This took 4days 19hours, and still didn't finish (hence its a bit cut off at
the end), but mega pov gradually snagged over 700mb and ground to a halt.

I know the green is to bright, I know its missing the side detail (but that
would have added at least another 2 days to the render)

its not finished, but I am not rendering it again till I have a faster pc :)

oh, 99% directional rad, and 2 very dim area lights to soften it up a touch.


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Rick

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Attachments:
Download 'cdrom.png' (160 KB)

Preview of image 'cdrom.png'

"Rick [Kitty5]" wrote:
> 
> This took 4days 19hours, and still didn't finish (hence its a bit cut off at
> the end), but mega pov gradually snagged over 700mb and ground to a halt.
> 
> I know the green is to bright, I know its missing the side detail (but that
> would have added at least another 2 days to the render)
> 
> its not finished, but I am not rendering it again till I have a faster pc :)
> 
> oh, 99% directional rad, and 2 very dim area lights to soften it up a touch.
> 

I must admit that i don't see a reason for it being that slow.  Radiosity
looks really smooth, but it seems like fairly high error_bound.  Geometry
does not look too complicated either.  

How much time and memory does it take without radiosity?

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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btw - sorry about the file size, but jpg hates green and after waiting days
for this to render I wasnt going to have crappy compression spoil the image


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Rick

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> I must admit that i don't see a reason for it being that slow.  Radiosity
> looks really smooth, but it seems like fairly high error_bound.  Geometry
> does not look too complicated either.

its a very complex csg (the bright green hides the detail unfortunatly) -
takes a 6 hours with 1 point light, no aa (with case side detail its over a
day)

with aa, 2 5x5 area lights, and the rad lighting it crawls...


--
Rick

Kitty5 WebDesign - http://Kitty5.com
Hi-Impact database driven web site design & e-commerce
TEL : +44 (01625) 266358 - FAX : +44 (01625) 611913 - ICQ : 15776037
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"Rick [Kitty5]" wrote:
> 
> its a very complex csg (the bright green hides the detail unfortunatly) -
> takes a 6 hours with 1 point light, no aa (with case side detail its over a
> day)
> 
> with aa, 2 5x5 area lights, and the rad lighting it crawls...
> 

Hmm, if i have a look at a CD-Case it does not look that complicated to me
(apart from the Compact-disc logo, which could easily be done with a
heightfield)

It would probably be usefule to simplify it to some extend so it renders
faster, like you already said right now you don't see that much detail
anyway.

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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Rick [Kitty5] <ric### [at] kitty5com> wrote:
: This took 4days 19hours

  Radiosity is not the answer for everything. This image doesn't even look
like it benefits at all from radiosity. In fact, as you note as well, it
actually hides details, instead of enhancing them.

  With no radiosity and a proper area light this would probably render in
less than 10 minutes and could look at least as good, if not even better.

-- 
#macro N(D,I)#if(I<6)cylinder{M()#local D[I]=div(D[I],104);M().5,2pigment{
rgb M()}}N(D,(D[I]>99?I:I+1))#end#end#macro M()<mod(D[I],13)-6,mod(div(D[I
],13),8)-3,10>#end blob{N(array[6]{11117333955,
7382340,3358,3900569407,970,4254934330},0)}//                     - Warp -

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>   With no radiosity and a proper area light this would probably render in
> less than 10 minutes and could look at least as good, if not even better.

as I stated - 6 hours with one point light.

area lights are crippling, and the rad makes a huge difference, the rad
hides some of the detail as the green texture is to bright.


--
Rick

Kitty5 WebDesign - http://Kitty5.com
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> its a very complex csg (the bright green hides the detail unfortunatly) -

 Yes, I see it if I look closely. 
 
> with aa, 2 5x5 area lights, and the rad lighting it crawls...

  Not only this. You're using a damn slow combination: "area_light +
radiosity + transparency". Try a test with a opaque texture for the
plastic cover and you will see render time decrease. I've on my hands a
scene with radiosity and 3 huge arealights, and the it renders not too
bad until it reaches the first glass bottle. "Complicated CSG +
radiosity" seems to not have such a drastic effect on render times if
you don't make it transparent.

-- 
Jaime Vives Piqueres

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Jaime Vives Piqueres wrote:

>   Not only this. You're using a damn slow combination: "area_light +
> radiosity + transparency". Try a test with a opaque texture for the
> plastic cover and you will see render time decrease. I've on my hands a
> scene with radiosity and 3 huge arealights, and the it renders not too
> bad until it reaches the first glass bottle. "Complicated CSG +
> radiosity" seems to not have such a drastic effect on render times if
> you don't make it transparent.

I've noticed that too. Transparency is already very difficult to handle with
radiosity, but I've almost given up on using radiosity + transparency + ior. In
my IRTC "contrast" picture, I had to remove a few bottles because of that. In
another instance, 1 single bottle with ior made the render impossibly slow, and
not only when it reached the bottle. Just removing the ior made it...
acceptably slow.

G.
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Gilles Tran wrote:
> 
> I've noticed that too. Transparency is already very difficult to handle with
> radiosity, but I've almost given up on using radiosity + transparency + ior. In
> my IRTC "contrast" picture, I had to remove a few bottles because of that. In
> another instance, 1 single bottle with ior made the render impossibly slow, and
> not only when it reached the bottle. Just removing the ior made it...
> acceptably slow.
> 

Maybe a 'no_radiosity' flag would be useful, just like 'no_reflection' or
'no_image'.  There is not much point in calculating radiosity on a
completely transparent object anyway.  

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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