- 711 名前：デフォルトの名無しさん [02/09/01 04:00]
- とりあえず、Javaが盛んそうなので、前スレのレイトレ１３行を縮めてみた
pc3.2ch.net/test/read.cgi/tech/984182993/209
import java.awt.*;class R{public static void main(String[]a){new Frame(){double
a,b,c,d,R;int x,y,w,z=255;{resize(z,z);show();}public void paint(Graphics g){
for(;y<z;y++)for(x=0;x<z;g.drawRect(x++,y+20,0,0))g.setColor(new Color(w=L(new
V(x-128,y-128,100),new V(0,0,200)),w,w));}int L(V A,V B){a=A.c(A);b=A.c(B);c=B.
c(B)-10000;R=(Math.sqrt(d=b*b-a*c)-b)/a;if(d>0){V N=new V(A.x*R,A.y*R,A.z*R);N.
n();R=(N.x+N.y-N.z)/Math.sqrt(3);A.x-=B.x;A.y-=B.y;A.z-=B.z;a=-N.c(A);N.x=2*N.x
*a+A.x;N.y=2*N.y*a+A.y;N.z=2*N.z*a+A.z;w=(int)(F(N)*R);return R>0?(w>0?w:(int)(
R*z)):30;}return F(A);}int F(V A){a=A.x;b=10000-A.r;c=A.y==0?0:b/A.y;return c>0
?((((a*c>0?a*c+b/2:-a*c)%b)>b/2)^(((A.z*c+200)%b)>b/2)?100:200):0;}};}}class V{
double x,y,z,r;V(double a,double b,double c){x=a;y=b;z=c;}V(V a){x=a.x;y=a.y;z=
a.z;}double c(V s){return x*s.x+y*s.y+z*s.z;}void n(){r=Math.sqrt(x*x+y*y+z*z);
x/=r;y/=r;z/=r;}}
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