POV-Ray : Newsgroups : povray.general : QUESTION: Camera Perspective : Re: QUESTION: Camera Perspective Server Time
28 Mar 2024 12:13:35 EDT (-0400)
  Re: QUESTION: Camera Perspective  
From: Subclick
Date: 28 Feb 2020 01:23:08
Message: <s6u36av1b90.fsf@sp.am>
Orthographic is basically the limit of
perspective as the point of view
recedes to infinity while the frame stays still
and its dimensions
remain constant, so you can get a perspective
camera that looks as much
like an orthographic one as you like by toying
with the camera vectors:

camera{
  location FrameCentre
    - FocalLength*vnormalize(LookAt - FrameCentre)
  right FrameWidth*x
  up FrameHeight*y
  direction FocalLength*z
  look_at LookAt
}

Now make FocalLength as large as needed, provided
you don’t make it so
large (think a human-sized frame on the Earth’s
surface with a point of
view on the Sun) rounding errors destroy the scene.

On the other hand, to get “more perspective”
along one axis than along
the other, you need to combine somehow two
different points of view.


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