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『数覚とは何か』 (* === Following code of Mathematica 8 generates this image. === *) a = 3; (* center hole size *) b1 = 7; b2 = 2; b3 = 5; c = 3; (* distance from the center of rotation *) d = 4; (* the number of tori *) h = 4; (* height of a torus *) SetOptions[ParametricPlot3D, PlotRange -> Full, Mesh -> None, Boxed -> False, Axes -> False, PlotPoints -> 500, ImageSize -> 3000, Background -> RGBColor[{200, 200, 240}/255], PlotStyle -> Directive[Specularity[White, 90], Texture[Import["D:/tmp/94.jpg"]]], TextureCoordinateFunction -> ({#4/b2, #5 Pi b1} &), Lighting -> "Neutral"]; x = (a - Sin[t] - Sin[b1 s]) Sin[b3 s] + c; y = (a - Cos[t] - Cos[b1 s]) Sin[b3 s] + c; z = (a - h Sin[b2 s]) + c; rm = Table[{x, y, z}.RotationMatrix[2 i Pi/d, {0, 0, 1}], {i, d}]; ParametricPlot3D[rm, {t, 0, 2 Pi}, {s, 0, 2 Pi}] (*--- The Texture Another shapes and colors *)

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