oh right, now I remember. for bottom text, consider font height.

#macro label(Text,objv,r,col,top)
#local vl = vlength(objv-campos)/88;
#if (top)
#local pnt = camup*(r*1.05)+objv;
#else
#local pnt = -camup*(vl*FontSize+r)+objv;
#end
#local eye = vnormalize(pnt-campos);
object {
  text {
    ttf "Arial.ttf" Text 2 0
    texture {  pigment { rgb col }  finish { ambient 1 diffuse 0 } }
  }
  translate x*(strlen(Text)*-0.25)
  scale <vl*FontSize,vl*FontSize,vl*FontSize>

popmatrix(vnormalize(vcross(camup,eye)),vnormalize(vcross(eye,vcross(camup,eye))),eye,pnt)
  no_shadow
}
#end

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