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On Wed, 21 Nov 2001 10:48:21 -0500, "Anders K." <and### [at] f2s com>
wrote:
>> > Camera is off by half a pixel
>>
>> Not to start a flame war or anything but does it really matter ?
>
>Yes. At least me and John VanSickle have been annoyed by it. It's a problem,
>for example, when you try to make a box that fits exactly within the
>camera's view. Go to Insert > Scene templates > Orthographic scene, which
>attempts to do exactly that. Add background { red 1 } or something to make
>the background visible, and render the scene with antialiasing on. You'll
>see a thin red line down the left and bottom of the image. (If you don't add
>the red background there will be a thin black line instead, which is less
>noticable in the render window but still a problem.)
>
>Anders
>
>
>
Just tried this (beta 7, Windows ME (yes, I finally
replaced my Amiga)) and can verify that the effect exists. I
created the scene as described above and rendered it at 320x240,
512x384, 640x480, 800x600, 1024x1024. I even rendered it to
a square, at 512x512. In all cases, there was no red with
AA off but with AA method 1 and AA method 2, there was red on
the left edge and on the bottom edge.
I then tried povray 3.1 (I was running v3.1 and v3.5 at
the same time, rendering the same file, how cool is that?) and
the effect did not happen! No red!
What is odd is that I sort of remember the problem
existing wayyyyy back in the day, in DKB render!
Very odd.
Could it be a floating point error as a result of
switching to a different c compiler?
Pete
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