Fa3ien <fab### [at] yourshoesskynetbe> wrote:

> > Fa3ien <fab### [at] yourshoesskynetbe> wrote:

> >
> >>>   When POV-Ray renders the image it has tons of additional information
> >>> about it besides simply the pixels. It has depth information, normal
> >>> information, all kinds of other things. In order to post-process the
> >>> image using this information you need to either save it all in files
> >>> and then write a program which reads them and does the post-processing,
> >>> or you can write a simple script in the future SDL to do the same thing.
> >
> >> How, in this model, do you adjust a parameter like focal point (in
> >> the case of a blur process) and get a new image within seconds ?
> >
> >   I'm not really sure what you are asking.
>
> Let's say I have a scene that takes 3 hours to render. It shows an
> orange, an apple and a banana, on a table.
>
> I use post-processing to apply heavy focal blur (no oversampling
> with the camera, it would take too long). Initially, the focal
> point is the orange.  But then, I want it to be the banana.
>
> How, in the system you envision, will I be able to change the
> focal point and get a new image within a few seconds, instead
> of taking 3 hours to re-render everything ?
>
> Fabien.

Is it still ray-tracing? You only get an image that is based on a ray-traced
one. But if you end up with what you want, then OK.

My opinion is that ray-tracing is a technique that allows to apply physical
laws in order to match reality. I prefer 'match' than 'fake': POV's focal
blur matches a physical phenomenon, post-processing 'only' fakes. But in
many cases one may get satisfied. That's an essential point.

Bruno

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