> 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.

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