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You will probably not need to explicitly specify or change the camera direction vector but it is described here in case you do. It tells POV-Ray the initial direction to point the camera before moving it with the look_at or rotate vectors (the default value is direction<0,0,1>). It may also be used to control the (horizontal) field of view with some types of projection. The length of the vector determines the distance of the viewing plane from the camera's location. A shorter direction vector gives a wider view while a longer vector zooms in for close-ups. In early versions of POV-Ray, this was the only way to adjust field of view. However zooming should now be done using the easier to use angle keyword.
If you are using the ultra_wide_angle, panoramic, or cylindrical projection you should use a unit length direction vector to avoid strange results.
The length of the direction vector doesn't matter when using the orthographic, fisheye, or omnimax projection types.
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