Hi @ all


Well.. first post here. Originally, I wanted to first-post some
kind of "reflective sphere over checkered plane" thing, but now,
as I was inspired by some of the "marbles in a bowl"-images, I
think I will post my version of that...

I know that I have a long way to go to reach the skill of some of
you guys, but I still have some years of my life to try ;)


There are some areas looking like moiree-effects, and some
artifacts which look like wrong pixels on an LCD screen.
Especially for the second ones I have no idea how to fix. The
artifacts can be seen on the second image.


Originally rendered at 1600x1200, this is scaled to 800x600.


Greets
Dave



-- 
Dave "tPassive" Vogt| ruby -e "n=gets.to_i;a=(2..n).to_a;a.each{
Linux  user  #225040| |x|puts x;(x*2).step(n,x){|j|a.delete j}}"
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Attachments:
Download 'marbles-scaled-800x600.jpg' (29 KB) Download 'artifacts.png' (37 KB)

Preview of image 'marbles-scaled-800x600.jpg'

Preview of image 'artifacts.png'

This is a "marble madness" !!! uh ?

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Could be, perhaps, the antialias? Have you tried with method 2?

Fernando

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Looks great! I think the artifacts (if I have actually found them at all)
could be due to max_trace_level. Since the glass continues to reflect upon
itself, it would need a high MTL or it will hit the "roof" and turn black.
The window with the statistics after a rendering will say if the MTL was
reached.

And welcome. Your first post CAN, in fact, be said to fit the tradition.
It's 3 marble spheres on a checked floor - that is so big, you can't see the
other ..checks.. hmm.

Regards,
Hugo

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Hugo Asm wrote:

> Looks great! 

Thanks ;)

> I think the artifacts (if I have actually found
> them at all) could be due to max_trace_level. Since the glass
> continues to reflect upon itself, it would need a high MTL or it
> will hit the "roof" and turn black. The window with the
> statistics after a rendering will say if the MTL was reached.

I don't remember seeing this. MTL was 10, and 3 for the photons.
Now I am rendering the image at 20, resp. 5. Hope that helps...


> 
> And welcome. Your first post CAN, in fact, be said to fit the
> tradition. It's 3 marble spheres on a checked floor - that is so
> big, you can't see the other ..checks.. hmm.

:D



Greets
Dave

-- 
Dave "tPassive" Vogt| ruby -e "n=gets.to_i;a=(2..n).to_a;a.each{
Linux  user  #225040| |x|puts x;(x*2).step(n,x){|j|a.delete j}}"
____________________|_____________________________             |
PGP Key: http://control-alt-del.ch/public_key.asc \____________/

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"Dave Vogt" <dav### [at] control-alt-delch> wrote in message
news:6dc### [at] control-alt-delch...
> Hi @ all

Red, green and blue. Nice.
Would make a good desktop.

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> Now I am rendering the image at 20, resp. 5. Hope that helps...

It may or may not solve the problem, but it will help. Also the adc_bailout
comes in handy. If you adjust these values, you should be able to get rid of
black pixels and avoid slowing down rendering too much.

If the value in MTL is reached, the pixel will turn black, because the real
color of the pixel could not be found within the allowed attempts (in your
case 10 or 20). If the reflections on a surface goes on and on - as certain
spots in your bowl keeps reflecting back and forth - it may be a good idea
to allow the maximum number of attempts (which is 256).

The adc_bailout tries to prevent that rendering slows down a lot. It only
allows reflections to continue when they matter. By default this value is
1/255 but you could try something like 1/64. It may add a tad of noise, but
nothing bad.

Regards,
Hugo

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In article <6dc### [at] control-alt-delch>,
 Dave Vogt <dav### [at] control-alt-delch> wrote:

> Well.. first post here. Originally, I wanted to first-post some
> kind of "reflective sphere over checkered plane" thing, but now,
> as I was inspired by some of the "marbles in a bowl"-images, I
> think I will post my version of that...

This would make a nice desktop image. Interesting without being 
distracting.


> There are some areas looking like moiree-effects, and some

These could be fixed by higher-quality antialiasing settings.


> artifacts which look like wrong pixels on an LCD screen.

Hmm...you're using a lathe object for the cup? Try using "sturm".

ruby -e "n=gets.to_i;a=(2..n).to_a;a.each{|x|puts 
x;(x*2).step(n,x){|j|a.delete j}}"

Primes?

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/

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Christopher James Huff wrote:

> In article <6dc### [at] control-alt-delch>,
>  Dave Vogt <dav### [at] control-alt-delch> wrote:
> 
>> Well.. first post here. Originally, I wanted to first-post some
>> kind of "reflective sphere over checkered plane" thing, but
>> now, as I was inspired by some of the "marbles in a
>> bowl"-images, I think I will post my version of that...
> 
> This would make a nice desktop image. Interesting without being
> distracting.

Thank you!

> 
> 
>> There are some areas looking like moiree-effects, and some
> 
> These could be fixed by higher-quality antialiasing settings.

I'm rendering now with +A0.03 +AM2.. looks better, but they are
still visible :(


> 
>> artifacts which look like wrong pixels on an LCD screen.
> 
> Hmm...you're using a lathe object for the cup? Try using
> "sturm".

Yes, it is... I will try it if the current render does the same
artifacts.


> 
> ruby -e "n=gets.to_i;a=(2..n).to_a;a.each{|x|puts
> x;(x*2).step(n,x){|j|a.delete j}}"
> 
> Primes?
> 

Yep ;)



Greets
Dave


-- 
Dave "tPassive" Vogt| ruby -e "n=gets.to_i;a=(2..n).to_a;a.each{
Linux  user  #225040| |x|puts x;(x*2).step(n,x){|j|a.delete j}}"
____________________|_____________________________             |
PGP Key: http://control-alt-del.ch/public_key.asc \____________/

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