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Graphics Interchange Format  |  1997-01-13  |  32.4 KB  |  271x383  |  4-bit (16 colors)
  nsfw: racy: Likely
   ocr: Polygon 0 Polygon 1 No N, - - Vol V1 Viewpoint in Viewspace Figure 5: Backface culling with tbe dot product. Vo'No<O, - - sO polygon 0 facesforward and is visible; VrN,>0, so polygon 1jaces backward and is invisible.