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on 4 Oct 2021
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r=5:.02:420;
t=log(r)*5;
M=zeros(1500);
for k=0:2:4
M(sub2ind(size(M),750+fix(r.*sin(t+k)),750-fix(r.*cos(t+k))))=r.^.5;
end
w=sin(0:.06:pi);
mesh(rot90(conv2(M,w'*w)))
view(60,84)
light('Po',[100 -40 2],'St','local','Col',[0 1 1]);
light('Po',[0 -1 1]);
set(gca,'CameraViewA',3)
colormap copper
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