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HDRI reflections
show user profile  9krausec
So, here is the deal, I want to make some HDRI reflections! Now, I have been looking for a tutorial on how to do so, but I cannot find anything specifically on reflections (HDR photography yes, but the HDRI reflections no)..

If someone would be so nice as to explain to me what I need to do with my DSLR to take some of these photos (I remember something with a ceramic chrome ball), I will post them all up on the forum for downloading (everyone likes free reflections!).

So, anyone game to help out a rook?




- Portfolio-




read 638 times
9/21/2011 5:30:41 PM (last edit: 9/21/2011 5:30:41 PM)
show user profile  Westcoast13
Googled and this came up...
http://www.ruffstuffcg.com/journal/making-mirrored-ball-and-panoramic-hdr-images-part-1.html



My Turbosquid Area

read 631 times
9/21/2011 5:33:44 PM (last edit: 9/21/2011 5:33:44 PM)
show user profile  9krausec
Just what I was looking for! Thanks Westcoast, I feel like a turd now...

edit: Do you recommend any file sharing sites that I can use to upload my future HDRI reflections onto maxforums for the community?




- Portfolio-




read 624 times
9/21/2011 5:55:05 PM (last edit: 9/21/2011 5:55:56 PM)
show user profile  mrgrotey
divshare :)




read 618 times
9/21/2011 5:57:15 PM (last edit: 9/21/2011 5:57:15 PM)
show user profile  Westcoast13
No problemo mate!

Looking forward to rendering some stuff with your homemade hdri's! :)


My Turbosquid Area

read 614 times
9/21/2011 6:02:27 PM (last edit: 9/21/2011 6:02:27 PM)
show user profile  9krausec
so a 12 inch mirror ball costs 50 dollars, but an 8 incher costs only 30... Will the 12" produce that much better quality shots than the 8"?

50 dollars is some money for a balll, I didn't realize they were that expensive (still going to buy one though).




- Portfolio-




read 607 times
9/21/2011 6:21:42 PM (last edit: 9/21/2011 6:21:42 PM)
show user profile  Boing
Can you not just rent a fish eye lens and take the same kind of shot?
read 603 times
9/21/2011 6:32:29 PM (last edit: 9/21/2011 6:32:29 PM)
show user profile  9krausec
I'm sure that it would be more cost effective to just buy a ball... I don't think any place near me would let me rent out a fish eye lens for less than 50 dollars.




- Portfolio-




read 595 times
9/21/2011 6:53:03 PM (last edit: 9/21/2011 6:53:03 PM)
show user profile  mike_renouf
http://www.amazon.com/gp/aw/d/B001MQ7TKK/ref=mp_s_a_4?qid=1316625180&sr=8-4

I've seen people use Christmas decorations too. If it's just reflections you're after I guess they can be a bit blurry without wrecking your scene. An actual environment background would need to be sharper.




read 588 times
9/21/2011 7:14:11 PM (last edit: 9/21/2011 7:14:11 PM)
show user profile  Davious
I used a 4 inch Christmas decoration once, it was plastic and scratched but gave me what I needed :)
8 inch is plenty big enough

EDIT :

On the subject, maybe a noob question but why can't you just take one pic of the ball and use PS to get the different exposure levels? My mid range digital camera does have a manual setting but I can't get the stops accurately

" Difficult, yes. Impossible , no..."
read 579 times
9/21/2011 8:21:29 PM (last edit: 9/21/2011 9:55:43 PM)
show user profile  Boing
It would be more pricey but you wouldn't have to deal with your own reflections and can get higher res images for use as environments.
read 543 times
9/22/2011 11:45:18 AM (last edit: 9/22/2011 11:45:18 AM)
show user profile  mrgrotey
Why on earth would having a bigger ball not leave you to deal with your own reflections?

[edit] oh sorry you were talking about using a fisheye, ignore me :)




read 540 times
9/22/2011 11:46:45 AM (last edit: 9/22/2011 11:48:40 AM)
show user profile  ulisei
found this:
http://www.cgshelf.com/faking_hdr.php

for reflections only you can also create just an empty studio-lighting-setup scene
(with selfilluminated planes in it i.e.) and render it out as an panoramic .exr or .hdr



read 527 times
9/22/2011 2:56:05 PM (last edit: 9/22/2011 2:56:05 PM)
show user profile  9krausec
Ok, so I bought a large glass gazing ball and took 31 shots of it from lowest exposure to highest exposure settings (changing 1/3 a stop each time)..

My aperture was locked, however my wight balance was not (so I might just end up having to shoot all of these again with locked WB)..

But anyways, I am using Picturenaut 3.0 to create HDRIs. I am merging RAW image types together to do so. When I open up a single raw (or render out an HDRI image off of all 31 of the raw images), I get a weird resolution opening/output of 1336x3516 when the files dimensions are 5184x3456.. It chops a large chunk of the photo..

Why is it not opening up the whole photo may I ask? Thanks!




- Portfolio-




read 478 times
9/29/2011 12:03:54 AM (last edit: 9/29/2011 12:03:54 AM)
show user profile  Bolteon
use ptgui.


//edit

and you can rent a 8mm sigma lens for $40 for a 3 day weekend rental at most places. just gotta put down $2k of a deposit that you get back when you return the lens in one piece.

the 8mm takes near 180 deg vert and hor. you shoot 3 sets at 120 deg apart and then use ptgui to stitch and output a single lat/long hdr.

-Marko Mandaric



read 465 times
9/29/2011 1:15:09 AM (last edit: 9/29/2011 1:17:07 AM)
 
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