Hello. This started off as an exercise in texturing, well it still is
really ( more tweaking needed ), and then along the way I decided to
play with radiosity. At the base of the apple, where it rests on a
pedestal, the shadowing is 'rippley' and non-uniform. Anyone have some
pointers for me to clear this up? I've just started to dabble with
radiosity, this being my first project and could greatly appreciate any
advice and suggestions for my shadow dilemma. I'm posting the settings I
used below. Thank you.   ;-]

KB-

global_settings {
assumed_gamma 2.2
radiosity {
brightness 7.0
count 250
distance_maximum 65
error_bound 0.33
gray_threshold 0.4
low_error_factor 0.8
minimum_reuse 0.015
nearest_count 7
recursion_limit 2
}
}//rendered at aa 0.1 depth of 6

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Attachments:
Download 'apple2.jpg' (16 KB)

Preview of image 'apple2.jpg'

Aside from still appearing a bit like wax fruit it looks great, one of
the best apples I think I've seen. Going to add a stem and a leaf or two
as well?
I'm at a loss as to what to suggest for more realism, except perhaps it
needs slight blemishing maybe; large darkened spots or lines (only
vaguely of course. Perhaps little sprinkly lighter spots as I've often
noticed on the peel skin. Hey, I haven't eaten an apple in years and
barely notice them at the store so I'm going on memory alone here.


bankspad wrote:
> 
> Hello. This started off as an exercise in texturing, well it still is
> really ( more tweaking needed ), and then along the way I decided to
> play with radiosity. At the base of the apple, where it rests on a
> pedestal, the shadowing is 'rippley' and non-uniform. Anyone have some
> pointers for me to clear this up? I've just started to dabble with
> radiosity, this being my first project and could greatly appreciate any
> advice and suggestions for my shadow dilemma. I'm posting the settings I
> used below. Thank you.   ;-]
> 
> KB-
> 
> global_settings {
> assumed_gamma 2.2
> radiosity {
> brightness 7.0
> count 250
> distance_maximum 65
> error_bound 0.33
> gray_threshold 0.4
> low_error_factor 0.8
> minimum_reuse 0.015
> nearest_count 7
> recursion_limit 2
> }
> }//rendered at aa 0.1 depth of 6
> 
>   ------------------------------------------------------------------------
>  [Image]

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 omniVERSE: beyond the universe
  http://members.aol.com/inversez/homepage.htm
 mailto:inv### [at] aolcom?Subject=PoV-News

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Bob Hughes wrote:

> Aside from still appearing a bit like wax fruit it looks great, one of
> the best apples I think I've seen. Going to add a stem and a leaf or two
> as well?
> I'm at a loss as to what to suggest for more realism, except perhaps it
> needs slight blemishing maybe; large darkened spots or lines (only
> vaguely of course. Perhaps little sprinkly lighter spots as I've often
> noticed on the peel skin. Hey, I haven't eaten an apple in years and
> barely notice them at the store so I'm going on memory alone here.
>

Thank you. I know it still looks like wax, but  I'm no where near close to being
done with the apple, lots of work and discovery left. I'm not striving for
realism as much as I am accuracy. An apple looks the way it does as a result of
several layers of pigmentation and texture.Yes, I'm going to add a stem and
leaf, and slices - and then start on the next layer dependant texture on the the
list ( I'm thinking carambola ).     ;-]

The 'head-scratcher' , and the reason for the post, was the problem with
shadowing. I  tried several diferent configs but didn't seem to be able to
affect the outcome very much. I know that the radiosity functioning in POV is
still experimental, but hopefully what's happening is my fault and can be
corrected.

KB-

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I see now. So sorry I didn't even mention anything about what you asked.
I was doing another whirlwind tour of this ng, like always :) and liked
the apple so I stopped and replied.
Your radiosity info there doesn't help much without knowing what scale
your scene is at. Is the apple 1 unit in radius for example. And what
distance is the camera from it. Both are important factors.
I'm guessing you may have too large a distance_maximum there though. You
might be getting radiosity "illumination" from so much of the
surroundings your apple is awash in it.


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 omniVERSE: beyond the universe
  http://members.aol.com/inversez/homepage.htm
 mailto:inv### [at] aolcom?Subject=PoV-News

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> Your radiosity info there doesn't help much without knowing what scale
> your scene is at. Is the apple 1 unit in radius for example. And what
> distance is the camera from it. Both are important factors.
> I'm guessing you may have too large a distance_maximum there though. You
> might be getting radiosity "illumination" from so much of the
> surroundings your apple is awash in it.

Ohhhhhhhhhhhh, ok - geez that makes complete sense. When I was reading the
docs I didn't realize that these factors were that important, thank you for
pointing out that they are. Now I will more accurately figure the
distance_maximum and give that a try. Thanks again for your time and
insight.  ;-]

KB-

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You were right. My distance_maximum was too high. It took some playing to
figure out how to calculate - but worth the effort. Thanks again Mr. Hughes.
;-]

KB-

bankspad wrote:

> > Your radiosity info there doesn't help much without knowing what scale
> > your scene is at. Is the apple 1 unit in radius for example. And what
> > distance is the camera from it. Both are important factors.
> > I'm guessing you may have too large a distance_maximum there though. You
> > might be getting radiosity "illumination" from so much of the
> > surroundings your apple is awash in it.
>
> Ohhhhhhhhhhhh, ok - geez that makes complete sense. When I was reading the
> docs I didn't realize that these factors were that important, thank you for
> pointing out that they are. Now I will more accurately figure the
> distance_maximum and give that a try. Thanks again for your time and
> insight.  ;-]
>
> KB-

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Glad to have been of some help. Hope you get a good image done with that
apple, btw, and can use it for the IRTC or someplace someday.


bankspad wrote:
> 
> You were right. My distance_maximum was too high. It took some playing to
> figure out how to calculate - but worth the effort. Thanks again Mr. Hughes.
> ;-]
> 
> KB-
> 
> bankspad wrote:
> 
> > > Your radiosity info there doesn't help much without knowing what scale
> > > your scene is at. Is the apple 1 unit in radius for example. And what
> > > distance is the camera from it. Both are important factors.
> > > I'm guessing you may have too large a distance_maximum there though. You
> > > might be getting radiosity "illumination" from so much of the
> > > surroundings your apple is awash in it.
> >
> > Ohhhhhhhhhhhh, ok - geez that makes complete sense. When I was reading the
> > docs I didn't realize that these factors were that important, thank you for
> > pointing out that they are. Now I will more accurately figure the
> > distance_maximum and give that a try. Thanks again for your time and
> > insight.  ;-]
> >
> > KB-

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 omniVERSE: beyond the universe
  http://members.aol.com/inversez/homepage.htm
 mailto:inv### [at] aolcom?Subject=PoV-News

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