in news:3d6521b6$1@news.povray.org Patrick Dugan wrote:

> The
> documentation (6.4.3) indicates the blur should radiate from a focal
> point. 

"The center of the zone of sharpness is specified by the focal_point 
vector. Objects close to this point are in focus and those farther from 
that point are more blurred. The default value is focal_point<0,0,0>."

Is this the part that makes you think that the area of focus is 
circular? If so it probably needs to be re-phrased.

>It says nothing about a "plane" of focus or it being linear. I
> think it is a bug in Povray's focal blur.
> 

The secene below tries to illustrate that it is a plane of focus, just 
like in the real world. 


---%<------%<---
#version 3.5;
global_settings {assumed_gamma 1.0}

camera {
  location  <3.0, 0.0, -3.0>
  look_at   <0.0, 0.0,  0.0>
  right     x*image_width/image_height
  aperture 20.0        
  blur_samples 50      
  focal_point <0,0,0>  
  confidence 0.99
  variance 0.001   
}

light_source {<500,500,-500>, rgb 1}

plane {y, -1 pigment { checker}}

sphere {
  0.0, 0.5
  pigment {rgb 1}
}
---%<------%<---

Ingo

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