Hi folks.  The floor of the gap between these two boxes is in total
darkness, so I'm using radiosity to bring it out.  The default
radiosity settings produce the inset image, with obvious horizontal
artifacts.

After a few renders I ended up with

 count 80 nearest_count 8 error_bound 0.1
 pretrace_end 0.02 adc_bailout 0.01

....which rendered the attached image in 6h45m.  It still isn't good:
it looks like my graphic equaliser is leaking coal dust.  And it takes
five times as long to render as radiosity{}.

I've had about enough of the tweak/render loop, so I'm turning to you
for advice.

Also, the finer settings introduced the black splotch arrowed.  Ummm, ?

Actually, I'm not too cut up about the final result - these models are
part of a much larger project and will not be viewed too closely, and
certainly not on a green and yellow chequered plane.  That's why I'm
not fixing the image maps or the cable texture.  However I would like
to understand radiosity a little better, so I'm looking forward to
your suggestions.


Many thanks in advance.

Post a reply to this message

Attachments:
Download 'guitars.cs2knobs.inset.jpg' (116 KB)

Preview of image 'guitars.cs2knobs.inset.jpg'

Well, ever since I traded in my stomp boxes on a rack mount unit with a
multifunction pedal I haven't had any problem with the radiosity at all...

<ducks and runs away quickly>

RG

Post a reply to this message

Ever since I traded my rack mount for directx/vst plugins...
:)

Post a reply to this message

what about increasing the count?

Post a reply to this message

"Eli" <eli### [at] jehoelnet> wrote:
> what about increasing the count?

At your suggestion I tried 200 overnight (11 hours), and the image is about
the same.  The splotchiness has tighter edges :-)  Not to worry, it's not a
final.

Thanks for the suggestion.

Post a reply to this message

Ard nous apporta ses lumieres en ce 2005-12-06 17:59:
> Hi folks.  The floor of the gap between these two boxes is in total
> darkness, so I'm using radiosity to bring it out.  The default
> radiosity settings produce the inset image, with obvious horizontal
> artifacts.
> 
> After a few renders I ended up with
> 
>  count 80 nearest_count 8 error_bound 0.1
>  pretrace_end 0.02 adc_bailout 0.01
> 
> ....which rendered the attached image in 6h45m.  It still isn't good:
> it looks like my graphic equaliser is leaking coal dust.  And it takes
> five times as long to render as radiosity{}.
> 
> I've had about enough of the tweak/render loop, so I'm turning to you
> for advice.
> 
> Also, the finer settings introduced the black splotch arrowed.  Ummm, ?
> 
> Actually, I'm not too cut up about the final result - these models are
> part of a much larger project and will not be viewed too closely, and
> certainly not on a green and yellow chequered plane.  That's why I'm
> not fixing the image maps or the cable texture.  However I would like
> to understand radiosity a little better, so I'm looking forward to
> your suggestions.
> 
> 
> Many thanks in advance.
> 
> 
> 
> ------------------------------------------------------------------------
> 
Increasing error_bound usualy lead to smoother results. You can try something around
0.4 to 0.8. Low 
values also take more time and memory that larger ones.
When using low error_bound value, you frequently need to proportionaly increase the
count, you may 
need a value higher than 800.
Lowering low_error_factor result in more samples at the end of the pretrace, it can
improve your 
results.
Lowering pretrace_end can, in some instances, provide higher quality.

-- 
Alain
-------------------------------------------------
Islam #3: If shit happens, blame Israel.

Post a reply to this message

"Ard" <ard### [at] waikatoacnz> wrote...
> Hi folks.  The floor of the gap between these two boxes is in total
> darkness, so I'm using radiosity to bring it out.  The default
> radiosity settings produce the inset image, with obvious horizontal
> artifacts.
>
> After a few renders I ended up with
>
>  count 80 nearest_count 8 error_bound 0.1
>  pretrace_end 0.02 adc_bailout 0.01

Usually black spots with radiosity around reflective objects means that you
need to decrease the adc_bailout and/or increase the max_trace_level.

-Nathan

Post a reply to this message

"Ard" <ard### [at] waikatoacnz> wrote:
> Also, the finer settings introduced the black splotch arrowed.  Ummm, ?

Did you try increasing max_trace_level?  In images including reflective
objects, I often have to double the max_trace_level when I use radiosity.

Post a reply to this message

Ard wrote:
> Hi folks.  The floor of the gap between these two boxes is in total
> darkness, so I'm using radiosity to bring it out.  The default
> radiosity settings produce the inset image, with obvious horizontal
> artifacts.
> 
> After a few renders I ended up with
> 
>  count 80 nearest_count 8 error_bound 0.1
>  pretrace_end 0.02 adc_bailout 0.01
> 
> ....which rendered the attached image in 6h45m.  It still isn't good:
> it looks like my graphic equaliser is leaking coal dust.  And it takes
> five times as long to render as radiosity{}.
> 
> I've had about enough of the tweak/render loop, so I'm turning to you
> for advice.
> 
> Also, the finer settings introduced the black splotch arrowed.  Ummm, ?
> 
> Actually, I'm not too cut up about the final result - these models are
> part of a much larger project and will not be viewed too closely, and
> certainly not on a green and yellow chequered plane.  That's why I'm
> not fixing the image maps or the cable texture.  However I would like
> to understand radiosity a little better, so I'm looking forward to
> your suggestions.
> 
> 
> Many thanks in advance.
> 
> 
> 
> ------------------------------------------------------------------------
> 

1) This is a beautiful image and I would love to see a zoomed-out
version.

2) Touch up the image in photoshop or gimp or some other paint
program to fix any sploches.

Post a reply to this message