Samuel Benge wrote:

> Hello everyone. I've got hills of ice.... or something loosely
> resembling ice.
> 
> In one image no subsurface scattering is used. In the other image,
> lighting effects can be seen 'wrapping around' the hills.
> 
> Ice_hill_not.jpg took 26 seconds to render.
> Ice_hillSSS.jpg took 9 minutes, 45 seconds to render.
> 
> The SSS is a 'faked' version made in mlPOV and uses the projection
> pattern. Some artifacts can be seen if you look closely. For instance,
> at the bottom of the middle hill you can see horizontal lines caused by
> the ground plane, which is also included in the SSS evaluation. Also,
> lines following the contour of the tops of certain hills can be seen
> because of the low samples and high scattering values I used.
> 
> The SSS takes both light_sources into account, thus simulating light
> scattering from both the sun and background sky.
> 
> I should try this scene with media... or if somebody else wants to
> render it I can make the source code available.
> 
> Q's, C's?
> 

I hate to be critical, especially since I'm nowhere near your level,
but something about the SSS image says "small" to me, like the central
hummock is only a few centimeters across, like a dirty ice-cube.
At the risk of being wrong as usual, maybe the SSS
is a little overplayed?

Wonderful effect though.

-- 
Bill Hails

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Samuel Benge wrote:
>Hello everyone. I've got hills of ice.... or something loosely
>resembling ice.
>
>I should try this scene with media... or if somebody else wants to
>render it I can make the source code available.
>
>Q's, C's?
>
>--
>Samuel Benge
>

yes ... would love to see the source ...
been wanting to model some snow and ice and it's that time of year. ;)

-ts-

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bil### [at] europeyahoo-inccom news:3fcfc411@news.povray.org

> I hate to be critical, especially since I'm nowhere near your level,
> but something about the SSS image says "small" to me, like the central
> hummock is only a few centimeters across, like a dirty ice-cube.

Exacly, I had same fealing. My first reaction was - what a nice wax/plastic  
toy representing an mountaint.

-- 
#macro g(U,V)(.4*abs(sin(9*sqrt(pow(x-U,2)+pow(y-V,2))))*pow(1-min(1,(sqrt(
pow(x-U,2)+pow(y-V,2))*.3)),2)+.9)#end#macro p(c)#if(c>1)#local l=mod(c,100
);g(2*div(l,10)-8,2*mod(l,10)-8)*p(div(c,100))#else 1#end#end light_source{
y 2}sphere{z*20 9pigment{function{p(26252423)*p(36455644)*p(66656463)}}}//M

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I think it's beautiful.  You can make it look larger if you put some things
in the foreground and make the ground look more finely textured.  Also,
large, translucent ice formations look distinctly <a
href="http://aku-aku.com/images/antarctic/aa035.jpg">blue</a>.  Try adding
some color.

(<a
href="http://www.lakesuperiorphoto.com/upper%20peninsula%20winter/grand%20island%20fallen%20ice%20boulders.jpg">More</a>
<a
href="http://www.thefickeadventure.com/WorldTrip/NewZealand/WestCoast/BestCave.html">blue</a>
<a
href="http://www.losglaciares.com/en/parque/galeria/025.html">formations</a>,
<a href="http://www.photolib.noaa.gov/corps/corp2494.htm">another</a>)

It's not perfect but I think you knew that.

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Wow, a new dimension of realism for our renders :) I agree with some 
posters that could put some more objects in the foreground to emphasize the 
size of the glacier. Also try making it more blue!

George


On Thu, 04 Dec 2003 13:28:13 -0800, Samuel Benge <sbe### [at] hotmailcom> 
wrote:

> Hello everyone. I've got hills of ice.... or something loosely resembling 
> ice.
>
> In one image no subsurface scattering is used. In the other image, 
> lighting effects can be seen 'wrapping around' the hills.
>
> Ice_hill_not.jpg took 26 seconds to render.
> Ice_hillSSS.jpg took 9 minutes, 45 seconds to render.
>
> The SSS is a 'faked' version made in mlPOV and uses the projection 
> pattern. Some artifacts can be seen if you look closely. For instance, at 
> the bottom of the middle hill you can see horizontal lines caused by the 
> ground plane, which is also included in the SSS evaluation. Also, lines 
> following the contour of the tops of certain hills can be seen because of 
> the low samples and high scattering values I used.
>
> The SSS takes both light_sources into account, thus simulating light 
> scattering from both the sun and background sky.
>
> I should try this scene with media... or if somebody else wants to render 
> it I can make the source code available.
>
> Q's, C's?
>



-- 
Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/

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Thanks George. I did make it a little blue already, but it looks like I 
need to add more color still. Some more objects would help it.....  but 
the whole scene needs to be remodeled.

George Pantazopoulos wrote:

> 
> Wow, a new dimension of realism for our renders :) I agree with some 
> posters that could put some more objects in the foreground to emphasize 
> the size of the glacier. Also try making it more blue!
> 
> George
> 


-- 
Samuel Benge

stb### [at] hotmailcom
See my website@: http://www.goldrush.com/~abenge/Top/index.html

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Mack Tuesday wrote:

> I think it's beautiful. 


Thank you.

> You can make it look larger if you put some things
> in the foreground and make the ground look more finely textured.  Also,
> large, translucent ice formations look distinctly <snip>


Thanks for the reference. I think I'll go Googling to see what else I 
can find. My heightfields don't really lend a realistic appearance to 
the ice.... and I really need to fix the color.

 > It's not perfect but I think you knew that.

Yes, I do. The render was only made from my poor memory of what ice is 
really supposed to look like. If anything, it looks like salt crystals 
which have built up onto a pile of rocks... Or wax that was dripped onto 
something.


-- 
Samuel Benge

stb### [at] hotmailcom
See my website@: http://www.goldrush.com/~abenge/Top/index.html

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I'll make it available soon..... but you'll need mlPOV to use it. I 
still need to make the effect fall off more realistically. The pattern 
is only like a 'thick' diffuse which penetrates the surface of the object.

ts wrote:

> 
> yes ... would love to see the source ...
> been wanting to model some snow and ice and it's that time of year. ;)
> 
> -ts-
> 
> 


-- 
Samuel Benge

stb### [at] hotmailcom
See my website@: http://www.goldrush.com/~abenge/Top/index.html

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Bill Hails wrote:

> I hate to be critical,


No you don't.... or at least yout shouldn't. Critisicm in low levels can 
be a good thing.....

> especially since I'm nowhere near your level,


Now that's going too far :)


> but something about the SSS image says "small" to me, like the central
> hummock is only a few centimeters across, like a dirty ice-cube.
> At the risk of being wrong as usual, maybe the SSS
> is a little overplayed?


I overplayed it on purpose. By overusing it, I hope to figure how it 
might be used in more appropriate levels. The effect is still a work in 
progress, and it will be until I can work out the many, many bugs.

 
> Wonderful effect though.


Thanks!

-- 
Samuel Benge

stb### [at] hotmailcom
See my website@: http://www.goldrush.com/~abenge/Top/index.html

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looks awesom as is.

Samuel Benge wrote:
> Just a closeup render with higher SSS settings. Some incidental 
> striations are visible, and seem to resemble cracks in the ice.
> 
> Took 21 minutes, 25 seconds to render.
> 
> An animation of this might ruin the effect, but I'm thinking if the 
> angle of incidence(aoi) pattern were used, things might look more 
> believable.
> 
> 
> ------------------------------------------------------------------------
>

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