light tools模拟时都是中心暗，周围有亮圆环。模拟光源为朗伯点光源。 h
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是根据这篇论文编的matlab代码。 1yY0dOoLG)
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clear; +8ZF"{y
H=20; w@fi{H (R
a=100; Fv`,3aNB
itheta=0; `~q < N
i=1; 13/]DF,S"^
for theta=0:0.0001:pi/2 T^]}Oy@e,J
if abs(integral(@(y)cos(y),itheta(i),theta)-1/a)<=0.00005 #gw]'&{8D
itheta(i+1)=theta; BING{ew
i=i+1; [z9Z5sLO
end 0+b1vhQ
end b5n'=doR/I
R=30; A\5L
7
r=0; ]5:8Z@
for i=1:a @ pU)_d!pJ
r(i+1)=sqrt(R^2/a+r(i)^2); \Y}8S/]
end 8, >P
I(:,1)=sin(itheta); 0#^v{DC
I(:,2)=cos(itheta); ^_ mj
N=[0,1]; "g8M0[7e3
P=[0,5]; sCHJ&>m5-
O=[0,1]; H}
g{Cr"Ex
n=1.5896; ~61v5@
for i=1:a; [j'X;tVX{
P(i+1,1)=( N(i,1)*P(i,1) + N(i,2)*P(i,2) ) / ( N(i,1) + N(i,2)*I(i+1,2)/I(i+1,1) ); jEJT-*I1+
P(i+1,2)= P(i+1,1) * I(i+1,2) / I(i+1,1); xKp4*[}m
O(i+1,1)=( r(i) - P(i+1,1) ) / sqrt( (r(i)-P(i+1,1))^2 + (H-P(i+1,2))^2); nzeX[*
O(i+1,2)=(H-P(i+1,2)) / sqrt( (r(i)-P(i+1,1))^2 + (H-P(i+1,2))^2 ); jRV/A!4
N(i+1,=( O(i+1, - n*I(i+1,) / sqrt( 1 + n^2 - 2*n*dot(O(i+1,,I(i+1,) ); SasJic2M
end }RqK84K
P(:,3)=0; $ iz|\m
plot(P(:,1),P(:,2)); H$ 4:lH&(
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