How can I overlap image on Graphics3D at a specific position?

Question

I make a Polygon with size of {width=0,length=50,height=30}; I want to overlap Image on Polygon at position {width=0,length=25,height=15}. For this purpose I wrote some code:

myImage=

     Show[Rasterize[Show[Graphics3D[Polygon[{{0, 0, 0}, {0, 0, 30}, {0, 50, 30}, {0, 50, 0}}], 
                               Lighting -> {LightBlue}, Boxed -> False
                                   ](*Graphi3D is closed here*)
                        ](*Show is closed*),
                    "Image",Background -> None, ImageSize -> {300,300}
                   ](*RasterSize is closed here*), 
          Graphics[Inset[Image[myImage(*its a variable*), ImageSize -> {50, 50}],Scaled[{25, 15}]]]
        ](*Show is closed here*)

After evaluation of the above code I faced two problems

1. Graphics3D is not rotated,

2. Imageis not overlapped,

I want to overlap Image at a specific position on Polygon and if we have rotated Polygon automatically that overlapping Image was also rotated.

Answer 1

The good Doctor beat me, but anyway:

poly = {{0, 0, 0}, {0, 0, 30}, {0, 50, 30}, {0, 50, 0}};
texture = Import["http://i.stack.imgur.com/6LF9n.jpg"];
Graphics3D[{Lighting -> "Neutral", Texture[texture], 
  Polygon[poly, 
   VertexTextureCoordinates -> {{0, 0, 0}, {1, 0, 0}, {1, 1, 0}, {0, 
      1, 0}}]}, Boxed -> False]

Answer 2

You can use Texture to draw your image on the polygon.

myImage=RandomImage[0.5, {15, 15}];

Graphics3D[{Texture@myImage, 
  Polygon[{{0, 0, 0}, {0, 0, 30}, {0, 50, 30}, {0, 50, 0}}, 
   VertexTextureCoordinates -> {{0, 0}, {1, 0}, {1, 1}, {0, 1}}]}, 
 Lighting -> "Neutral", Boxed->False]

( With thanks to cormullion for the Boxed->False option. )

(* Boxed-> True *)

myImage=ExampleData[{"TestImage", "Lena"}]; (* Boxed-> True *)

myImage = Import["http://i.stack.imgur.com/6LF9n.jpg"]; (* Boxed-> False *)