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I want to plot a torus using the equation of its surface

 With[{R = 106, r = 50}, ContourPlot3D[(Sqrt[x^2 + y^2] - R)^2 + z^2 == r^2, {x, -(R + r), R + r}, {y, -(R + r), R + r}, {z, -r, r}]]

But, but the torus shown is flattened. When I use {z, -(r + R), r + R} it works. Why does it not work with the interval from -r to r?

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You need to change the box ratios:

BoxRatios->{1,1,1/3}

enter image description here

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  • $\begingroup$ BoxRatios -> Automatic works too. (+1) $\endgroup$
    – kglr
    Commented May 23, 2019 at 1:28
  • $\begingroup$ Thank you , why this instruction is necessary, i am new at this? $\endgroup$
    – Max
    Commented May 23, 2019 at 1:46
  • $\begingroup$ Your plotting ranges are from -156 to 156 in $x$ and $y$, but only -50 to 50 in $z$. Mathematica makes a default box of ratios 1,1,1 in scale (stretching each axis to fit). If you want a plot that is thin and flat (for instance), you'll have to change to BoxRatios. Clear? $\endgroup$ Commented May 23, 2019 at 2:02

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