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From: Mike Raiford
Subject: Focal Blur: Accuracy in reflection and refraction
Date: 12 Nov 2004 10:15:57
Message: <4194d3ad@news.povray.org>
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I'm rendering a scene right now that involves a sphere, reflection, and
focal blur. (Desktop image -- may post in PBI if wanted, its similar to
a previous RSOCP image...)
It appears (unexpectedly) that the reflected scene in the sphere has a
greater DOF than does the actual scene behind the sphere. Is this
similar to some physical phenomenon? (I don't have a reflective sphere
to see for myself) or is it just an artefact of the focal blur algorithm?
I'm curious to see if placing a lens in front of a camera that has focal
blur turned on changes the focus of the scene behind the lens, but I
haven't gotten to that experiment, yet.
--
~Mike
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mra### [at] hotmail com news:4194d3ad@news.povray.org
> It appears (unexpectedly) that the reflected scene in the sphere has a
> greater DOF than does the actual scene behind the sphere. Is this
> similar to some physical phenomenon? (I don't have a reflective sphere
> to see for myself) or is it just an artefact of the focal blur algorithm?
I think that this is very correnct (and can not be achived using faked-
postprocessed-DOF-blur).
The distance camera-->mirror----->object is probably longer then
camera-->objects directly, there fore object is further away in optical
sense, and should be more blurred.
--
http://www.raf256.com/3d/
Rafal Maj 'Raf256', home page - http://www.raf256.com/me/
Computer Graphics
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On 12 Nov 2004 15:07:08 -0500, "Rafal 'Raf256' Maj" <spa### [at] raf256com>
wrote:
>The distance camera-->mirror----->object is probably longer then
>camera-->objects directly, there fore object is further away in optical
>sense, and should be more blurred.
And remember Mike, that when you look at an object in a mirror your
eye automatically refocuses.
Regards
Stephen
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