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I have come across something that I have never seen mentioned. When
using focal blur in the past, I have always made the focal_point and the
look_at the same. In a recent image, however, for artistic effect, I
made a change. I had an object off to the side of the look_at point and
made it the focal_point, leaving a good distance between the two. When I
applied focal blur, the area in focus was a meandering horizontal swath
across the image, rather than the more circular region you would expect.
There are probably some interesting possibilities there...
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Dave Dunn <poi### [at] aol com> wrote:
> the area in focus was a meandering horizontal swath
> across the image, rather than the more circular region you would expect.
Could you explain this in more detail? I didn't quite understand it.
The amount of focal blur depends solely on the distance from the camera
location. It does not depend in any way in the location of the look_at point.
--
#macro N(D)#if(D>99)cylinder{M()#local D=div(D,104);M().5,2pigment{rgb M()}}
N(D)#end#end#macro M()<mod(D,13)-6mod(div(D,13)8)-3,10>#end blob{
N(11117333955)N(4254934330)N(3900569407)N(7382340)N(3358)N(970)}// - Warp -
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Warp wrote:
>
> The amount of focal blur depends solely on the distance from the camera
> location. It does not depend in any way in the location of the look_at point.
That's what I thought, too, but I had no other explanation for what happened. I
don't have access to the image on this machine. I will try and post to p.b.i
later today.
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In article <3d64e006@news.povray.org> , Warp <war### [at] tagpovrayorg> wrote:
> The amount of focal blur depends solely on the distance from the camera
> location. It does not depend in any way in the location of the look_at point.
No, but on the focal_point which does not have be the look_at point. The
distance is calculated from the camera location and focal_point. Nothing
else matters for that calculation.
Thorsten
____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde
Visit POV-Ray on the web: http://mac.povray.org
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