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- #include <stdlib.h> // card > aek.ppm
- #include <stdio.h>
- #include <math.h>
- typedef int i;
- typedef float f;
- struct v{f x,y,z;
- v operator+(v r)
- {return v(x+r.x,y+r.y,z+r.z);}
- v operator*(f r)
- {return v(x*r,y*r,z*r);}
- f operator%(v r)
- {return x*r.x+y*r.y+z*r.z;}
- v(){}
- v operator^(v r)
- {return v(y*r.z-z*r.y,z*r.x-x*r.z,x*r.y-y*r.x);}
- v(f a,f b,f c){x=a;y=b;z=c;}
- v operator!()
- {return*this*(1/sqrt(*this%*this));}
- };
- i G[]={247570,280596,280600,249748,18578,18577,231184,16,16};
- f R(){return(f)rand()/RAND_MAX;}
- i T(v o,v d,f&t,v&n){
- t=1e9;
- i m=0;
- f p=-o.z/d.z;
- if(.01<p)
- t=p,n=v(0,0,1),m=1;
- for(i k=19;k--;)
- for(i j=9;j--;)
- if(G[j]&1<<k){
- v p=o+v(-k,0,-j-4);
- f b=p%d,c=p%p-1,q=b*b-c;
- if(q>0) {
- f s=-b-sqrt(q);
- if(s<t&&s>.01)
- t=s,n=!(p+d*t),m=2;
- }
- }
- return m;
- }
- v S(v o,v d){
- f t;
- v n;
- i m=T(o,d,t,n);
- if(!m)
- return v(.7,.6,1)*pow(1-d.z,4);
- v h=o+d*t,l=!(v(9+R(),9+R(),16)+h*-1),r=d+n*(n%d*-2);
- f b=l%n;
- if(b<0||T(h,l,t,n))b=0;
- f p=pow(l%r*(b>0),99);
- if(m&1){
- h=h*.2;return((i)(ceil(h.x)+ceil(h.y))&1?v(3,1,1):v(3,3,3))*(b*.2+.1);
- }
- return v(p,p,p)+S(h,r)*.5;
- }
- i main(){
- printf("P6 512 512 255 ");
- v g=!v(-6,-16,0),a=!(v(0,0,1)^g)*.002,b=!(g^a)*.002,c=(a+b)*-256+g;
- for(i y=512;y--;)
- for(i x=512;x--;){
- v p(13,13,13);
- for(i r=64;r--;){
- v t=a*(R()-.5)*99+b*(R()-.5)*99;
- p=S(v(17,16,8)+t,!(t*-1+(a*(R()+x)+b*(y+R())+c)*16))*3.5+p;
- }
- printf("%c%c%c",(i)p.x,(i)p.y,(i)p.z);
- }
- }
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