I would like to simulate a blur for a particular refractive error, e.g.
regarding a human eye that needs glasses.  For example, I would like to
apply an alogrithm to a bitmap of an eye chart or other photo that
simulates what a person with an uncorrected refractive error of -2.25 +
1.25 @ 30 would see.  Is there a simple tutuorial out there for
implementing this?

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> I would like to simulate a blur for a particular refractive error,
> e.g. regarding a human eye that needs glasses.  For example, I would
> like to apply an alogrithm to a bitmap of an eye chart or other photo
> that simulates what a person with an uncorrected refractive error of
> -2.25 + 1.25 @ 30 would see.  Is there a simple tutuorial out there
> for implementing this?
Not that I know of. If I understand what you're doing, it sounds like
you want a 2D filter such as you might get in Photoshop or the GIMP,
rather than a raytracer. Now if you wanted to create a 3D scene and have
it look out-of-focus, maybe POV-Ray can do what you want. I'm not sure
what's involved in simulating human eyesight problems, but maybe
depth-of-field is the sort of thing you want. Section 3.2.2.3 of the
manual deals with this, so you can find out more there.

What you are asking about is off-topic for this group, which deals with
programming POV-Ray itself (that is, changes to the source code) rather
than using POV-Ray. For this reason I have set followup-to
povray.newusers, where you may find more help.

Daniel

-- 
A most peculiar man    With the windows closed      And Mrs Reardon says
He died last Saturday  So he'd never wake up  He has a brother somewhere
He turned on the gas   To his silent world   Who should be notified soon
And he went to sleep   And his tiny room    .oO( http://sad.istic.org/ )

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