Mathematica: Text in Graphics3D relative to image coordinates
Mathematica documentation states: "Text in three-dimensional graphics is placed at a position that corresponds to the projection of the point {x,y,z} specified. Text is drawn in front of all other objects". How do you position the text relative to the image size?
This is how it can be done in 2D:
custumLabels = Graphics[{
  Text[Style["A", Red, Bold, 18], ImageScaled[{0.025, .95}]], 
  Text[Style["B", Red, Bold, 18], ImageScaled[{0.95, .05}]]}
];
Framed[Show[
  Plot[
    Sin[x] Exp[x], {x, 0, 10},
    Frame -> True,
    PlotRangeClipping -> False,
    FrameLabel -> {"x", "y"}
  ],
  custumLabels
 ],
 FrameMargins -> 0]

 Those labels will always appear in that position as long as PlotRangeClipping is set to False .  The question is, how do you make those labels appear at that particular position if I switch to Graphics3D .  Try it with a simple one.  
Framed[Show[
  Graphics3D[{Sphere[{0, 0, 0}, 1]}]
 ],
 FrameMargins -> 0]
 Epilog and Prolog in 3D use a scaled 2D coordinate system (for all primitives):  
Graphics3D[{Sphere[]}, Epilog -> Text["abcdef", Scaled[{0.1, 0.1}]]]

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