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On 11/9/2016 12:28 AM, omniverse wrote:
> Mike Horvath <mik### [at] gmail com> wrote:
>> http://wiki.povray.org/content/Reference:Camera#Focal_Blur
>>
>> How can a plane be parallel to the camera? Can't a plane only be
>> perpendicular to a vector?
>>
>> Also, I don't understand why a plane is used at all. All points
>> equidistant from focal_point should form a sphere, don't they?
>
> Probably parallel in the view sense, every plane forward of the camera view
> would be considered parallel.
> Someone else would need to answer that second part, but I think the way it works
> is to simply use a flat plane like orthographic projection does. Maybe... maybe
> not.
>
> I looked at your SDL and the new screen.inc (I renamed mine here screen2.inc to
> not mix it up with the old one).
>
> Found that by using aperture 0.01 to focus the blurring while testing, and using
> the camera location instead of <0,0,0> I could get a look at the text again by
> adding a little z to it.
> Of course, it blurs away immediately after clock increases away from 0.
>
> focal_point CameraLocation+z*0.4
>
> If 0.3 or 0.5 is used the text blurs out, so obviously there's a very narrow
> focus area.
> I don't know if you will be able to discover a method to keep the text at the
> focal plane but seems like it shouldn't be impossible either.
>
> Bob
>
>
Eventually I got the text to show up, but as you said it doesn't stay in
focus as the clock increases. I gave up and added the text using
ImageMagick instead.
Mike
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