New answers tagged sets
5
I guess you're trying to plot the set of points $(x,y,z)$ such that $3x^2>2y^2+z^2$ and $x^2+y^2=1$. Now RegionPlot3D only works for inequalities, while ContourPlot3D only works for equations. But you can use ContourPlot3D on the equation and supply it the inequality as a RegionFunction.
ContourPlot3D[x^2 + y^2 == 1, {x, -1, 1}, {y, -1, 1}, {z, -2, 2},
...
1
Perhaps ContourPlot3D is useful, with an expression for x, y, and z, plus added constraints?
ContourPlot3D[Sin[x] Cos[y] Tan[z],
{x, -Pi, Pi},
{y, -Pi, Pi},
{z, -Pi, Pi},
RegionFunction -> Function[{x, y, z}, (x^2 > (2 y^2 + z^2 ))],
AxesStyle -> White
Background -> Black]
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