ContourPlot3D

ContourPlot3D[f, {x, xmin, xmax}, {y, ymin, ymax}, {z, zmin, zmax}] produces a three-dimensional contour plot of f as a function of x, y, and z.

ContourPlot3D[f == g, {x, xmin, xmax}, {y, ymin, ymax}, {z, zmin, zmax}] plots the contour surface for which f = g.

ContourPlot3D[..., {x, y, z} ∈ reg] takes the variables {x, y, z} to be in the geometric region reg.

Examples

Plot a sphere surface:

ContourPlot3D[x^2 + y^2 + z^2 == 1, {x, -1, 1}, {y, -1, 1}, {z, -1, 1}]

Plot multiple surfaces:

ContourPlot3D[{x^2 + y^2 == 1, z == x}, {x, -2, 2}, {y, -2, 2}, {z, -2, 2}]

Please visit the official Wolfram Language Reference for more details.