Diamonds are forever...


(S68) #1

… in the sense they take forever to render!

45h 32m!!! I won’t pursue this line any further :frowning:

10Mphotons and much clustering yet you can still see granularity for the extremely high number of internal reflections :frowning:

http://www.selleri.org/Blender/images/diamante3.jpg

And, for those of you who use lightflow, here are th IOR of
various substances :slight_smile:

Comments?

Stefano

MATERIAL Index
-------------------------------------
Vacuum … 1.00000 (exactly)

Air (STP).................... 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

(SKPjason) #2

Truly beautiful… a subtle twinkling and robust blooming of color among the facets… simply amazing. The way the light dances across the scene… I swear I saw a sparkling twinkle swim across my computer monitor…

Truly a masterpiece in light and form. Great job.

Jason ;D


(wewa_juicyb) #3

That’s a VERY confusing picture… apart from the confusion it’s wonderful. All the reflections, refraction, caustics(?), etc. Really nice. I might suggest redering it from a different angle to avoid that one face that is reflecting almost completely. Also maybe the diamond should have a shadow…
Adues,
WeWa
hmmm, this sounds awefully negative, don’t get me wrong, it’s a beautiful picture.


(rixtr66) #4

very cool!looks like it took awhile.

whats next??:slight_smile:

rixtr


(valarking) #5

it’s very cool and detailed, but i think you went a bit overboard on some of the raytracing, thus making it a bit confusing. the shape is hard to recognize.


(stephen2002) #6

it looks real exept for that big, white face right in the center. It looks like a random face that is sticking off at a strange angle.

And it does look like it took a LONG time to render.


(S68) #7

Thanx for comments :slight_smile:

That reflecting face is difficult to get rid of.

Diamonds are actually faceted so that they cast back as much light as possible and refract back what is not reflected.

So it is very difficult to place lights so that no face specularly reflects.

Actually I’m discontent of two things:

1 - The blue inside. I must have given the back faces a wrong angle because light is supposed to get completely trapped ad go back, hence the background color should not show. there must be some mistakes. I must find correct angles somewhere.

2 - Refraction separate colors. White light gets separatewd into its rainbow component and red is refracted more than violet (or vice versa :slight_smile: ) THis implies that scattered light, expecially from such a high IOR material as diamond should present many colors!

I think lightflow don’t handle refraction at this level of detail :frowning:

Stefano


(blengine) #8

wow, awesome…but very weird, i cant fer the life of me make out any shape of the diamond… =) that one big white square is throwing me off a bit …lots of cool refract/reflections