){	x=-100+Math.random()*200;	y=-100+Math.random()*200;	z=-100+Math.random()*200;	vars.flakes.push(new Vert(x,y,z));	}
}
function frame(vars) {	if(vars === undefined){	var vars={};	vars.loaded=0;	vars.scene=new Image();	vars.scene.src="http://cantelope.org/snow/scene.jpg";	vars.scene.addEventListener("load",function(){	vars.loaded=1;	});	vars.canvas = document.createElement("canvas");	document.body.appendChild(vars.canvas);	vars.ctx = vars.canvas.getContext("2d");	vars.canvas.width = window.innerWidth;	vars.canvas.height = window.innerHeight;	window.addEventListener("resize", function(){	vars.canvas.width = window.innerWidth;	vars.canvas.height = window.innerHeight;	vars.cx=vars.canvas.width/2;	vars.cy=vars.canvas.height/2;	}, true);	vars.canvas.addEventListener("mousemove", function(e){	var rect = vars.canvas.getBoundingClientRect();	vars.mx = Math.round((e.clientX-rect.left)/(rect.right-rect.left)*vars.canvas.width);	vars.my = Math.round((e.clientY-rect.top)/(rect.bottom-rect.top)*vars.canvas.height);	}, true);	vars.canvas.addEventListener("mousedown", function(e){	vars.mbutton=1;	}, true);	vars.canvas.addEventListener("mouseup", function(e){	vars.mbutton=0;	}, true);	vars.canvas.addEventListener("touchstart", function(e){	vars.mbutton=1;	e.preventDefault();	var rect = vars.canvas.getBoundingClientRect();	vars.mx = Math.round((e.changedTouches[0].pageX-rect.left)/(rect.right-rect.left)*vars.canvas.width);	vars.my = Math.round((e.changedTouches[0].pageY-rect.top)/(rect.bottom-rect.top)*vars.canvas.height);	}, true);	vars.canvas.addEventListener("touchend", function(e){	vars.mbutton=0;	}, true);	vars.canvas.addEventListener("touchmove", function(e){	e.preventDefault();	var rect = vars.canvas.getBoundingClientRect();	vars.mx = Math.round((e.changedTouches[0].pageX-rect.left)/(rect.right-rect.left)*vars.canvas.width);	vars.my = Math.round((e.changedTouches[0].pageY-rect.top)/(rect.bottom-rect.top)*vars.canvas.height);	}, true);	vars.camX = 0;	vars.camY = 0;	vars.camZ = -100;	vars.pitch = 0;	vars.yaw = 0;	vars.cx=vars.canvas.width/2;	vars.cy=vars.canvas.height/2;	vars.mx=vars.cx;	vars.my=vars.cy;	vars.scale=800;	vars.frameNo=0;	loadScene(vars);	}	vars.frameNo++;	requestAnimationFrame(function() { frame(vars);	});	if(vars.loaded){	process(vars);	draw(vars);	}
}
frame();
Snow - Script Codes
Snow - Script Codes
Home Page Home
Developer Scott R McGann
Username cantelope
Uploaded November 11, 2022
Rating 3.5
Size 3,204 Kb
Views 12,144
Do you need developer help for Snow?

Find the perfect freelance services for your business! Fiverr's mission is to change how the world works together. Fiverr connects businesses with freelancers offering digital services in 500+ categories. Find Developer!

Scott R McGann (cantelope) Script Codes
Name
Recursive Trees
WebGL Colors
Modulation
Pulse
3D Pong
Circle
Js1k6
Road
Background
Formations
Create amazing web content with AI!

Jasper is the AI Content Generator that helps you and your team break through creative blocks to create amazing, original content 10X faster. Discover all the ways the Jasper AI Content Platform can help streamline your creative workflows. Start For Free!