advertise

Go Back   CGFeedback > CG Forums > Technical Area

Technical Area Post your technical questions here.

Reply
 
Thread Tools Display Modes
Old 12-03-2010, 10:20 PM   #11
MikeANash
Senior Member
Points: 223,540, Level: 100 Points: 223,540, Level: 100 Points: 223,540, Level: 100
Activity: 0% Activity: 0% Activity: 0%
 
MikeANash's Avatar
 
Join Date: Feb 2010
Location: Australia, Brisbane
Posts: 280
Real Name: Mike Nash
Send a message via MSN to MikeANash
Default



Nice tips guys

Are the majority of you guys mapping a .hdri onto their environment slot for their reflections mat on the outside of the eye or just on the skylight itself ?

I always seem to get bad reflections from hdri's for some reason.
MikeANash is offline   Reply With Quote
Old 15-03-2010, 04:40 AM   #12
PaulAdams
Senior Member
Points: 9,968, Level: 66 Points: 9,968, Level: 66 Points: 9,968, Level: 66
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Dec 2009
Location: London, UK
Company: MPC
Posts: 100
Real Name: Paul Adams
Send a message via MSN to PaulAdams
Default

Okay, so along with the shader work how do you guys approach the placement of the eye.

Do you use a rule of thumb for the size of the iris/pupil when using spheres?

I also wonder about the direction - straight ahead always looks wrong and dead, so do you guys rotate them outward at all?
__________________
http://www.splitpoly.com
PaulAdams is offline   Reply With Quote
Old 16-03-2010, 06:29 PM   #13
migusan76
Senior Member
Points: 28,051, Level: 98 Points: 28,051, Level: 98 Points: 28,051, Level: 98
Activity: 0% Activity: 0% Activity: 0%
 
migusan76's Avatar
 
Join Date: Feb 2010
Location: Outer Space...
Company: America's Army
Posts: 240
Real Name: Miguel A Santiago Jr
Send a message via AIM to migusan76 Send a message via MSN to migusan76 Send a message via Yahoo to migusan76
Default

Here are some old renders of my eye setups. I go with the same style modeling setup like you guys. For the shading I'm using mental ray and a custom SSS shader I've developed for it. Awesome Thread!



__________________
DigiTecK3D - LinkedIn - Facebook - Twitter
migusan76 is offline   Reply With Quote
Old 16-03-2010, 07:30 PM   #14
BrettSinclair
Posting machine
Points: 60,809, Level: 100 Points: 60,809, Level: 100 Points: 60,809, Level: 100
Activity: 25% Activity: 25% Activity: 25%
 
BrettSinclair's Avatar
 
Join Date: Nov 2009
Location: South Africa
Company: Freelance modeler
Posts: 1,043
Real Name: Brett Sinclair
Default

I thought that by now I'd get a boo for not sharing the sss transparency setup:P. Heh. So heres the scene file without the textures, if anyone is interested..

Feel free to test it out. If you make changes for the better it would be cool too see what people do. Its a pretty simple setup at the moment.
Attached Files
File Type: zip EyeSSSTransparency2.zip (29.2 KB, 1107 views)
BrettSinclair is offline   Reply With Quote
Old 17-03-2010, 07:49 AM   #15
PascalR
Administrator
Points: 394,827, Level: 100 Points: 394,827, Level: 100 Points: 394,827, Level: 100
Activity: 50% Activity: 50% Activity: 50%
 
PascalR's Avatar
 
Join Date: Oct 2009
Location: Vancouver, Canada
Company: Industrial Light and Magic
Posts: 4,667
Real Name: Pascal Raimbault
Member Photo Albums
Default

Thanks for the file Brett, will definitely check it out
__________________
How to display full rez pictures within your post

Please attach an image (could be small) to your first post, so it displays as a thread thumbnail.

Make sure to post the references you've used if you're looking for hardcore feedback!

PascalR is offline   Reply With Quote
Old 18-04-2010, 01:19 PM   #16
gal
Junior Member
Points: 7,545, Level: 57 Points: 7,545, Level: 57 Points: 7,545, Level: 57
Activity: 0% Activity: 0% Activity: 0%
 
gal's Avatar
 
Join Date: Jan 2010
Location: Wellington,N.Z.
Company: weta digital
Posts: 21
Real Name: Gal
Default

superb thread..
i wanted to point something out not shader/render related but anatomy wise.

i have yet to figure out the correct size/placement/rotation of human eyes but i've done a lot of research on it. i wonder if any of you came to the same conclusions or different ones.

1. seems back of the eye(part facing the brain is squashed and the front as well by just a bit. not a sphere. though it doesnt impact much on the eye setup process.

2. the eyes arent spaced by an "eye" apart but it varies per person? can be from 0.9-1.8 eyes apart, can anyone confirm? meaning the eye size it self varies between people.

3. i read on medical journals the size of the eye cornea/iris can vary by 10% max in every human, meaning there is roughly a specific size that varies only a little bit. but no one seems to agree it's a fact anywhere.

4. if 3 is correct, is there a specific relationship between the iris scale and the eyeball? or does it also vary? how does that connect with 2 then..

5. the eyes are cross-eyed outwards, meaning looking at say mri shots from above you can see without a specific focus each eye is directed outwards
however, when look/talk to people they focus at us, meaning usually people eyes are focused on mid-close objects so they need to be cross-eyed towards not outwards..so how does that work with the natural eye location is outwards?

6. the eye in the eye socket and wrapped with the eye lids does not sit in the center, the iris/pupil seems to be in the center of the eyelids(from left to right) and looking straight the eyeball is exactly behind it centered. but it's not, the eye ball is actually cross-eyed outwards and down, the eyeball is sitting higher and inwards towards the nose so the iris/pupil is actually on the lower outwards off center of the eyeball(i mean the eyeball is rotated to that direction) . i found an old final fantasy wireframe done by..i forgot his name(great modeler).. showing this effect and i never noticed this before i did this research.

perhaps im crazy and eyes are straight but maybe some of these are correct? what do you guys think?
Attached Thumbnails
Click image for larger version

Name:	head-fig3.jpg
Views:	2107
Size:	40.5 KB
ID:	1331   Click image for larger version

Name:	eye_distance.jpg
Views:	1373
Size:	125.2 KB
ID:	1332  
__________________
www.galroiter.com

Last edited by gal; 18-04-2010 at 01:21 PM.
gal is offline   Reply With Quote
Old 03-06-2010, 12:07 AM   #17
BrettSinclair
Posting machine
Points: 60,809, Level: 100 Points: 60,809, Level: 100 Points: 60,809, Level: 100
Activity: 25% Activity: 25% Activity: 25%
 
BrettSinclair's Avatar
 
Join Date: Nov 2009
Location: South Africa
Company: Freelance modeler
Posts: 1,043
Real Name: Brett Sinclair
Default

@gal. Nice observations. I think you answered your own questions .

I'm trying too attach eyelashes too the eyelid for animation purposes in maya. I tried riveting the lashes on, which worked great. But when I finished the one eye lag was really bad and you couldn't really animate it that way.

Does anyone have any ideas of how too attach the lashes? I tried a wrap but it does some funky stuff:P.
BrettSinclair is offline   Reply With Quote
Old 26-07-2010, 07:44 PM   #18
arthurduque
Senior Member
Points: 6,504, Level: 52 Points: 6,504, Level: 52 Points: 6,504, Level: 52
Activity: 0% Activity: 0% Activity: 0%
 
arthurduque's Avatar
 
Join Date: Jul 2010
Posts: 104
Real Name: Arthur Duque
Default

Great Topic Very helpfull
__________________
ARTHUR´S BLOG
CGFB SKETCH BOOK
arthurduque is offline   Reply With Quote
Old 04-09-2010, 04:26 AM   #19
Tomala
Member
Points: 4,487, Level: 42 Points: 4,487, Level: 42 Points: 4,487, Level: 42
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: May 2010
Posts: 37
Real Name: Tomek Stefanski
Default

Gal in fact eye ball is about 2.5cm-2.8cm wide and the distance between centers of the irises is about 6.5 cm. What that mean is the distance between two eyeballs is for sure bigger than one eyeball
When You look at the "eye" you also include conjunctiva and outer eyelashes to overall eye shape and thats why many artists says that distance beetween "eyes" equal one eye, not eyeball.
Tomala is offline   Reply With Quote
Old 07-09-2010, 05:20 AM   #20
Neox
Member
Points: 1,365, Level: 20 Points: 1,365, Level: 20 Points: 1,365, Level: 20
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Apr 2010
Location: Berlin
Posts: 37
Real Name: Steffen Unger
Send a message via ICQ to Neox Send a message via Skype™ to Neox
Default

Sorry for digging out this old thread, but i've got a question, a rather strange one i guess.
Why is everyone, me including building the iris to be bent inwards? I can't remember when i started doing this but i guess its because i've seen good looking eyes a hell lot of time back, beeing built that way - or maybe it was a tutorial.
But looking at the actual eye anatomy in a lot of anatomical sheets lately i recognized that its actually bent outwards

who would have thought of that? i actually didn't!







i guess they cannot all be wrong, and while i don't have a medical anatomy book at hand i guess the results in there would be the same?
So why exactly do wo do it? Just because of the nice effect of light beeing caught on the cornea as a specular highlight and on the iris a more diffuse shading going on?

just wondering
Neox is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT +13. The time now is 02:26 PM.



Powered by vBulletin®
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.