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Ice Glaciers and Frozen Water
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These pages are a copy of the official truespace forums prior to their removal somewhere around 2011.
They are retained here for archive purposes only.
Ice Glaciers and Frozen Water // Roundtable
Post by robert // Aug 27, 2008, 2:59pm
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robert
Total Posts: 609
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Now I'm wondering about ice. In the image below I tired to capture the imperfections in the ice as the water freezes. Since I can't search the forums for "ice" because it's only three letters I was hoping to see if anyone new how to make a believable ice material, whether with fresnal or without, and possibly extend that to glacier ice which actually turns blue when thick enough due to it's nature and light passing through. If anyone has used ice before and believes they know how to successfully accomplish either the imperfections, the ice itself, or glacier like consistency that would be helpful. I'm wondering about this and clouds because a 2D animation I made has both in the first scene and I was planning on making the 2D animation 3D. If anyone is wondering what exactly I'm going for I have the animation on my Facebook and will be putting it on my SkyDrive located at http://cid-4b84307a9f95b1b7.skydrive.live.com/browse.aspx/Public?lc=1033 (it's a rar file so if you don't have winrar you need to get it). |
Post by jamesmc // Aug 27, 2008, 4:11pm
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jamesmc
Total Posts: 2566
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I really like the ice crystal effect you did.
This is an ice cube I did awhile back. Just uses a fractal cloud bump on the cube of ice, glass shader and tint of blue. |
Post by Liger ZERO // Aug 27, 2008, 4:25pm
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Liger ZERO
Total Posts: 124
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I have not tried to make a glacier before but last year I went to Alaska. After seeing what the ice looks like there you might want to try more of a SSS look. The glaciers don't look vary transparent there more translucent. Maybe some of the other people can give you a little better advice on what to do.
Here is a pic I took of a piece of ice from one of the glacier. Hope it helps. |
Post by robert // Aug 27, 2008, 4:51pm
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robert
Total Posts: 609
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Thanks james I am also wondering about regular ice and the bump map does add another level of realism.
@ Liger: I googled some pics as well, but I think yours is probably most helpful. What I was thinking is that I make two objects, one outer white one with a cloud displacement map to get the "dents" in the snow layer. Take that object and subtract the "blue" part and then have the "blue" object with some SSS with the snow layer sitting on top. It's rather difficult to explain, if you aren't quite sure what I mean I can upload a photo showing what I mean. |
Post by Liger ZERO // Aug 27, 2008, 5:04pm
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Liger ZERO
Total Posts: 124
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Sounds like a good idea robert. Please share the results you get.:) |
Post by jamesmc // Aug 27, 2008, 5:08pm
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jamesmc
Total Posts: 2566
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Same ice cube shader, but added a shiny white stone shader to a second layer. Soft painted plane and primitive cubes all with same same shader, default lighting, lightworks. |
Post by jamesmc // Aug 27, 2008, 5:35pm
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jamesmc
Total Posts: 2566
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Texture clipped out of Liger Zero's glacier photo and applied with glass shader and texture bump map layer/with photo texture. Quickies of course, no retouching. Would be better with a normal map and more scene preparation. |
Post by transient // Aug 27, 2008, 7:57pm
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transient
Total Posts: 977
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Here (http://www.dareoner.com/TUTO-ice.htm) is a decent tute on creating realistic ice. Someone in the old truespace forums used this method with lightworks and shadermagic (the digital glazier shader if I remember correctly).
You could probably use vray to create something similar. |
Post by TomG // Aug 28, 2008, 1:12am
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TomG
Total Posts: 3397
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Some surface scattering might work well for the glacier ice, where light goes in the surface and back out again, for that translucent look.
HTH!
Tom |
Post by robert // Aug 29, 2008, 12:51pm
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robert
Total Posts: 609
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Transient, that link you supplied I can't access for some reason, although I remember finding that before, it was for 3ds Max if I recall correctly, although the values should transfer to tS well. I managed to keep the bump map used there and applied it here.
The two images below are of an ice cube, one with and one without internal fractures, and I decided to go with the Glossy shader instead of the Fresnalian for material because normal ice is very rarely clear.
I also have the material settings I used to create the ice and the internal fractures attached.
The fractures themselves were created by making a smaller object inside of the original, not necessarily a scaled copy, then using the hair tool to get the little spikey bits that come off the main body. Another method could be subtracting small bits out of the middle portions, since this is what it is in real life it should also produce good results, although I think this method would be much more time consuming to model. I used only 250 "hairs" and I don't think that that is actually enough, but this is just illustration of concept I guess.
I actually used a regular phong material with max specularity and max diffusion for the individual spikes because as noted below it would take too long otherwise.
Note: when including fractures render time will increase (for me about 200 - 300%), if you want each individual hair to have some form of transparency and still want to use Global Illumination, then you better have a render farm because if you have enough “hairs” with transparency render time can increase by over 10,000% for a mere 500 hairs or less.:(
This phenomenon does actually happen btw, although it'll probably look completely different. Next time you freeze a water bottle look at the ice inside, or look at an ice cube and you'll see it.;)
I would be rather glad if anyone managed to find flaws and ways of possibly correcting them.
Next one to work on: the glacier, which shouldn't be so render intesive.:cool:
P.S. Sorry about funky image sizes and such, but I had to make it attachable. |
Post by Liger ZERO // Aug 29, 2008, 2:51pm
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Liger ZERO
Total Posts: 124
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Vary Cool.;) lol |
Post by robert // Aug 29, 2008, 4:10pm
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robert
Total Posts: 609
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Here is the glacier. Terrible model I know, but I think the textures are all right, you'll probably have to modify values based on your lighting configuration. Let me know where I can improve!:jumpy: |
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