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The simplest kind of insertion is the "what you see is what you get" approach, where the output is what you see in the 3-D views of your 3-D application. The new CG imagery simply superimposed on top of the original shot.
Tip : Make sure that your rendering application is not applying lighting to the projection screen holding the imagery.
While this looks like the thing to do, because it's generally already set up and showing you the result, it is there to aid you in developing the shot and verifying lineup, rather than to use as the final shot. Using an overlay directly is suited for simple examples and previews.
Generally it is easiest to sell the new elements as part of the shot if you can adjust them in a compositing application, such as After Effects, Fusion, Motion, or Nuke, rather than trying to force the material settings on your 3-D render to exactly match the final shot.
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