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Suppose I have two nonlinear equalities $x^3 = y^2, y = z^3$. How can I visualize the manifold in $\mathbb{R}^3$ that is generated by simultaneously satisfying the two equalities? I think ContourPlot3D is the one to use but I couldn't get it to work show the set of points in $\mathbb{R}^3$ that satisfy the two equalities. The best I can do is make it show the intersection of the surfaces:

enter image description here

How can I plot the curve defined by the intersection in 3D?

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2 Answers 2

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You can use the option BoundaryStyle to mark the intersection of the two contour surfaces as follows:

ContourPlot3D[{x^3 == y^2, y == z^3}, {x, -2, 2}, {y, -2, 2}, {z, -2, 2}, 
 Mesh -> None, ContourStyle -> Opacity[.3], 
 BoundaryStyle -> {1 -> None, 2 -> None, {1, 2} -> Directive[Thick, Red]}]

enter image description here

Also

SliceContourPlot3D[y - z^3,  x^3 == y^2, {x, -2, 2}, {y, -2, 2}, {z, -2, 2}, 
 Contours -> {{0}}, BoundaryStyle -> None, ContourShading -> None, 
 ContourStyle -> Directive[Red, Thick]]

enter image description here

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  • $\begingroup$ That's exactly what I needed. I follow most of it: Since a list was passed as first argument the '{1 -> None, 2-> None ... }' but how Mathematica knew to handle {1,2} -> is just magic! $\endgroup$
    – ITA
    Commented Feb 26, 2019 at 23:44
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r = 1;
R = ImplicitRegion[{x^3 == y^2, y == z^3}, {{x, -r, r}, {y, -r, r}, {z, -r, r}}];
Region[R]
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