POV-Ray : Newsgroups : povray.binaries.images : The Orthographic Decapitation : Re: The Orthographic Decapitation Server Time
30 Jul 2024 04:13:03 EDT (-0400)
  Re: The Orthographic Decapitation  
From: clipka
Date: 12 Dec 2012 13:34:29
Message: <50c8ce35$1@news.povray.org>
Am 12.12.2012 18:40, schrieb gregjohn:

>> Did you actually move the camera away? Or did you just mess with its angle,
>> right/up vectors or scaling? Moving the camera away should be doing the trick,
>> unless your objects are still inhabiting the camera's location. You might want
>> to try something like this: location <0, .5, -1>*1000
>>
>> Sam
>
> No, I actually doubled it (but at the same time moved new figures closer to the
> bottom.

That was the mistake: At the same time as doubling the distance to the 
coordinate origin, you also doubled the viewport and scene dimensions. 
So while the camera now doesn't cut off the heads of the old population, 
you have moved new figures into the region where heads are being cut pff 
/now/.

/Only/ increase the camera's distance, leave the viewport size 
unchanged, and don't add new people.


The whole reason for this effect is that the camera must shoot its rays 
from /somewhere/ - infinity won't work, as it's not a good value to do 
math on ;-). So the rays are shot from the plane going through the 
camera position and being perpendicular to the camera direction. If one 
of your figures sticks its head through this plane, the camera rays will 
hit (and thus see) only his inside, effectively decapitating him.


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