11.2.12 bdLabel



  \begin{texgraph}[name=texify,export=eps]
  Marges(0,0,0,0),view(-3,3,-3,3),
  view3D(-3,3,-3,3,-3,3), size(7.5),
  B:=M(0,2,0), A:=M(0,0,0), C:=M(0,0,1.5),
  Build3D(
   bdAxes([0,0], [color:=gold,arrows:=1]),
   bdPlan([0,0,1+i,2], [color:=darkseagreen,
                         scale:=0.75]),
   bdSurf(M(u,-v,sqrt(u^4+v^4)-2),
           [color:=steelblue, u:=[-2,2],
            v:=u, smooth:=1,clip:=1,
            clipwin:=[M(-3,-3,-3),M(3,3,2)]]),
   bdLabel([0.25*(1+i),2.25],"z=\sqrt{x^4+y^4}-2",
           [TeXify:=1, scale:=0.75])
  ),
  Display3D()
  \end{texgraph}

 PIC



Option usage of TeXify