x:=u^2; y:=sqrt(2)*u*v; z:=v^2; plot3d([x,y,z],u=-2..2,v=-2..2,axes='FRAMED', orientation=[170,135],style='PATCH'); The resulting plot appears to the right.
x:=u^2; y:=sqrt(2)*u*v; z:=v^2; plot3d([x,y,z],u=-2..2,v=-2..2,axes='FRAMED', orientation=[170,135],style='PATCH');