a = ParametricPlot3D[ {-y-z^2,y,z},{z,-10,10},{y,-20,20}];



b = ParametricPlot3D[ {-y-z^2,y,z},{z,-10,10},{y,-20,20},SphericalRegion->True];


c = ParametricPlot3D[ {-y-z^2,y,z},{z,-10,10},{y,-20,20},SphericalRegion->False];

d = ParametricPlot3D[ {-y-z^2,y,z},{z,-10,10},{y,-20,20},PlotRange->{{x,0,10},{y,0,10},{z,0,10}}];