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> question:I cannot find the keyword camera{}in the source code,can you tell me
> which codes act as the function of camera? Thanks!
>
>
If you don't define a camera, there is a default camera that will be
used. It's defined as follow:
camera{
perspective
location<0,0,0>
up y
sky y
right 1.33*x
direction z
look_at z
}
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