Elipsoid

a=2;b=3;c=4;
ContourPlot3D[x^2/a^2+y^2/b^2+z^2/c^2==1,{x,-a,a},{y,-b,b},{z,-c,c},BoxRatios->Automatic]

Elipticki valjak

ContourPlot3D[x^2/a^2+y^2/b^2+0 z^2/c^2==1,{x,-a,a},{y,-b,b},{z,-c,c}]

Hiperbolicki valjak

ContourPlot3D[x^2/a^2-y^2/b^2+0 z^2/c^2==1,{x,-4a,4a},{y,-4b,4b},{z,-2c,2c}]

Parabolicki valjak

p=1;ContourPlot3D[y^2==2p x+0 z,{x,-4a,4a},{y,-4b,4b},{z,-2c,2c}]

Jednokrilni hiperboloid

a=2;b=3;c=4;
ContourPlot3D[x^2/a^2+y^2/b^2-z^2/c^2==1,{x,-2a,2a},{y,-2b,2b},{z,-2c,2c}]

Dvokrilni hiperboloid

a=2;b=3;c=2;
ContourPlot3D[-x^2/a^2-y^2/b^2+z^2/c^2==1,{x,-4a,4a},{y,-3b,3b},{z,-3c,3c}]

Elipticki stozac (konus)

a=2;b=3;c=2;
ContourPlot3D[x^2/a^2+y^2/b^2-z^2/c^2==0,{x,-4a,4a},{y,-3b,3b},{z,-3c,3c}]

Elipticki paraboloid

a=2;b=3;c=2;
ContourPlot3D[x^2/a^2+y^2/b^2==2 c z,{x,-4a,4a},{y,-4b,4b},{z,-c,c}]

Hiperbolicki paraboloid

a=2;b=3;c=2;
ContourPlot3D[x^2/a^2-y^2/b^2==2 c z,{x,-4a,4a},{y,-3b,3b},{z,-c,c}];
ContourPlot3D[x^2-y^2== z,{x,-1,1},{y,-1,1},{z,-1,1}]

ContourPlot3D[x^3+y^2-z^2,{x,-2,2},{y,-2,2},{z,-2,2},Contours->5,Mesh->None,ContourStyle->Opacity[0.5]]

a=2;b=2;c=2;ContourPlot3D[x^2+y^2+z^2,{x,-a,a},{y,-b,b},{z,-c,c},Mesh->None,ContourStyle->{Red,Green,Blue}]