I convert quaternion to matrix, and then i use it to rotate some points near
the camera.
ex:
LookAt=(location + DefaultDirection*10)*Matrix

But i don't know how to set the fov (i am a very beginner in povray)?

I write the matrix for the orientation of the object (converted from
quaternion) in the pov file.
But i don't know how to write matrix for the camera (not the math, but how
to declare it in the camera chunk)

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