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cresshead
11-05-2008, 03:14 AM
hi

i'm lookig to create an object and want to to look like it's been carved from ice so is there any handy ice shader presets laying around for us to tryout?

also snow too

i suspect that many people in the coming weeks will be on the lookout or start to create some seasonal shaders for various projects:thumbsup:

something similar to this photo
http://www.icesculpture.co.uk/static_images/Ice-Sculptures-20.JPG

cheers!

steve g

Stooch
11-05-2008, 03:25 AM
use a dielectric shader with caustics and a crumple bump map. it helps to create the ice as a subdivided mesh with a displacement to give more surface irregularity. I was able to pull this off with lightwave 8 layer shaders using fresnel curves on reflectivity, transparency, spec and diffuse. You are essentially making a glass shader.

dont forget to account for air to ice transition if you are using straight shaders. This includes any bump textures (air medium would require an inverted bump).

Caustics and refraction play a big role.

http://www.stooch.net/ssp_director/albums/album-2/lg/bovis-test10.jpg

-EsHrA-
11-05-2008, 05:12 AM
well, there's this :

http://www.spinquad.com/forums/showthread.php?t=8154

and

http://www.newtek.com/forums/showthread.php?t=60418&page=3

prometheus
11-05-2008, 09:33 AM
donno..havenīt played with the nodes for quite some time now, but I was thinking..a dielectric material mixed with some subscurface scattering material perhaps, but it depends on, Ice can be either clear as in that image or it can turn thicker bluish white.

ice image maps for cracks on the refraction or bump channel?

Michael

JeffrySG
11-05-2008, 09:50 AM
Ice has an IOR of 1.309 if you need it...

This would be a cool little challenge. To see who could come up with the best Ice shader.

Here are a ton of images as well (http://www.flickr.com/search/show/with/75326309/?page=2&q=ice+sculpture&ss=2&ct=6)... it can look very different in dif. situations.

JeffrySG
11-05-2008, 09:56 AM
Also, my guess is that the photo you posted is not really ice. Most photography studios use plexi-glass or glass for props for photo-shoots. Under the hot lights most things melt pretty quickly.

Plexi-glass is around 1.5 IOR
and Lucite is around 1.495 IOR

cresshead
11-05-2008, 10:36 AM
actually that's an ice sculpture...i googled "ice scuptures">>

http://www.icesculpture.co.uk/ice-sculptures-film-and-ads.html
http://www.icesculpture.co.uk/static_images/Ice-Sculptures-6.JPG

http://www.icesculpture.co.uk/static_images/Ice-Sculptures-15.JPG

JeffrySG
11-05-2008, 12:22 PM
Is this close to what you were looking for?

65598

benhaines
11-05-2008, 01:46 PM
Ahem... just in case Jeff is too modest to show off his own work.

Ice Shader for everyone :)

http://www.presetcentral.com/preset/331/

Jeff, thanks for sharing. Great job!

JeffrySG
11-05-2008, 01:56 PM
Thx Ben!

cresshead
11-05-2008, 05:48 PM
ohh!

thank you!
i'll be playing with this wee beastie over the weekend!

lightwave community ROCKS!
:lightwave::bowdown:

:cat:

Hopper
11-05-2008, 05:52 PM
Wow .. that's spot on. Nice work Jeff. :thumbsup:

JeffrySG
11-05-2008, 07:18 PM
No problem guys! Let me know how it works out, cresshead. :)

prometheus
11-06-2008, 10:42 AM
donīt forget the environment, a good hdr probe image for highlighting reflections in the ice would probably be good.

Not sure If there is any use or need for plugin in an image map or procedural also in the refraction index,to it kinda breaks the lightrefraction in a bump way..not sure thou?

I will try and test on this preset.
and subsurface scattering inside..for thicker ice perhaps..If one takes a look at bigger Ice pieces or thicker blocks..the refraction or light scattering becomes less clear

Michael

benhaines
11-07-2008, 05:53 AM
Shameless promotion... I'm sorry. But it is on topic :)

ByteHawk has kindly shared his ice shader including files.

http://www.presetcentral.com/preset/332/

cresshead
11-07-2008, 06:05 AM
getting it now!

cheers

steve g

Bytehawk
11-07-2008, 08:09 AM
Glad to be of help.

one more tip : use a procedural displacement on a heavily subdivided, tripled object (not subd!!)to get a faceted look

Cageman
11-07-2008, 10:14 AM
Ahem... just in case Jeff is too modest to show off his own work.

Ice Shader for everyone :)

http://www.presetcentral.com/preset/331/

Jeff, thanks for sharing. Great job!

Wow... looks wonderful! :)

Thanks Jeff! :thumbsup:

JeffrySG
11-08-2008, 04:20 PM
Wow... looks wonderful! :)

Thanks Jeff! :thumbsup:

My pleasure, Cageman! Bytehawk's ice shader looks really great too! Make sure you have a look at that one too. :)

Cageman
11-09-2008, 10:13 PM
My pleasure, Cageman! Bytehawk's ice shader looks really great too! Make sure you have a look at that one too. :)

Ahh... missed that one! Looks great too!

Bytehawk: Good work! :)