pyromania napsal(a):
> How can i use the camera which is horizontally orthographic and vertically
> perspective projection?
> I couldn't find such option in basic POV-ray.
> So, I download the Megapov which has user_defined option.
> But I cannot understand it.
> I want to know if the user_defined camera can make the scene what i want, and if
> yes, how can i do that with the option.
> I'l so appreciate your advices.
> 
> 
hello,
the cylindric camera might look a bit like what you're looking for.
If this is not good enough (which probably isn't).

To define a camera type, you need to define two vectors for each pixel:
where to shoot the ray from (location) and which direction to shoot at 
(direction).
You can define vector as a function of u and v. U runs from left to 
right in the interval [0..1], V runs from bottom to top.
There are two ways to define these functions. In the first one you 
define each vector component (x,y,z) independently.

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