HELP WANTED: texturing a diamond

[Magnus3D]

A diamond has no texture, it has a material with a proper ior value and dispersion to get those colorful rainbow effects you can see in that image. Caustics can sometimes be necessary but far from always for gemstones like that diamond. It's only if you wanna see the caustic patterns on a floor below or something. It's pretty cpu intensive tasks to calculate so it's safest to avoid that.

The ior value you need can you easily find if you google for it. The rest depends on what renderengine you plan on using so you have to figure that out for yourself or google some tutorials on the subject.

/ Magnus

[Reebie]

thanks that was of some help but i need more specifics like a tutorial of similar effects, and to do with maya =)

[Magnus3D]

You're welcome :) sorry i'm not a Maya user myself (yet) so i can't give you all the help you need to get started. But i went on a trip with google to see what's out there on the net about disperion and gemstone rendering with mental ray for Maya and to be honest i could not find alot of helpful info. :( as many Maya and mental ray users as there are in the world one would think they shared their knowledge more. Anyways.. back on topic again, i found this which could help you.

http://www.highend3d.com/maya/downloads/shaders/Diamond-Shader-with-ramp-chromatic-4731.html

Maybe there's something in this thread too..
http://forums.cgsociety.org/showthread.php?t=104578

Or you could just wait until some of all the Maya/mental ray guru's on the forum see your thread and jump in to give you real helpful help. :)

/ Magnus

[Reebie]

thanks for the highend3d link!

its almost exactly what i was looking for so i guess i'll take a look at the file and see how it was done ^^

[Magnus3D]

You're welcome Rebecca, and apologies for my late reply. But better late than never.. :)
Great to hear that the link contained almost all the help you needed, which brings me to my next question. Have you got any results from all this info yet ? perhaps something you can show ? :) i hope all went well for you.

Keep me posted

/ Magnus

[Reebie]

Not realy yet but my assignment's deadline is next week so yea i'll post up something soon =)

[Magnus3D]

Oh okies, i'm sure you can pull this one off somehow :) so i'm not worried. Plz post something after your deadline, i'd very much like to see your results. :)

/ Magnus

[Sleepius]

dont know if you already got it working or not, but what you want to use is a dialectric material. with that you can set up the index of refraction to that of a real diamond. i think its like 2.417 or something. not sure, just look it up on a hyper physics web site or something. Once you have the material applied then you can begin messing with caustics and photons with your lights. :-D

[Sailor13]

Not a Maya user either, but here's a thread (http://forums.luxology.com/discussion/topic.aspx?id=34034&show=diamonds) in the Luxology forum that could help you. The way it's done in modo (and LW I think) is to use air polys, that is the same mesh copied over itself and flipped. How to texture it is explained here (http://www.vertexmonkey.com/presets_natural.php) - download the presets and read the pdf. Hope you can translate to Maya.

[bonestructure]

This is a list I made a while back that I find useful

IOR
MATERIAL Index ------------------------------------- Vacuum ...................... 1.00000 (exactly)

Air.................... 1.00029
Acetone .....................1.36
Alcohol ..................... 1.329
Amorphous Selenium ..........2.92
Calspar1 .................... 1.66
Calspar2 .................... 1.486
Carbon Disulfide ............ 1.63
Chromium Oxide .............. 2.705
Copper Oxide ................ 2.705
Crown Glass ................. 1.52
Crystal ..................... 2.00
Diamond ..................... 2.417
Emerald ..................... 1.57
Ethyl Alcohol ............... 1.36
Flourite .................... 1.434
Fused Quartz ................ 1.46
Heaviest Flint Glass ........ 1.89
Heavy Flint Glass ........... 1.65
Glass ....................... 1.5
Ice ......................... 1.309
Iodine Crystal .............. 3.34
Lapis Lazuli ................ 1.61
Light Flint Glass ........... 1.575
Liquid Carbon Dioxide ....... 1.20
Polystyrene ................. 1.55
Quartz 1 .................... 1.644
Quartz 2 .................... 1.553
Ruby ........................ 1.77
Sapphire .................... 1.77
Sodium Chloride (Salt) 1 .... 1.544
Sodium Chloride (Salt) 2 .... 1.644
Sugar Solution (30%) ........ 1.38
Sugar Solution (80%) ........ 1.49
Topaz ....................... 1.61
Water (20 C) ................ 1.333
Zinc Crown Glass ............ 1.517
Air..........................1.0008
Glass, soda-lime.............1.510

Acetone 1.36
Actinolite 1.618
Agalmatoite 1.550
Agate 1.544
Agate, Moss 1.540
Air 1.0002926
Alcohol 1.329
Alexandrite 1.745
Aluminum 1.44
Amber 1.546
Amblygonite 1.611
Amethyst 1.544
Anatase 2.490
Andalusite 1.641
Anhydrite 1.571
Apatite 1.632
Apophyllite 1.536
Aquamarine 1.577
Aragonite 1.530
Argon 1.000281
Asphalt 1.635
Augelite 1.574
Axinite 1.675
Azurite 1.730
Barite 1.636
Barytocalcite 1.684
Benitoite 1.757
Benzene 1.501
Beryl 1.577
Beryllonite 1.553
Brazilianite 1.603
Bromine (liq) 1.661
Bronze 1.18
Brownite 1.567
Calcite 1.486
Calspar 1.486
Cancrinite 1.491
Carbon Dioxide (gas) 1.000449
Carbon Disulfide 1.628
Carbon Tetrachloride 1.460
Cassiterite 1.997
Celestite 1.622
Cerussite 1.804
Ceylanite 1.770
Chalcedony 1.530
Chalk 1.510
Chalybite 1.630
Chlorine (gas) 1.000768
Chlorine (liq) 1.385
Chrome Green 2.4
Chrome Red 2.42
Chrome Yellow 2.31
Chromium 2.97
Chrysoberyl 1.745
Chrysocolla 1.500
Chrysoprase 1.534
Citrine 1.550
Clinozoisite 1.724
Cobalt Blue 1.74
Cobalt Green 1.97
Cobalt Violet 1.71
Colemanite 1.586
Copper 1.10
Copper Oxide 2.705
Coral 1.486
Cordierite 1.540
Corundum 1.766
Crocoite 2.310
Crystal 2.00
Cuprite 2.850
Danburite 1.633
Diamond 2.417
Diopside 1.680
Dolomite 1.503
Dumortierite 1.686
Ebonite 1.66
Ekanite 1.600
Elaeolite 1.532
Emerald 1.576
Emerald, Synth flux 1.561
Emerald, Synth hydro 1.568
Enstatite 1.663
Epidote 1.733
Ethanol 1.36
Ethyl Alcohol 1.36
Euclase 1.652
Fabulite 2.409
Feldspar, Adventurine 1.532
Feldspar, Albite 1.525
Feldspar, Amazonite 1.525
Feldspar, Labradorite 1.565
Feldspar, Microcline 1.525
Feldspar, Oligoclase 1.539
Feldspar, Orthoclase 1.525
Fluoride 1.56
Fluorite 1.434
Formica 1.47
Garnet, Almandine 1.760
Garnet, Almandite 1.790
Garnet, Andradite 1.820
Garnet, Demantoid 1.880
Garnet, Grossular 1.738
Garnet, Hessonite 1.745
Garnet, Rhodolite 1.760
Garnet, Spessartite 1.810
Gaylussite 1.517
Glass 1.51714
Glass, Albite 1.4890
Glass, Crown 1.520
Glass, Crown, Zinc 1.517
Glass, Flint, Dense 1.66
Glass, Flint, Heaviest 1.89
Glass, Flint, Heavy 1.65548
Glass, Flint, Lanthanum 1.80
Glass, Flint, Light 1.58038
Glass, Flint, Medium 1.62725
Glycerine 1.473
Gold 0.47
Hambergite 1.559
Hauynite 1.502
Helium 1.000036
Hematite 2.940
Hemimorphite 1.614
Hiddenite 1.655
Howlite 1.586
Hydrogen (gas) 1.000140
Hydrogen (liq) 1.0974
Hypersthene 1.670
Ice 1.309
Idocrase 1.713
Iodine Crystal 3.34
Iolite 1.548
Iron 1.51
Ivory 1.540
Jade, Nephrite 1.610
Jadeite 1.665
Jasper 1.540
Jet 1.660
Kornerupine 1.665
Kunzite 1.655
Kyanite 1.715
Lapis Gem 1.500
Lapis Lazuli 1.61
Lazulite 1.615
Lead 2.01
Leucite 1.509
Magnesite 1.515
Malachite 1.655
Meerschaum 1.530
Mercury (liq) 1.62
Methanol 1.329
Moldavite 1.500
Moonstone, Adularia 1.525
Moonstone, Albite 1.535
Natrolite 1.480
Nephrite 1.600
Nitrogen (gas) 1.000297
Nitrogen (liq) 1.2053
Nylon 1.53
Obsidian 1.489
Olivine 1.670
Onyx 1.486
Opal 1.450
Oxygen (gas) 1.000276
Oxygen (liq) 1.221
Painite 1.787
Pearl 1.530
Periclase 1.740
Peridot 1.654
Peristerite 1.525
Petalite 1.502
Phenakite 1.650
Phosgenite 2.117
Plastic 1.460
Plexiglas 1.50
Polystyrene 1.55
Prase 1.540
Prasiolite 1.540
Prehnite 1.610
Proustite 2.790
Purpurite 1.840
Pyrite 1.810
Pyrope 1.740
Quartz 1.544
Quartz, Fused 1.45843
Rhodizite 1.690
Rhodochrisite 1.600
Rhodonite 1.735
Rock Salt 1.544
Rubber, Natural 1.5191
Ruby 1.760
Rutile 2.62
Sanidine 1.522
Sapphire 1.760
Scapolite 1.540
Scapolite, Yellow 1.555
Scheelite 1.920
Selenium, Amorphous 2.92
Serpentine 1.560
Shell 1.530
Silicon 4.24
Sillimanite 1.658
Silver 0.18
Sinhalite 1.699
Smaragdite 1.608
Smithsonite 1.621
Sodalite 1.483
Sodium Chloride 1.544
Sphalerite 2.368
Sphene 1.885
Spinel 1.712
Spodumene 1.650
Staurolite 1.739
Steatite 1.539
Steel 2.50
Stichtite 1.520
Strontium Titanate 2.410
Styrofoam 1.595
Sulphur 1.960
Synthetic Spinel 1.730
Taaffeite 1.720
Tantalite 2.240
Tanzanite 1.691
Teflon 1.35
Thomsonite 1.530
Tiger eye 1.544
Topaz 1.620
Topaz, Blue 1.610
Topaz, Pink 1.620
Topaz, White 1.630
Topaz, Yellow 1.620
Tourmaline 1.624
Tremolite 1.600
Tugtupite 1.496
Turpentine 1.472
Turquoise 1.610
Ulexite 1.490
Uvarovite 1.870
Variscite 1.550
Vivianite 1.580
Wardite 1.590
Water (gas) 1.000261
Water 100'C 1.31819
Water 20'C 1.33335
Water 35'C (Room temp) 1.33157
Willemite 1.690
Witherite 1.532
Wulfenite 2.300
Zincite 2.010
Zircon, High 1.960
Zircon, Low 1.800
Zirconia, Cubic 2.170

[VazeWare]

You're welcome :) sorry i'm not a Maya user myself (yet) so i can't give you all the help you need to get started. But i went on a trip with google to see what's out there on the net about disperion and gemstone rendering with mental ray for Maya and to be honest i could not find alot of helpful info. :( as many Maya and mental ray users as there are in the world one would think they shared their knowledge more. Anyways.. back on topic again, i found this which could help you.

http://www.highend3d.com/maya/downloads/shaders/Diamond-Shader-with-ramp-chromatic-4731.html

Maybe there's something in this thread too..
http://forums.cgsociety.org/showthread.php?t=104578

Or you could just wait until some of all the Maya/mental ray guru's on the forum see your thread and jump in to give you real helpful help. :)

/ Magnus

Thank you, too.

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