1) I messed up scaling the water iso, so the waves are too wide to see.
2) I used a crappy HDR probe image.
3) I used the vine macro and the corrosion macro, just to see if they play 
nice. They do.

This image uses radiosity, but I doubt it caused the odd blotches.

Anyone have any ideas about what these are? Once I can figure it out, I'll 
rerender...as it took 13hr..

ian

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Attachments:
Download 'HDRSphere.jpg' (217 KB)

Preview of image 'HDRSphere.jpg'

"[GDS|Entropy]" <gds### [at] hotmailcom> wrote:
> This image uses radiosity, but I doubt it caused the odd blotches.
>
> Anyone have any ideas about what these are? Once I can figure it out, I'll
> rerender...as it took 13hr..

They look like radiosity artifacts to me. Try raising the count. Also, make sure
recursion_limit is high enough that radiosity rays are making it through the
water surface!

Bill

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"Bill Pragnell" <bil### [at] hotmailcom> wrote in message 
news:web.49ba240d644b8e0a6dd25f0b0@news.povray.org...
> "[GDS|Entropy]" <gds### [at] hotmailcom> wrote:
>> This image uses radiosity, but I doubt it caused the odd blotches.
>>
>> Anyone have any ideas about what these are? Once I can figure it out, 
>> I'll
>> rerender...as it took 13hr..
>
> They look like radiosity artifacts to me. Try raising the count. Also, 
> make sure
> recursion_limit is high enough that radiosity rays are making it through 
> the
> water surface!
>
> Bill

Turns out that it was MTL... O_o'

I fixed my isosurface. And I found a bug in my macros.
Apparently, something does not like it when your trace test vector is 
different between calls to the various macros. WTF? I thought that I had 
written them so that it didn't matter. Guess I was wrong.

Once this next render is done I will post its source, as I am not seeing the 
problem.

My next version will probably include the glacier iso and snow macros, so I 
can have spring on the lower left and winter on the upper right, just to get 
some thematic asymmetric balance in there.

ian

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"[GDS|Entropy]" <gds### [at] hotmailcom> wrote:
> 1) I messed up scaling the water iso, so the waves are too wide to see.
> 2) I used a crappy HDR probe image.
> 3) I used the vine macro and the corrosion macro, just to see if they play
> nice. They do.
>
> This image uses radiosity, but I doubt it caused the odd blotches.
>
> Anyone have any ideas about what these are? Once I can figure it out, I'll
> rerender...as it took 13hr..
>
> ian

It looks like they may possibly be bird droppings.

Actually they do look like radiosity artifacts.

-tgq

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"[GDS|Entropy]" <gds### [at] hotmailcom> wrote:

Looks weird (even without the blotches). Like it!

> This image uses radiosity, but I doubt it caused the odd blotches.

I *guarantee* you it did, beyond any doubt.

The blotches also tell me that you're using a version of POV prior to
3.7.0.beta.29-rad1 (or a derivative; given that you mention HDR, I reckon it's
MegaPOV 1.2.1)

Your scene's setting is the role model for the infamous POV 3.6 (and earlier)
"black splotchy artifacts" radiosity bug: An abundance of reflective stuff with
an abundance of interreflection. With this setting, you're almost *inevitably*
to contract the "black pox".

There's just one thing to rule them all, find them, bring them all, and in the
brightness bind them: Crank up max_trace_level a really good deal. All other
resistance is futile.

(Or use the current POV 3.7 beta of course.)

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"Bill Pragnell" <bil### [at] hotmailcom> wrote:
> They look like radiosity artifacts to me. Try raising the count. Also, make sure
> recursion_limit is high enough that radiosity rays are making it through the
> water surface!

recursion_limit is not the screw to tweak here. That parameter is somewhat akin
to the max_trace_level, but rather than limiting the number of *total* bounces
calculated, it just limits the number of *diffuse* bounces. There may be an
arbitrary number of reflection/refraction bounces in between - radiosity
doesn't care (unless the general max_trace_level restriction kicks in).

I never tested it, but thinking about it, my first guess would be that raising
recursion_limit would actually make the splotches worse in number (albeit
possibly weaker).

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Mmm...
Apart of artifacts, with some texture correction you could realize a 
spherical pizza!
;-)
Paolo

 >[GDS|Entropy]  on date 13/03/2009 08:13 wrote:
> 1) I messed up scaling the water iso, so the waves are too wide to see.
> 2) I used a crappy HDR probe image.
> 3) I used the vine macro and the corrosion macro, just to see if they play 
> nice. They do.
> 
> This image uses radiosity, but I doubt it caused the odd blotches.
> 
> Anyone have any ideas about what these are? Once I can figure it out, I'll 
> rerender...as it took 13hr..
> 
> ian 
> 
>

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Paolo Gibellini <p.g### [at] gmailcom> wrote:
> Mmm...
> Apart of artifacts, with some texture correction you could realize a
> spherical pizza!
> ;-)
> Paolo

Ahhh!
*Per fortuna che ero seduto!*
A four-cheese pizza with tomato? :-D
(sorry for off-topic)

--
Carlo

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