//--------------------------------------------------------------------------
#declare fn_A = function { sqrt(y*y + z*z) - 0.8 }
#declare fn_B = function { abs(x)+abs(y)-1 }

isosurface { //-------------------------------------------------------------

  function {  min(fn_A(x, y, z), fn_B(x, y, z)) }

  contained_by { box { -3.5, 3.5 } }
  accuracy 0.003
  max_gradient 5

  texture{ pigment{ color rgb<1,0.7,0.5>*0.35}
           finish { phong 1}}
  scale 0.5
  rotate<0,30,0>rotate<-35,0,0>
  translate <0, 1.4, 0.2>
} // end of isosurface -----------------------------------------------------