POV-Ray : Newsgroups : povray.advanced-users : Orthographic Oddity : Re: Orthographic Oddity Server Time
2 Nov 2024 13:18:56 EDT (-0400)
  Re: Orthographic Oddity  
From: Chris Colefax
Date: 7 Aug 1999 20:46:51
Message: <37acd37b@news.povray.org>
Ken wrote:
>
> In the following bit of code the scene renders as expected when the
ortographic
> camera type is commented out. When it is used however the pattern on the z
axis
> plane continues uninterrupted on the y axis plane as if the pattern were
applied
> to both. Why ?

The orthographic camera traces rays parallel to the viewing direction, in
this case +z.  Your floor plane also lies in this direction (and its surface
is infinitely thin), so none of the camera rays will actually intersect it.
What you are seeing is the shadow of the floor plane, cast on to your wall -
the high ambient value of your wall pattern makes it look like a reflection
of sorts.


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