Картинка:Sphere with chart.png
от Уикипедия, свободната енциклопедия

Sphere_with_chart.png  (38 КБ, MIME type: image/png)
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A sphere with the chart mapping the upper hemisphere to a disk.
Created by me using Matlab.
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[edit] Matlab source
clf;
hold on;
colormap([0 0 1; 1 0.2 0.2; 1 0 0; 0 0 0]);
[sx,sy,sz] = sphere(49);
sc = [ ones(24,50); 2*ones(26,50) ];
surf(sx,sy,sz, sc, 'EdgeColor', 'none', 'FaceColor', 'flat', ...
     'FaceLighting', 'phong');
sz2 = 2*ones(50,50);
sc2 = 3*ones(50,50);
surf(sx,sy,sz2, sc2, 'EdgeColor', 'none', 'FaceColor', 'flat', ...
     'FaceLighting', 'phong', 'FaceAlpha', 0.5);
[cx,cy,cz] = cylinder([0.005 0.005]);
cc = 4*ones(size(cx));
surf(cx+1, cy,   2*cz, cc);
surf(cx-1, cy,   2*cz, cc);
surf(cx,   cy+1, 2*cz, cc);
surf(cx,   cy-1, 2*cz, cc);
surf(cx,   cy,   cz+1, cc);
view(3);
camlight left;
axis equal;
axis off;
print -dpng spc_tmp.png
system('convert -trim spc_tmp.png spc.png');
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