Hugo wrote:
> 
> Hello!
> 
> I'm really glad whenever I see people want to improve POV, and are able
> to do it!  ;o)  Now, pardon me for being dumb maybe but I still wonder
> why you are not using a simpler method for blurring.
> 
> I can imagine my idea isn't working with transparent surfaces, but.. In
> my opinion it wouldn't produce a wrong result if: POV renders the
> reflection in the "ordinary" old way, but into a separate buffer instead
> of the screen. Then use simple and fast gaussian blur, and them UV map
> it onto the object again, as a pigment.
> 
> I don't know if nearby objects are supposed to blur less, according to
> physics, but if so, then we could use the same method as post-processing
> camera depth blur.
> 

Your idea has strong similarities with megapov's post-processed focal blur and
has the same pros and cons (like being strongly resolution dependant).  As you
said near objects should have less blur than those far away, so you would use
the depth information like with focal blur. Right now post processing neither
supports transparency nor reflection, so things would not work correctly in many
cases.  Furthermore results with semitransparent objects would be very bad
anyway.

Your mapping idea does not seem that good to me, because it would only lead to
interferences and the need for interpolation or high resolution and therefore
slower rendering times.  

> I know there's a tricky thing according to edges of the object, if it's
> blurred my way. But my idea is that the buffer should contain a
> reflection of the object that "follows the objects shape".
> 

The edges are handled quite well with focal blur, so that would not be the
problem.  There are quite a lot of problems with post processed blur like the
enormous memory use when working with large images and the things mentioned
above, so it probably could not replace other methods.  Anyway it could be a
nice addition to the depth post processing (which is used by focal blur IIRC) to
support transparency and reflection, although i don't think it's that easy to
implement.

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
Homepage: http://www.schunter.etc.tu-bs.de/~chris/

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