Snow
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 - 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](http://shots.codepen.io/cantelope/pen/gmWejE-512.jpg)
Developer | Scott R McGann |
Username | cantelope |
Uploaded | November 11, 2022 |
Rating | 3.5 |
Size | 3,204 Kb |
Views | 12,144 |
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