Comments on: Eye and hair test http://www.sintel.org/news/eye-and-hair-test/ Sintel, the Durian Open Movie Project Sat, 04 Feb 2012 06:26:07 +0000 hourly 1 http://wordpress.org/?v=3.0.3 By: alain http://www.sintel.org/news/eye-and-hair-test/comment-page-1/#comment-14639 alain Wed, 30 Jun 2010 20:07:22 +0000 http://durian.blender.org/?p=947#comment-14639 have to see if refraction for the iris will be necessary. If so the eyes will need to use raytraced transparency. Depending on the shot it might eat up more render time but I try to keep it as low as possible. So for the final animation the settings might differ from shot to shot. Though nothing is really final yet have to see if refraction for the iris will be necessary. If so the eyes will need to use raytraced transparency. Depending on the shot it might eat up more render time but I try to keep it as low as possible. So for the final animation the settings might differ from shot to shot. Though nothing is really final yet

]]> By: Bar Products http://www.sintel.org/news/eye-and-hair-test/comment-page-1/#comment-11969 Bar Products Sat, 05 Jun 2010 06:33:56 +0000 http://durian.blender.org/?p=947#comment-11969 Fantastic site, where did you come up with the information in this piece of content? I’m happy I found it though, ill be checking back soon to see what other articles you have. Fantastic site, where did you come up with the information in this piece of content? I’m happy I found it though, ill be checking back soon to see what other articles you have.

]]> By: Randell Buckman http://www.sintel.org/news/eye-and-hair-test/comment-page-1/#comment-6958 Randell Buckman Fri, 19 Feb 2010 00:31:21 +0000 http://durian.blender.org/?p=947#comment-6958 Hi just stumbled your site and been browsing around some of your posts and just wondering why you chose Wordpress site dont you find it hard to do anything with? Hi just stumbled your site and been browsing around some of your posts and just wondering why you chose WordPress site dont you find it hard to do anything with?

]]> By: rogper http://www.sintel.org/news/eye-and-hair-test/comment-page-1/#comment-2888 rogper Fri, 13 Nov 2009 19:06:16 +0000 http://durian.blender.org/?p=947#comment-2888 @soenke and D Thanks for the explanations! Very interesting indead. I've also googled a bit and noted that anatomically is perfect and that do are tutorials that also do it this way: http://medicalimages.allrefer.com/large/eye-anatomy.jpg http://www.forteach.net/graphicdesign/threed/28152.html I'll now have to think :) @soenke and D
Thanks for the explanations! Very interesting indead.
I’ve also googled a bit and noted that anatomically is perfect and that do are tutorials that also do it this way:
http://medicalimages.allrefer.com/large/eye-anatomy.jpg
http://www.forteach.net/graphicdesign/threed/28152.html

I’ll now have to think :)

]]> By: soenke http://www.sintel.org/news/eye-and-hair-test/comment-page-1/#comment-2874 soenke Fri, 13 Nov 2009 12:44:03 +0000 http://durian.blender.org/?p=947#comment-2874 Aaahh, I completely misunderstood you.. I guess it was too late and my english isn't very good anyway :D What you are referring to is the refraction of the light and yes, ior is the way to create such an effect in blender. The lighting of things through refraction is called caustics, which is a feature that isn't in blenders internal renderer. But with textures it should be possible to fake that effect. Actually in the model I posted the iris already has a simple texture which tries to mimic that effect. I have to see if refraction for the iris will be necessary. If so the eyes will need to use raytraced transparency. Depending on the shot it might eat up more render time but I try to keep it as low as possible. So for the final animation the settings might differ from shot to shot. Though nothing is really final yet... ;) Aaahh, I completely misunderstood you.. I guess it was too late and my english isn’t very good anyway :D
What you are referring to is the refraction of the light and yes, ior is the way to create such an effect in blender. The lighting of things through refraction is called caustics, which is a feature that isn’t in blenders internal renderer. But with textures it should be possible to fake that effect. Actually in the model I posted the iris already has a simple texture which tries to mimic that effect.
I have to see if refraction for the iris will be necessary. If so the eyes will need to use raytraced transparency. Depending on the shot it might eat up more render time but I try to keep it as low as possible. So for the final animation the settings might differ from shot to shot. Though nothing is really final yet… ;)

]]> By: D http://www.sintel.org/news/eye-and-hair-test/comment-page-1/#comment-2843 D Fri, 13 Nov 2009 03:18:17 +0000 http://durian.blender.org/?p=947#comment-2843 Blender can demonstrate this, too (IOR=1.38), but I can't get it to bend light so that it is lit realistically, also... :( Something to work on. http://i34.tinypic.com/9r2kpz.png Blender can demonstrate this, too (IOR=1.38), but I can’t get it to bend light so that it is lit realistically, also… :( Something to work on.
http://i34.tinypic.com/9r2kpz.png

]]> By: D http://www.sintel.org/news/eye-and-hair-test/comment-page-1/#comment-2840 D Fri, 13 Nov 2009 02:34:04 +0000 http://durian.blender.org/?p=947#comment-2840 Here it is! :D http://i35.tinypic.com/2lvit68.png Can you see it? Here it is! :D

http://i35.tinypic.com/2lvit68.png

Can you see it?

]]> By: D http://www.sintel.org/news/eye-and-hair-test/comment-page-1/#comment-2839 D Fri, 13 Nov 2009 02:04:17 +0000 http://durian.blender.org/?p=947#comment-2839 No no no! :D I wasn't trying to say the iris is outward at all! I was saying that the LIGHT is bent IN by the cornea TOWARDS the iris! Go up to one of your blue-eyed colleagues and ask him to stare straight ahead. Then move around him and see how the image of the iris DISTORTS as you come to his side. If the cornea in the image that I showed did not bend light, you would not be able to see the iris as you are seeing a flat plane at 180 degrees; but beause the cornea bends light, light bouncing from the iris is bent towards you when it exits through the clear part of the cornea that you should have been seeing right through, so that you can see the iris though distorted through the shape of the cornea. This shape just so happens to bend more light from the other side of the iris than the side closer to you. Let me draw you a ray diagram... No no no! :D I wasn’t trying to say the iris is outward at all!

I was saying that the LIGHT is bent IN by the cornea TOWARDS the iris!

Go up to one of your blue-eyed colleagues and ask him to stare straight ahead. Then move around him and see how the image of the iris DISTORTS as you come to his side.
If the cornea in the image that I showed did not bend light, you would not be able to see the iris as you are seeing a flat plane at 180 degrees; but beause the cornea bends light, light bouncing from the iris is bent towards you when it exits through the clear part of the cornea that you should have been seeing right through, so that you can see the iris though distorted through the shape of the cornea. This shape just so happens to bend more light from the other side of the iris than the side closer to you.

Let me draw you a ray diagram…

]]> By: soenke http://www.sintel.org/news/eye-and-hair-test/comment-page-1/#comment-2832 soenke Fri, 13 Nov 2009 00:26:05 +0000 http://durian.blender.org/?p=947#comment-2832 >D An iris being bend inwards would indeed explain the light play, but doing a google image search for "eye anatomy" spits out a lot of pictures of eyes with an iris bend outwards or being flat. And about your picture, I'm not quite sure if the hole iris is bend in or if it's just the very near area around the pupil. To me the main part of the iris looks flat in your picture. Looking at my own eye doesn't seem to reveal an inward iris, but I have to admit that it's hard to tell because of the refractions. Personally I think the rendered results with an outward iris seem more appealing, but we will probably discuss this issue in the team. Thank you for your input, it made me think more about it :) >ward :) >D
An iris being bend inwards would indeed explain the light play, but doing a google image search for “eye anatomy” spits out a lot of pictures of eyes with an iris bend outwards or being flat.
And about your picture, I’m not quite sure if the hole iris is bend in or if it’s just the very near area around the pupil. To me the main part of the iris looks flat in your picture.
Looking at my own eye doesn’t seem to reveal an inward iris, but I have to admit that it’s hard to tell because of the refractions.
Personally I think the rendered results with an outward iris seem more appealing, but we will probably discuss this issue in the team. Thank you for your input, it made me think more about it :)

>ward
:)

]]> By: ward http://www.sintel.org/news/eye-and-hair-test/comment-page-1/#comment-2810 ward Thu, 12 Nov 2009 16:04:15 +0000 http://durian.blender.org/?p=947#comment-2810 that eye is fantastic!! that eye is fantastic!!

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