html5的canvas实现几何模型3D运动动画效果

JS片段：

<script>
var {atan2,sqrt,sin,cos,PI,acos} = Math;
function project3D(x,y,z,vars){
x-=vars.camX,y-=vars.camY,z-=vars.camZ;
p=atan2(x,z),d=sqrt(z*z+x*x),x=sin(p-vars.yaw)*d,z=cos(p-vars.yaw)*d;
p=atan2(y,z),d=sqrt(y*y+z*z),y=sin(p-vars.pitch)*d,z=cos(p-vars.pitch)*d;
n=-9,b=1,l=9,d=1,e=0,f=0,g=x,h=z,k=(h-f)*(l-n)-(g-e)*(d-b),m=((g-e)*(b-f)-(h-f)*(n-e))/k;
return {x:vars.cx+(n+m*(l-n))*vars.scale,y:vars.cy+y/z*vars.scale,d:sqrt(x*x+y*y+z*z)};
}
function elevation(x,y,z){
return acos(z / sqrt(x*x+y*y+z*z));
}
function subdivide(shape,subdivisions){
var t=shape.segs.length;
for(var i=0;i<t;++i){
var x1=shape.segs[i].a.x;
var y1=shape.segs[i].a.y;
var z1=shape.segs[i].a.z;
var x2=(shape.segs[i].b.x-x1)/subdivisions;
var y2=(shape.segs[i].b.y-y1)/subdivisions;
var z2=(shape.segs[i].b.z-z1)/subdivisions;
shape.segs[i].b.x=x1+x2;
shape.segs[i].b.y=y1+y2;
shape.segs[i].b.z=z1+z2;
var x3=x2;
var y3=y2;
var z3=z2;
for(var k=0;k<subdivisions-1;++k){
shape.segs.push(new Seg(x1+x2,y1+y2,z1+z2,x1+x2+x3,y1+y2+y3,z1+z2+z3));
x2+=x3;
y2+=y3;
z2+=z3;
}
}
}


这是一款很具空间感的基于html5 canvas实现的几何模型3D运动动画效果，好看的3D模型动画特效。